TM 3-4240-313-10 OPERATOR'S MANUAL SIMPLIFIED ...

TM 3-4240-313-10 

OPERATOR'S MANUAL 

SIMPLIFIED COLLECTIVE 

PROTECTION EQUIPMENT: M20A1 

(NSN 4240-01-330-7806) 

WARNING - This document contains export-controlled technical data whose export is 

restricted by the Army Export Control Act (Title 22, US C, Sec2751 et deq)or Executive 

Order 12470 Violation of these export laws are subject to severe criminal penalties. 

DISTRABUTION STATEMENT C Distribution authorized to U.S. Government agencies 

and their contractors to protect technical or operational information from automatic 

dissemination under the International Exchange Program or by other means. This 

determination was made on 13 Nov 1986. Other requests for this document will be 

referred to Technical Director, U S Army Edgewood Research, Development and 

Engineering Center ATTN SCBRD EN-V, Aberdeen Proving Ground MD 21010-5423. 

DESTRUCTION NOTICE - Destroy by any method that will prevent \ disclosure of 

contents or reconstruction of the document. 

HEADQUARTERS, DEPARTMENT OF THE ARMY 

17 NOVEMBER 1995


WARNING 

TOXIC HAZARD 

Decontaminate all contaminated equipment and personnel before erecting Simplified Collective 

Protection Equipment (SCPE). 

When erecting SCPE in a toxic environment, protective mask and clothing must be worn by all 

personnel until SCPE is deployed and operational. The level of protective clothing will be 

determined by the unit commander. 

When SCPE is deployed in a toxic environment, it may take up to 1-1/2 hours from time blower is 

turned on to purge liner of toxic vapors. Personnel who must enter SCPE during 1-1/2 hour 

purge time shall wear clean, uncontaminated protective clothing. Failure to do so could result in 

prolonged purge time and recontamination of personnel. 

Do not locate blower near an area where exhaust gasses are generated because filter will not 

remove carbon monoxide. 

NOISE HAZARD 

The blower operating noise may be hazardous to operator hearing. Hearing protection must be 

worn when remaining within 4 feet of blower in operation. 

INJURY HAZARD 

Three major components of SCPE weigh approximately 100 pounds each. Lifting and/or carrying 

can be accomplished by no fewer than two personnel. 

Improper lifting of PE top when erecting may cause back strain to personnel. To avoid back 

strain follow, proper lifting procedures. 

Sharp edges of the filter canister can cause injury to personnel. Use care when connecting or 

disconnecting air ducts to filter. 

Keep hands clear of leg hinges when erecting or striking protective entrance (PE). 

FIRE HAZARD 

Keep flame, spark and heat clear of SCPE. 

HIGH VOLTAGE 

High voltage exists in motor blower and recirculation filter. To prevent electrical shock ensure 

motor blower power switch is in off (down) position before connecting or disconnecting power 

cable. 

Disconnect power cable before performing any maintenance procedures. 

FIRST AID 

For first aid information, refer to FM 21-11. 

a/(b blank)


Technical Manual 

No. 34240-413-10 

OPERATOR'S MANUAL 

FOR 

HEADQUARTERS 

Department of the Army 

Washington, D.C., 17 November 1995 

SIMPLIFIED COLLECTIVE PROTECTION EQUIPMENT: M20A1 

(NSN 4240-01-330-7806) 

REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS 

You can help improve this manual. If you find any mistake or if you know of a way to 

improve the procedures, please let us know. Mail your letter or DA Form 2028 

(Recommended Changes to Publications and Blank Form) direct to: Technical Director, 

U.S. Army Edgewood Research, Development and Engineering Center, ATTN: SCBRD- 

ENL-V, Aberdeen Proving Ground, MD 21010-5423. A reply will be furnished to you. 

WARNING 

This document contains export-controlled technical data whose export is restricted by the Army 

Export Control Ac (Title 22, U.S.C., Sec 2751 et seq) or Executive Order 12470. Violation of these 

export laws are subject to severe criminal penalties. 

DISTRIBUTION STATEMENT C: Distribution authorized to U.S. Government agencies and their 

contractors to protect technical or operational information from automatic dissemination under 

the International Exchange Program or by other means. This determination was made on 13 Nov 

86. Other requests for this document will be referred to: Technical Director, U.S. Army 

Edgewood Research, Development and Engineering Center, ATTN: SCBRD-ENL-V, Aberdeen 

Proving Ground, MD 21010-5423. 

DESTRUCTION NOTICE Destroy by any method that will prevent disclosure of contents or 

reconstruction of the document. 

TABLE OF CONTENTS 

HOW TO USE THIS MANUAL ............................................................................................ 

Page 

iv 

CHAPTER 1 INTRODUCTION ................................................................................................................ 1-1 

Section I General Information ............................................................................................................ 1-1 

Section II Equipment Description and Data ......................................................................................... 1-3 

Section III Principles of Operation .................................................................................................. 1-10 

i


TABLE OF CONTENTS (CONT) 

Page 

CHAPTER 2 OPERATING INSTRUCTIONS ........................................................................................... 2-1 

Section I Description and Use of Operators Controls and Indicators ................................................... 2-2 

Section II Preventive Maintenance Checks and Services (PMCS) ...................................................... 2-5 

Section III Operation Under Usual Conditions ...................................................................................... 2-22 

Section IV Operation Under Unusual Conditions .................................................................................. 2-63 

CHAPTER 3 MAINTENANCE INSTRUCTIONS ...................................................................................... 3-1 

Section I Lubrication Instructions ....................................................................................................... 3-1 

Section II Troubleshooting Procedures ................................................................................................ 3-1 

Section III Maintenance Procedures .............................................................................................. 3-5 

APPENDIX A REFERENCES ................................................................................................................... A-1 

APPENDIX B COMPONENTS OF END ITEM AND BASIC ISSUE ITEMS UST ....................................... B-1 

APPENDIX C ADDITIONAL AUTHORIZATION UST (AAL) ............................................................................... C-1 

APPENDIX D EXPENDABLE AND DURABLE ITEMS LIST............................................................................... D-1 

ALPHABETICAL INDEX .....................................................................................................Index-1 

ii/(iii blank)


M20A1 Simplified Collective Protection Equipment 

1-0


CHAPTER 1 

INTRODUCTION 

Section I. GENERAL INFORMATION 

1-1. SCOPE. 

a. Type of Manual. This is the operator's manual for use with the M20A1 Simplified Collective Protection 

Equipment (SCPE). 

b. Equipment Name and Model Number. Simplified Collective Protection Equipment: M20Al 

c. Purpose of Equipment. The SCPE provides a clean-air shelter for use against chemical and biological warfare 

agents and radioactive particles. The SCPE is an inflatable shelter which allows personnel to perform duties without 

wearing individual protective equipment. 

d. Special Limitations. The M20A1 SCPE should be deployed in a structurally sound building. It MUST NOT be 

deployed outside, where it would be subject to wind, rain, solar heat loading, or direct contact with liquid agents. The 

SCPE does not provide: 

(1) Environmental control equipment (heating and cooling); however, interfaces are provided. 

(2) A portable source of electrical power (electrical generator). 

(3) NBC detection devices. 

(4) Protection from nuclear radiation, however, the SCPE does provide protection against radioactive 

particles. 

(5) Protection from carbon monoxide exhaust gasses. 

1-2. MAINTENANCE FORMS AND RECORDS. 

Department of the Army forms and procedures used for equipment maintenance will be those prescribed by DA 

PAM 738-750, The Army Maintenance Management System (TAMMS). 

1-3. DESTRUCTION OF ARMY MATERIEL TO PREVENT ENEMY USE. 

For SCPE destruction procedures to prevent enemy use, refer to TM 43)0002-31 Destruction of Chemical 

Weapons and Defense Equipment to Prevent Enemy Use. 

1-4. REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATION (EIR). 

If your SCPE needs improvement, let us know. Send us an EIR You, the user, are the only one who can tell us 

what you don't like about your equipment. Let us know why you don't like the design or performance. Put it on a 

Standard Form 368, Quality Deficiency Report. Mail it to us at Armament and Chemical Acquisition and Logistics 

Activity, ATTN: AMSTA-AR-QAW-A, Rock Island, IL 61299-6000. We will send you a reply. 

1-1


1-5. CORROSION PREVENTION AND CONTROL (CPC). 

a. Corrosion Prevention and Control (CPC) of Army material is a continuing concern. It is important that any 

corrosion problems with this item be reported so that the problem can be corrected and improvements can be made to 

prevent the problem in future items. 

b. While corrosion is typically associated with rusting of metals, it can also include deterioration of other materials 

such as rubber and plastic. Unusual cracking, softening, swelling, or breaking of these materials may be a corrosion 

problem. 

c. If a corrosion problem is identified, it can be reported using Standard Form 368. Use of key words such as 

"corrosion," "rust," "deterioration," or "cracking" will assure that the information is identified as a CPC problem. 

d. The Standard Form 368 should be submitted to: 

Director 

U.S. Army Armament and Chemical Acquisition and Logistics Activity 

ATTN: AMSTA-AR-QAW-A/ Customer Feedback Center 

Rock Island, Illinois 61299-6000 

1-6. NOMENCLATURE CROSS-REFERENCE LIST. 

Common Name 

Gage 

M20Al SCPE 

Official Nomenclature 

Differential Pressure Gage 

Simplified Collective Protection Equipment: M20Al 

1-7. LIST OF ABBREVIATIONS. 

A 

BTU 

cfm 

cm 

DOT 

ECU 

HSFC 

Hz 

iwg 

kg 

kw 

m 

NA 

NBC 

PE 

VAC 

VDC 

Ampere 

British Thermal Unit 

Cubic feet per minute 

Centimeter 

Department of Transportation 

Environmental Control Unit 

Hermetically Sealed Filter Canister 

Hertz 

Inches of water gage 

Kilogram 

Kilowatt 

Meter 

Not Applicable 

Nuclear, Biological, Chemical 

Pressurized Protective Entrance 

Volt Alternating Current 

Volt Directing Current 

1-2


Section II. EQUIPMENT DESCRIPTION 

1-8 EQUIPMENT CHARACTERISTICS, CAPABIUTIES, AND FEATURES. 

a Characteristics. 

(1) Transported by truck. 

(2) Operates from 110/220 VAC, 50/60 Hz power. 

(3) Easily maintained. 

(4) System can be deployed using two people. 

b. Capabilities and Features. 

(1) Includes liquid agent resistant liner. 

(2) Provides a recirculation filter which filters and cleans air inside the shelter. 

(3) Has a PE that allows personnel to move from a contaminated area into the protective shelter without 

introducing contaminants. 

(4) Can be operated without HSFC when system is used for training. 

(5) Accessory package contains material and repair tape for restoring damaged liners, hoses, and PE to 

usable condition. 

(6) Provides adapters to interface with environmental control unit (ECU). Two types of MIL-A-52767 ECU 

can be interfaced: 

Type 1, Size C, 18,000 BTU compact vertical air conditioner or 

Type 2, Size C, 18,000 BTU compact horizontal air conditioner. 

(7) On-board spare gaskets to repair air duct hose adapter and filter adapter are stored in the accessory 

package. 

1-3


1-9. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS. 

The M20A1 SCPE has five major components: 

• Room Liners 

• PE 

• HSFC 

• Recirculation filter 

• Accessory package with motor blower. 

a Room Liners The room liner (1) is sealed in a protective plastic bag and packed in rubber-coated-fabric liner 

carrier bag. Liners are made from plastic film that is resistant to toxic liquids and gasses. When a PE is attached and 

liner is pressurized, it provides a protective area for personnel. Room liners (1) of two or more complete systems can be 

attached to one another with a room adapter (2) (included in liner package) to increase protective area. Exterior loops 

and ties (3) on the top of the liner can be used to provide unpressurized support for the room liner (1). Each M20A1 

SCPE is issued with three complete room liner packages (two are on-board spares). 

1-4


b. Protective Entrance (PE). Consists of a collapsible aluminum support frame (1) and a butyl coated fabric 

(2) enclosure. When erected, the PE is free standing. It is triangular in shape with fabric doors (3) on each side. Each 

door has a window (4), slit entrance with hook-and-pile fasteners (5), and hook-and-pile operated vents (6). One side has 

a flange (7) that is used to connect the PE to the room liner. The flange comes with two air duct sleeves (8). The outer 

edge of the flange has a mating hook-and-pile fastener (9). The PE also comes with interval timer (10), two gages (11), 

dome light (12), and power supply (13). Two carrying handles (14) are located on the top. One cable sleeve (I5) is 

located on the inside door. 

1-5


1-9. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (CONT). 

c. Hermetically Sealed Filter Canister (HSFC). Contains gas and particulate filters which remove chemical and 

biological agents and radioactive particles. The HSFC is connected to the motor blower by the short air duct and to the 

SCPE liner through the PE by the long air duct (not shown). The HSFC (1) is hermetically sealed until pull-tabs (2) are 

removed. The HSFC remains in its shipping crate (3) for normal use. 

d. Recirculation Filter. The recirculation filter is a portable self-contained unit. It is used to filter any residual NBC 

contaminants inside a deployed SCPE liner. The cover (1) is attached to the case (2) by four link-lock fasteners (3). The 

case (2) houses the blower and the power switch (4). The power cord (5) plugs into the PE power supply and provides 

110 VAC, 50/60 Hz to the blower. Air enters through the air inlets (6) and is forced downward through the replaceable 

filter element (7). Air exits through the air outlets (8). 

1-6


e. Accessory Package. The accessory package contains all materials required to initiate and sustain operation of 

SCPE. The accessory package is compact and man-portable. It is designed to support the SCPE and contains the 

following: 

(1) Repair Material. Used for extensive repairs of SCPE liners. 

(2) Motor Blower. Provides air flow to inflate and continually purge liners and PE of contaminants. Provides 

power for extension light, recirculation filter, and PE dome light through the power supply located in the 

PE. 

(3) Short Air Duct (5 ft long). Provides airflow from blower to HSFC, has adapters in both ends. 

(4) Tape. Used to repair damaged liner, liner carrier bag, air duct hoses, and PE fabric. 

(5) 220 VAC Cable Adapter. Provides capability to use power cable in 220 VAC (European type) power 

receptacles or with a generator. 

(6) 110 VAC Cable Adapter. Provides capability to use power cable in 110 VAC power receptacles or with a 

generator. 

(7) Extension Light. Provides interior light to liner. 

(8) AC Power Cable Assembly. Provides electrical link between motor blower and 110/220 VAC cable 

adapters. 

(9) Accessory Case. Durable storage and carrying case for SCPE supplies and accessories. 

(10) Long Air Duct (7 ft long). Provides airflow from HSFC through PE to sealed liner. 

(11) Gaskets. On board spares used to repair air duct hose adapter and filter adapter. Consists of six filter 

adapter gaskets and three air duct hose adapter gaskets. 

1-7


1-9. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (CONT). 

f. ECU Adapters (AAL, App C). There are two types of ECU adapters; one for 18,000 BTU horizontal air 

conditioner (1) and one for 18,000 BTU vertical air conditioner (2). ECU adapters are packed in a carrier bag. 

1-10. DIFFERENCES BETWEEN MODELS. 

There is only one version of the M20A1 SCPE. 

1-8


1-11. EQUIPMENT DATA. 

a Dimensions and Weights of SCPE Components 

COMPONENT 

LENGTH WIDTH HEIGHT WEIGHT 

INCH CM INCH CM INCH CM LB KG 

PE (Packaged) 48 121.92 41 104.14 9 22.86 74 33.3 

Accessory Package 39 99.06 24 60.96 13 33.02 76 34.2 

Room Liner Package 30 76.20 24 60.96 12 33.02 37 16.65 

HSFC (Crated) 28 71.12 30 76.20 17 43.18 120 54.43 

Recirculation Filter 17 43.18 17 43.18 27 68.58 40 18.0 

(Packaged) 

ECU Adapter 31 78.74 21 53.34 1 2.54 10 4.5 

Package 

(AAL, App C) 

b. Operating Power Requirements and Characteristics of SCPE. 

POWER INPUT AIRFLOW 

COMPONENT REQUIREMENTS VOLTAGE (CFM) 

Motor Blower 1654 WATTS 110 or 220 VAC 50/60 Hz 200 

Extension Light 100 WATTS 110 VAC NA 

Dome Light 14 WATTS 110 VAC NA 

(28 VDC) 

Recirculation Filter 300 WATTS 110 VAC NA 

1-9


Section III. PRINCIPLES OF OPERATION 

1-12. SYSTEM DESCRIPTION. 

a. To provide NBC protection, a higher pressure must exist inside the shelter than outside the shelter. The airflow 

that causes the pressure must pass through the HSFC. Small leaks in the shelter liner will have no effect as long as 

pressure is maintained inside shelter. 

b. When the system is pressurized, almost all airflow into shelter will flow through PE to the contaminated exterior. 

c. The blower inflates the shelter to a pressure of 0.6 iwg. Vents between shelter and PE are adjusted for pressure 

of 0.6 iwg in shelter, and vents between PE and outside are adjusted for pressure of 0.25 iwg in PE. Clean air flowing 

from shelter to outside through PE purges toxic vapors from PE. 

1-13. FUNCTIONAL DESCRIPTION OF MAJOR COMPONENTS. 

a. Motor Blower. The blower provides a minimum of 200 cubic feet of air per minute to the protective shelter 

through the HSFC. It will operate on 110/220 VAC 50/60 Hz. Blower assembly provides electrical power for extension 

light and PE dome light through output connector J2 to the PE power supply. 

b. Hermetically Sealed Filter Canister (!SFC). This filter removes toxic chemical agents, biological agents, and 

radioactive particles from air passing through it. 

c. Air Ducts. The air ducts provide airflow path for air from blower through HSFC into shelter. 

d. Recirculation Filter. The recirculation filter removes residual toxic agents which may be present inside the 

SCPE liners. The recirculation filter blower motor operates from any 115 VAC 50/60 Hz electrical source. 

e. Room Liner. Room liners are cylindrical in shape and are inflated with filtered air from HSFC and blower. 

The inflated room liners provide a place to work or rest without having to wear protective clothing. 

f. Protective Entrance (PE). PE allows personnel to move from contaminated area into liner without introducing 

contaminants into protected area. 

g. Differential Pressure Gages. There are two gages that read from 0 iwg to 2.0 iwg. One is mounted on liner 

side of PE and measures difference in pressure between inside liner and outside. Another is mounted to inside wall of 

PE and measures difference in pressure between inside PE and outside. The gages are used when adjusting internal 

pressures in shelter and PE. An adjusting tool is provided to adjust gages before operation. 

h. Vents Two vents near the bottom of the two outer PE walls are used to adjust PE pressure. Two vents near the 

top of the liner side of PE wall are used to adjust shelter pressure. PE and shelter pressure can be regulated by adjusting 

these vents. 

i. Dome Light. There is one dome light mounted to the ceiling of the PE which operates at 28 VAC supplied by 

PE power supply. 

j. Interval Timer. A mechanical five-minute bell timer is mounted on the wall of the PE. It is used to time the 

purge period of personnel entering the SCPE from contaminated areas. 

1-10


CHAPTER 2 

OPERATING INSTRUCTIONS 

Section I Description and Use of Operator's Controls and Indicators .................................................... 2-2 

2-1 Motor Blower Assembly ......................................................................................................... 2-2 

2-2 Protective Entrance ............................................................................................................... 2-3 

2-3 Recirculation Filter ................................................................................................................ 2-4 

Section II Preventive Maintenance Checks and Services (PMCS) ......................................................... 2-5 

2-4 Introduction to PMCS Procedures ......................................................................................... 2-5 

2-5 Operator Preventive Maintenance Checks and Services for M20A1 SCPE 

Before ............................................................................................................................... 2-6 

During ............................................................................................................................... 2-15 

After 2-19 

Section III Operation Under Usual Conditions ........................................................................................ 2-22 

2-6 Initial Condition M20A1 SCPE ............................................................................................... 2-22 

2-7 Initial Adjustments and Daily Checks ..................................................................................... 2-22 

2-8 M20A1 SCPE Preparation and Assembly for Use .................................................................. 2-22 

2-9 Operating Procedures ........................................................................................................... 2-44 

2-10 Operation of Auxiliary Equipment .......................................................................................... 2-45 

2-11 Preparation for Movement of M20A1 SCPE .......................................................................... 2-45 

2-12 Operating Instructions on Decals and Plates ......................................................................... 261 

Section IV Operation Under Unusual Conditions .................................................................................... 263 

2-13 Joining Two or More M20A1 SCPE Units .............................................................................. 2-63 

2-14 M20A1 SCPE Used in Area with High Ceilings ...................................................................... 264 

2-15 Installing M20AI Liners Without Pressurization ...................................................................... 2-66 

2-16 Deploying M20AI SCPE in an NBC Environment .................................................................. 2-67 

2-1

Section I. DESCRIPTION AND USE OF OPERATOR'S CONTROLS AND INDICATORS 


2-1. MOTOR BLOWER ASSEMBLY 

Key Control or Indicator Function or Use 

1 Time Totalizing Meter Indicates total hours of blower operation. 

2 Power Switch Two position toggle switch/circuit breaker controls power to blowers, 

extension light, and dome light. Switch is also a 20 amp circuit 

breaker. To reset, turn switch down (off), then up (on). 

2-2


2-2. PROTECTIVE ENTRANCE 

Key Control or Indicator Function or Use 

1 Gages Indicates air pressure difference between outside and inside PE and 

inside shelter and outside. 

Zero adjusting tool is used to turn adjusting screw either left or right 

to align gage needle with zero. 

2 Interval Timers Mechanical timer bell which monitors purge time. Personnel must 

remain in PE until bell sounds. 

2-3

Section I. DESCRIPTION AND USE OF OPERATOR'S CONTROLS AND INDICATORS (CONT) 


243. RECIRCULATION FILTER. 

KEY CONTROL OR INDICATOR FUNTION 

1 Power Switch Two-position rocker switch controls power to internal blower motor. 

Press switch up (on) or down (off). 

2-4


Section II. PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) 

2-4. INTRODUCTION TO PMCS PROCEDURES. 

a. General The Operator PMCS table has been provided so you can keep your equipment in good operating 

condition and ready for its primary mission. The PMCS table is arranged to provide procedures for checks and services 

to be performed before, during, and after operation of the equipment. The following paragraphs provide information on 

how to use the PMCS table. If your equipment does not perform as required, refer to Chapter 3 under Troubleshooting 

for possible problems and corrective actions to be taken. Report any malfunctions or failures on the proper DA Form 

2404, or refer to DA PAM 738-750. 

b. Warnings and Cautions Always observe the warnings and cautions appearing in your PMCS table. Warnings 

and cautions appear before the applicable procedures. You must observe all warnings and cautions to prevent serious 

injury to yourself or others and to prevent damage to your equipment. 

2-5. OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M20A1 SCPE. 

The following paragraphs describe the information presented in each column of the PMCS table. 

a. Item Number Column. Numbers in this column are for reference. When completing DA Form 2404 (Equipment 

Inspection and Maintenance Worksheet), include the item number for the check/service indicating a fault. Item numbers 

also appear in the order that you must do checks and services for the intervals listed. 

b. Interval Column. This column tells you when you must do the procedure in the procedure column. BEFORE 

procedures must be done before you operate or use the equipment for its intended mission. DURING procedures must 

be done during the time you are operating or using the equipment for its intended mission. AFTER procedures must be 

done immediately after you have operated or used the equipment. 

c. Item to Check/Service Column. This column identifies the item to be checked or serviced. 

d. Procedure Column. This column gives the procedure you must do to check or service the item listed in the 

Item to Check/Service column to know if the equipment is ready or available for its intended mission or for operation. 

You must do the procedure at the time stated in the interval column. 

e. Not Fully Mission Capable If: Column. Information in this column tells you what faults will keep your 

equipment from being capable of performing its primary mission. If you make check and service procedures that show 

faults listed in this column, do not operate the equipment. Follow standard operating procedures for maintaining the 

equipment or reporting equipment failure. 

f. Other Table Entries. Be sure to observe all special information and notes that appear in your table. 

2-5

OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M20AI SCPE 


NOTE 

If the equipment must be kept in continuous operation, do only those procedures that can be 

done without disturbing operation. Make complete checks and services when the equipment is 

shut down. 

Item Interval Item To Be Procedure Not Fully Mission 

No. Check/Service Capable If: 

1 Before Room Liners a. Inspect room liners (1) for Two of the three line cannot be 

punctures, tears, separated seams, repaired and can no longer 

worn hook-and-pile fasteners, maintain pressure 

and proper connections. Repair 

fabric if necessary (para 3-3). 

b. Check to ensure room adapters Adapters are missing 

(2) are available with room liner. 

c. Check room adapter for worn Hook-and-pile fasteners will not 

hook-and-pile fastener (for stay fastened. 

multiple unit liners only). 

2-6




2 Before PROTECTIVE a. Inspect PE fabric (1) for punc- Fabric is punctured or torn, windows 

ENTRANCE tures or tears, broken windows broken, vent flaps missing, seams 

(2), missing vent flaps (3), separated, or hook-and-pile 

fasteners 

separated seams, or worn hookwill 

not stay closed. 

and-pile fasteners (4). Repair 


b. Check for distorted, cracked, or . Frame will not erect properly. 

bent frame (5). 

c. Check for broken or missing Frame legs cannot be locked into 

hinge pins (6) (three per leg). place. 

d. Check that legs are locked and Frame legs will not lock together. 

knob (7) is present. 

e. Check for broken or missing More than two link-lock fasteners 

link-lock fasteners (8). 

are broken or missing. 

2-7

OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M20A1 SCPE (CONT) 




2 Before PROTECTIVE f. Inspect power supply (9) for Cracked or split wire, insulation or 

ENTRANCE dents or cracks. Inspect both connector or miming connector or 

(CONT) power cords (10) for bare wire, missing connector pins. 

cracked or split insulation or 

connector on missing connector 

or missing connector pins (11). 

3 Before INTERVAL TIMER Check that interval timer (12) Interval timer is inoperative. 

operates. Turn knob (13) clockwise 

back to zero (five minutes). 

Monitor to ensure timer is 

functioning properly and bell 

rings. 

2-8




4 Before GAGES a. Check gages (14) (located on Glass is broken, or tubing missing 

or 

inside and outside wall of PE) for damaged. 

broken glass (15), and ensure that 

tube (16) is connected. 

b. Check that gages adjust to zero as Gage(s) will not adjust. 

follows: 

(1) Insert zero adjusting tool (17) 

in adjusting screw (18). 

(2) Turn adjusting tool (17) right 

to raise or left to lower to 

zero. 

5 Before HSFC NOTE 

It is vital that the HSFC for SCPE be fully serviceable. As an 

operator you are responsible for notifying unit maintenance for 

replacement in accordance with filter change criteria contained 

in FM 3-4. 

Inspect HSFC (1), especially seams HSFC is dented, seam cracked or 

(2), for cracks, dents, or holes. dented deeper than 1/4 inch, or has 

Check for water damage around holes. Tab pull damaged. 

the tab pull. 

2-9

OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M20AI SCPE (CONT) 




7 Before ACCESSORY a. Check for missing components. Components missing. 

PACKAGE Each kit should have: 

(1) Repair material 

(2) Motor blower assembly 

(3) Short air duct 

(4) Tape 

(5) 220 VAC cable adapter 

(6) 110 VAC cable adapter 

(7) Extension light 

b. Check 220 VAC cable adapter Cable adapters or power cable have 

(5), 110 VAC cable adapter (6), bare wires, cracked or split 

insulation 

and power cable (8) for bare wires, or connectors, or bent, broken or 

cracked or split insulation or missing connector pins or sockets. 

connectors, and bent, broken, or 

missing connector pins or sockets. 

2-10




7 Before MOTOR BLOWER a. Check for cracks, broken, or Housing is cracked, broken, or 

distorted housing (1). 

distorted. 

b. Check air outlet flange (2) for bent Air duct cannot be connected to 

motor 

pins or missing pins (3) and miss- blower assembly. 

ing electronic component shield 

(4). 

c. Check electrical connectors (5) Any pins are missing or electrical 

for cracks, dents, bent or missing cables cannot be connected to 

motor 

pins, or missing electrical connec- blower. 

tor covers (6). 

d. Check time totalizing meter (7) to Totalizing meter indicates 500 hours 

see if 500 hours have passed since have elapsed since last motor 

last blower motor replacement. replacement. 

2-11





8 Before AIR DUCTS a. Check air duct hoses (1) for Air duct hoses punctured, torn or 

punctures, tears, or protruding have protruding wires. 

wires at end of duct. Repair hose 

if necessary (para 3-3). 

b. Check for damaged or missing Adapter, clamp, or gaskets missing 

adapters (2), hose clamps (3), and ` or damaged. 

gaskets (4). 

9 Before EXTENSION a. Check light (1) for cracked or Extension light has bare wires, 

broken 

LIGHT bare wires (2), missing screw on insulation, prongs missing, 

connector 

connector (3), cracked connector cracked, or screws missing. 

(3), or missing or bent prongs 

on connector (3). 

b. Check that lamp (4) is operating. Lamp inoperative. 

2-12




10 Before RECIRCULATION NOTE 

FILTER 

It is vital that recirculation filter for SCPE be fully serviceable. As 

an operator you are responsible for notifying unit maintenance for 

replacement in accordance with filter change criteria contained in 

FM 34. 

a. Check electrical cable (1) for bare Cable has bare wires or broken 

wires or broken connector (2) or connector. 

missing connector or missing 

connector pins (3). 

b. Check cover (4), lower case (5), Cover, case, or fan impeller blade 

fan impeller blade (6),and guard damage prevents normal operation. 

(9) for damage. 

c. Check that filter (7) is present. Filter is missing. 

d. Remove cover by releasing four Filter has punctures or is water 

link-lock fasteners (8) and pull damaged. 

filter up and check for punctures 

or water damage. 

2-13





11 During ROOM LINERS Inspect room liners (1) and adapters Liner(s), including tape repairs, can 

(2) for punctures, tears, separated no longer maintain pressure or 

hookseams, 

worn book-and-pile fasteners, and-pile fasteners will not stay 

and proper connections. Repair fastened. 


2-14




12 During PROTECTIVE Inspect PE fabric (1) for punctures PE fabric, including tape repairs no 

ENTRANCE or tears, broken windows (2), missing l longer maintain pressure or hookandvent 

flaps (3), separated seams, or pile fasteners will not stay fastened. 

worn hook-and -pile fasteners (4). 

Repair fabric if necessary (para 3-3). 

13 During DOME LIGHT Check that dome light (1) is on. Dome light is inoperative and no 

other light source is available. 

14 During INTERVAL Check that interval timer (2) Interval timer is inoperative. 

TIMER operates. Turn knob (3) clockwise 

back to zero (five minutes). Monitor 

to ensure timer is functioning properly 

and bell rings. 

2-15





15 During GAGES a. Check gages (1) (located on inside Glass is broken, tubing is missing. 

and outside wall of PE) for broken 

glass (2), and tube (3) is missing. 

b. Check that pressure reading in PE Pressure is below 0.2 iwg in PE or 

is not below 0.2 iwg. 

below 0.4 iwg in liner. 

c. Check that pressure reading in 

liner is not below 6.4 iwg. 

16 During MOTOR BLOWER a. Check for noisy operation. Operating noise level is unusual. 

b. Ensure time totalizing meter (1) Time totalizing meter is inoperative. 

is operating. 

2-16




17 During EXTENSION Check that lamp (1) is operating. Light inoperative. 

LIGHT 

18 During RECIRCULATION NOTE 

FILTER 

It is vital that recirculation filter for SCPE be fully serviceable. As 

an operator you are responsible for notifying unit maintenance for 

filter replacement in accordance with filter change criteria 

contained 

in FM 34. 

Check recirculation filter (1) for 

noisy operation. 

Operating noise level is unusual. 

2-17





19 After ROOM LINER a. Check to ensure room adapter (2) Room adapter is missing. 

is available with room liner. 

b. Check for worn hook-and-pile Hook-and-pile fasteners will not stay 

fasteners. 

fastened. 

20 After PROTECTIVE Check for broken or missing link- More than two link-lock fasteners 

are 

ENTRANCE lock fasteners (1). broken or missing. 

2-18




21 After HSFC NOTE 

It is vital that the HSFC for SCPE be fully serviceable. As an 

operator you are responsible for notifying unit maintenance 

for HSFC replacement in accordance with filter change criteria 

contained in FM 3-4. 

Inspect HSFC (1), especially seams HSFC is dented, seams cracked or 

(2), for cracks, dents, or holes. dented deeper than 1/4 inch, or has 

Check for water damage. 

holes. HSFC water damaged. 

22 After ACCESSORY Check for missing components. Each Components missing. 

PACKAGE package should have: 

(1) Repair material 

(2) Motor blower assembly 

(3) Short air duct 

(4) Tape 

(5) 220 VAC cable adapter 

(6) 110 VAC cable adapter 

(7) Extension light 

(8) Power cable assembly 

2-19


OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M20AI SCPE (CONT) 



23 After MOTOR BLOWER Check time totalizing meter (I) to see Totalizing meter indicates 550 hours 

if 550 hours have passed since last have elapsed since last motor 

replaceblower 

motor replacement. 

ment. 

24 After RECIRCULATION NOTE 

FILTER 

It is vital that recirculation filter for SCPE be fully serviceable. 

As an operator you are responsible for notifying unit maintenance 

for filter replacement in accordance with filter change criteria 

contained in FM 3-4. 

a. Check electrical cable (1) for bare Cable has bare wires or broken 

wires or broken connector (2) or connector or missing connector or 

missing connector or missing missing connector pins. 

connector pins (3). 

b. Check cover (4), lower case (5), Cover, case, or fan impeller blade 

fan impeller blades (6), and guard damage prevents normal operation. 

(7) for damage. 

2-20


Section III. 

OPERATION UNDER USUAL CONDITIONS 

2-6. INITIAL CONDITION M20AI SCPE. 

a. Site Selection. Consider the following conditions when selecting a structure to house an M20A1 SCPE. 

(1) Location serves tactical situations. 

(2) Location shielded from weapons or blast. 

NOTE 

Entire M20A SCPE must be deployed indoors. 

(3) Location away from low areas where chemical vapors tend to collect. 

b. Room Selection. 

(1) The M20A1 SCPE should be deployed in a room with four walls, a floor and a ceiling, all in good 

condition. 

(2) Electrical power available within 25 ft. of chosen room and have at least a 15 Amp circuit breaker. 

2-7. INITIAL ADJUSTMENT AND DAILY CHECKS. 

Perform before PMCS (para 2-5). 

2-8. M20A1 SCPE PREPARATION AND ASSEMBLY FOR USE. 

a. Preparation. 

CAUTION 

Hot radiators, heaters, and lights in selected room may damage room liner. 

(1) Turn off radiator, heaters, and lights in selected room. 

WARNING 

Three major components of M20AI SCPE weigh approximately 100 pounds each. Lifting and/or 

carrying can be accomplished by no fewer than two personnel. Failure to do so can result in 

severe injury to personnel. 

(2) Carry components of M20Al SCPE (requires two personnel) into selected structure. Place components 

near door of selected room. 

CAUTION 

Debris on floor of selected room may damage room liner. 

2-21


(3) Remove furnishings and debris which will interfere with deployment of SCPE. 

NOTE 

If selected room has windows, refer to your unit Standing Operating Procedures (SOP) or your 

supervisor for blackout procedure before continuing. 

Wipe dusty surfaces with dry rag (Item10, App D) before applying tape. 

(4) Using tape from accessory package, seal windows, pad sharp objects and overhead lights. 

b. M20A1 Room Liner Installation. 

(1) Open room liner carrier bag (1) and remove room liner (2). 

(2) Carry room liner (2) into prepared room. Place room liner with loop ties facing up. Carefully unfold and 

spread liner on floor. 

2-22


2-8. M20AI SCPE PREPARATION AND ASSEMBLY FOR USE (CONT). 

(3) Position room liner so it will mate with PE through doorway. If doorway cannot be used, and room is large 

enough, both room liner and PE can be deployed inside prepared room. 

CAUTION 

Avoid walking near edges of room liner floor. Furniture, equipment, or personnel can puncture 

liner if positioned where weight is placed on outer boundary of room liner floor. 

NOTE 

Two personnel must hold top of room liner opening high to allow entry. Furniture or equipment 

is placed as close to center of room liner as possible. 

(4) Place furniture or equipment in room liner (2). 

(5) Remove extension light (3) from accessory package and place on floor inside room liner (2). 

(6) Place recirculation filter blower (1) on floor inside room liner (2) where it will not interfere with personnel 

movement. 

2-23


c. Installing Protective Entrance (PE). 

WARNING 

PE weighs approximately 74 lbs. At least two personnel are required to carry and erect PE to 

prevent injury to personnel. 

(1) Place PE (1) near the room liner entrance, where it will be used. 

(2) Unlock link-lock fasteners (2) on three sides of PE (1). 

(3) Ensure locking bar (3) on each PE leg (4) is in unlocked position. 

2-24


2-8. M20A1 SCPE PREPARATION AND ASSEMBLY FOR USE (CONT). 

WARNING 

Improper lifting of PE top when erecting may cause back strain to personnel. To avoid back 

strain, follow proper lifting procedures. 

(4) To avoid back strain, lift PE top as follows: 

NOTE 

Two personnel are required to lift PE. 

(a) 

Squat down with knees bent and back straight. 

(b) Grasp handles (5). 

(c) Keep back straight and use your legs to left PE top (6). 

WARNING 

Keep hands clear of leg hinges when erecting PE. Pinching hands or skin in hinged joints can 

cause serious injury. 

(5) At chest height, while holding handle (5) firmly, slip one hand to underside of PE top (6). Holding top up 

from below, move other hand to underside of PE top. 

2-25


(6) Push top (6) up as high as possible. While holding top (6) up with one hand, firmly grasp one PE leg (4) 

with other hand. 

(7) While firmly holding PE leg (4) with one hand, move other hand to opposite leg and pivot both legs to a 

straight position. 

(8) Push locking device (7) on each leg (4) in and down to lock. 

(9) Using attached zero adjusting tool (8), adjust gage (9), on outside PE wall, to zero. 

(10) Using attached zero adjusting tool (8), adjust gage (10), on inside PE wall, to zero. 

(11) Position PE next to PE airlock adapter. 

(12) Pass power cord (11) from inside PE through cable sleeve (12) and duct sleeve (13). 

(13) Tighten cable sleeve. 

2-26



d. Attaching Room Liner to PE. 

(1) If passage from PE to room liner is through an existing doorway, position PE so flange (1) extends into 

doorway (2). 

NOTE 

Attaching room liner to PE requires two personnel. 

Mate hook-and-pile fasteners as smoothly as possible to avoid excess air leakage from room 

liner. 

(2) Lift top of room liner (3) opening over your head and step inside room liner. Aline top of room liner with 

top of PE flange (1). 

2-27


(3) Second person enters room liner, attaches room liner (3) to PE flange (1) by first attaching top corners, 

then working hook-and-pile fasteners (4) toward center. Pinch off any excess material at center. 

(4) Attach bottom two corners and work hook-and-pile fasteners (4) toward center. Pinch off excess material 

at bottom center. 

(5) Working from corners, join hook-and-pile fasteners (4) along the sides. Pinch off any excess material at 

centers. 

e. Assembling Motor Blower and HSFC. 

CAUTION 

Do not drop the hermetically sealed filter canister (HSFC). Dropping could cause broken seals. 

(1) Place crated HSFC (1) as close to PE (2) as possible and in vicinity of power source (3). 

2-28



WARNING 

Do not locate motor blower near an area where exhaust gasses are generated because HSFC will 

not remove carbon monoxide. Breathing carbon monoxide gasses can cause serious illness or 

death to personnel inside SCPE. 

(2) Remove motor blower (4) from accessory package (5) and place it beside crated HSFC (1). 

2-29


(3) Remove long air duct (6) (has one adapter) from accessory package. 

(4) Feed end without adapter through duct sleeve (7) on PE fange (8). 

(5) Fasten hook-and-pile strap (9) around air duct. 

(6) Secure duct sleeve strap (10) around duct sleeve (7). 

(7) Tie off unused duct sleeve. 

2-30



(8) Open lid of crate containing HSFC (1) as follows: 

(a) 

(b) 

Unfold wire loops (11) holding lid (12) closed and fold lid back. 

Remove foam cover (13) from crate. Set foam cover aside for re-use. 

WARNING 

Sharp edges on the HSFC can cause injury to personnel. Use care when connecting or 

disconnecting air ducts to HSFC. 

NOTE 

Odor of ammonia is common when HSFC is first opened. Odor will soon disappear and is not 

harmful to personnel. 

(9) Remove outlet (outer) port pull-tab lid (14) from HSFC (1). 

(10) Connect adapter end of long air duct (6) to outlet port (15) by pushing spring button (16) in. 

(11) Insert adapter in outlet port (15) by pushing in spring button (16). 

2-31


(12) Remove short air duct (17) from accessory package and attach to output of motor blower as follows: 

(a) 

(b) 

Aline slots in adapter (18) with pins in motor blower outlet port (19). Push adapter in. 

Rotate adapter clockwise to lock in place. 

(13) Remove inlet center port pull-tab lid (20) from HSFC (1). 

(14) Connect other end of short air duct (17) to inlet port (21) of HSFC. 

(15) Remove any kinks or bends in air ducts by moving components. 

2-32



WARNING 

To prevent electrical shock, ensure motor blower power switch is in off (down) position before 

connecting or disconnecting power cable. 

(16) Remove power cable (22) from accessory package. 

(17) Remove connector covers (23) from motor blower (24) connectors J1 (25) and J2 (26). 

(18) Connect power cable (22) connector P2 to input connector Jl (25) of motor blower (24). 

(19) Connect power cable (22) connector P1 to either the 110 VAC cable adapter (27) or 220 VAC cable 

adapter (28) depending on power source available. 

(20) Connect PE power supply power cord (29) and connect to output connector J2 (26). 

(21) Connect cable adapter (27 or 28) to power source. 

2-33


f. Installing Recirculation Filter. 

(1) Check that recirculation filter power switch (1) is in down (off) position. 

(2) Place recirculation filter inside room liner where it will not interfere with personnel movement or restrict 

airflow. 

CAUTION 

To avoid overloading motor blower, do not plug more than one recirculation filter blower into PE 

power supply. 

(3) Plug recirculation filter power cord (2) into PE power supply. 

g. Inflating Room Liner. 

(1) Close all vents (1) on PE. 

2-34



WARNING 

Motor blower operating noise may be hazardous to operator hearing. Hearing protection must be 

worn when remaining within 4 feet of motor blower in operation. Failure to wear hearing 

protection can result in hearing loss. 

NOTE 

Walking into and out of SCPE liner should be kept to a minimum so liner can inflate quickly. 

(2) Turn motor blower power switch (2) to the up (on) position. 

(3) As room liner begins to inflate, enter room liner (one person only). Before room liner is fully inflated, 

attach extension light (4) to room liner ceiling, using hook-and-pile fasteners (5). Smooth out room liner 

material and remove wrinkles from floor and walls. Watch room liner as it inflates, making sure that it 

does not snag on any objects within room. 

2-35


(4) Pass plug end of extension light cord (6) through PE cable sleeve (7). 

(5) Insert plug into outlet on power supply (8). 

(6) Secure cable sleeve (7) around extension light cord (6). 

NOTE 

To conserve filter life, do not turn on recirculating filter until room liner is inflated. 

(7) Turn recirculation filter power switch to the up (on) position. 

h. Adjusting Internal Pressures. 

NOTE 

Two personnel are required to adjust internal pressures of PE and room liner, one in PE and 

other in liner. 

Opening vents from liner to PE will reduce the pressure in liner and increase pressure in PE. 

Opening vents from PE to outside will reduce pressure in PE. 

Change only one vent at a time. Wait at least 10 seconds between changes to allow pressures to 

stabalize. 

Maximum allowable operating pressure in liner is 1.20 iwg; minimum allowable operating 

pressure in liner is 0.6 iwg. 

2-36



(1) Set one interior vent (1) and one exterior vent (2) to half open (others are closed). From inside liner, 

monitor internal gage (3). 

(2) Allow liner pressure to build up to 1.20 iwg (close interior vents (1) as necessary). 

(3) After liner pressure has stabilized between 0.6 and 1.20 iwg, as indicated on PE internal gage (3), adjust 

exterior vents (2), as required to maintain the pressure between 0.2 and 0.3 iwg in PE. From inside PE, 

monitor external gage (4). 

2-37


i. Installing Horizontal ECU Adapter (AAL, App C). 

(1) Loosen four 1/4 turn fasteners (1) from ECU adapter frame (2). 

(2) Separate inner ECU adapter frame (2) from outer ECU adapter frame (3). 

(3) Using screwdriver (Item 11, App D), remove screws (4) from front of ECU duct (5) and remove ECU duct 

(5). 

(4) Place ECU adapter duct (6) around ECU duct (5). 

(5) Using screwdriver (item 11, App D), install ECU duct (5) on ECU (7). 

(6) Place ECU (7) next to room liner (8) exterior to determine the position ECU adapter will be installed on 

room liner. 

(7) From outside room liner (8), have person hold outer ECU adapter frame (3) against room liner (8) at 

position determined in step 6. 

2-38



(8) From inside room liner (8) have another person aline inner ECU adapter frame (2) with outer frame. 

(9) From inside room liner (8) tighten four 1/4 turn fasteners (1) through inner ECU adapter frame (2), room 

liner (8), and outer ECU adapter frame (3). 

(10) Using pocket knife (Item 6, App D) cut room liner material (8) from inside ECU adapter frame (2). 

(11) Feed ECU power cord (9) through ECU adapter duct sleeve (10) and secure duct sleeve around ECU 

power cord (9). 

2-39


WARNING 

Do not operate ECU with ECU make up air ports open. System will become contaminated which 

can result in serious illness, injury, or death to personnel. 

(12) Close ECU make up air ports (11). 

(13) Operate ECU in accordance with TM 5-4120-379-14. 

j. Installing Vertical ECU Adapter. 

(1) Loosen four 1/4 turn fasteners (1) on both vertical ECU adapter frames (2). 

(2) Separate inner ECU adapter frames (3) from outer ECU adapter frames (2). 

2-40



(3) Using screwdriver (Item 11, App D), loosen screws (4) from front of ECU ducts (5) and remove ECU ducts 

(5). 

(4) Place ECU adapter ducts (6) around ECU ducts (5). 

(5) Using screwdriver (Item 11, App D), install ECU ducts (5) on ECU (7). 

(6) Place ECU (7) next to room liner (8) exterior to determine the position ECU adapter will be installed to 

room liner. 

(7) From outside room liner (8) have person hold inner ECU adapter frames (3) against room liner (8) at 

position determined in step 6. 

2-41


(8) From inside room liner (8) have another person aline outer ECU adapter frames (2) with inner frames (3). 

(9) From inside room liner (8) tighten four 1/4 turn fasteners (1) on each interface frame through outer ECU 

adapter frames (2), room liner (8), and inner ECU adapter frames (3). 

(10) Using pocket knife (Item 6, App D) cut room liner material (8) from inside both ECU adapter frames (2). 

WARNING 

Do not operate ECU with ECU make up air ports open. System will become contaminated which 

can result in serious illness, injury, or death to personnel. 

(11) Close ECU make up air ports. 

(12) Operate ECU in accordance with TM 5-4120-379-14. 

2-42


2-9. OPERATING PROCEDURES. 

a. General. 

(1) Personnel entering SCPE shall follow entry procedures in FM 3-4 and unit SOP when chemical or 

biological contamination of protective clothing or personal equipment is known or suspected. 

(2) When SCPE is deployed in a toxic environment, it may take up to 1-1/2 hours to purge liner of toxic vapors 

from time motor blower is turned on. 

(3) Make sure motor blower and recirculation filter are on and operating. 

b. PE Entry Procedure. 

WARNING 

Personnel who enter SCPE must wear clean, uncontaminated protective mask and clothing. 

Failure to wear uncontaminated protective mask and clothing can result in further contamination 

of personnel. Contact with biological or chemical agents can result in serious illness, injury, or 

death. 

WARNING 

Do not take equipment into interior of SCPE unless you are certain that it has never become 

contaminated or that it has been thoroughly decontaminated. This includes your weapon. 

NOTE 

Only one person may enter PE at a time. 

(1) Before entering PE, look through PE window to ensure PE is unoccupied. 

(2) Enter PE and ensure door is closed and hook-and-pile fasteners are sealed. Set interval timer, mounted 

on PE inside wall, by turning knob fully clockwise to 5 minutes. 

(3) If interval timer does not sound or knob does not return to zero, reset timer to five minutes (use a watch or 

count aloud if necessary). 

(4) After interval timer bell sounds, enter liner in accordance with procedures outlined in FM 34. 

2-43


c. PE Exit Procedures. 

(1) Exit protective area as follows: 

NOTE 

For guidance on exit procedures, see FM 34 and unit SOP. 

(a) 

Look through PE window to ensure PE is unoccupied and interval timer is set at zero. This shows 

that the PE has not been occupied and no wait is necessary before entering the PE. Otherwise, wait 

until the interval timer bell sounds (about five minutes) before exiting. 

(b) Turn interval timer knob to zero (5 minutes). This is to let anyone still inside shelter know when 5- 

minute purge time is over. 

(2) Exit PE in accordance with FM 3-4 and unit SOP. 

2-10. OPERATION OF AUXILIARY EQUIPMENT. 

WARNING 

Locate generator outside structure or in well ventilated area. Do not locate motor blower near an 

area where engine exhaust gasses are generated. Filter will not protect against carbon 

monoxide. Carbon monoxide poisoning can cause illness, incapacitation, or death to personnel. 

a. The SCPE can be operated from a portable generator (App C) when commercial electric power is not available. 

Refer to TM 5-6115-323-14 for operation of portable generator. 

b. Observe the following precautions: 

(1) Place portable generator outside building if possible. 

(2) If portable generator must be inside structure, place at maximum power cable length from blower. 

2-11. PREPARATION FOR MOVEMENT OF M20A1 SCPE. 

WARNING 

SCPE known to be or suspected of biological or chemical agent contamination, must be 

decontaminated before striking. 

Protective mask and clothing must be worn by personnel handling contaminated components of 

SCPE. 

2-44


2-11. PREPARATION FOR MOVEMENT OF M20A1 SCPE (CONT). 

a. Decontaminating SCPE. 

NOTE 

Procedures for disposal of contaminated liners and HSFC are in unit SOP and FM 34, NBC 

Protection. 

Decontaminate all components except liner (see FM 3-5, NBC Decontamination). 

b. Striking SCPE. 

NOTE 

Disassemble SCPE in sequence described in the following procedures. Stow accessory package 

items in marked slots. 

(1) Disconnect motor blower as follows: 

WARNING 

Ensure motor blower power switch is in down (off) position before connecting or disconnecting 

power cable. 

(a) 

(b) 

(c) 

Set power switch (1) to down (off) position. 

Disconnect 110/220 VAC cable adapter (2) from power source. 

Disconnect power cable (3) from motor blower. 

(d) Disconnect cable adapter (2) from power cable (3). 

(e) 

(f) 

Stow power cable and cable adapter in accessory package. 

Disconnect electric power cord (4) from motor blower. Coil power cord and store on floor of PE. 

(g) Attach connector covers (5). 

(h) 

(i) 

Disconnect short air duct (6) from motor blower by turning counter-clockwise. 

Store motor blower in accessory package. 

2-45


(2) Remove and store extension light as follows: 

(a) 

(b) 

(c) 

Unplug extension light plug (1) from power supply (2) in PE. 

Disconnect hook-and-pile fastener on cable sleeve. 

Pull plug (1) of extension light (3) into liner. 

(d) Remove extension light (3). 

(e) 

(f) 

Wrap cord in a roll. 

Stow extension light in accessory package. 

(3) Remove and store air ducts as follows: 

NOTE 

When storing air ducts in accessory package, put one end of air duct in correct slot and carefully 

push rest of air duct in. 

(a) Depress spring button (1) on short air duct (2), tilt upward, and remove from HSFC (3). 

(b) 

Store short air duct (2) in accessory package. 

2-46



(c) 

Open hook-and-pile fasteners straps (4) to disconnect long air duct (5) from PE and pull air duct 

through duct sleeve to outside. 

(d) Depress spring button on long air duct (5), tilt upward, and remove from HSFC (3). 

(e) 

Store long air duct (5) in accessory package. 

(4) Crate HSFC as follows: 

(a) Replace foam cover (1) on top of HSFC (2). 

(b) 

(c) 

Close lid (3) of HSFC crate. 

Fold wire loops (4) to secure lid. 

2-47


(5) Inventory and close accessory package as follows: 

(a) Check that components are present (para 2-5). 

(b) Close cover (1) and secure three link-lock fasteners (2). 

(6) Strike Protective Entrance (PE) as follows: 

(a) Disconnect room liner (1) from PE flange (2). 

(b) 

Close all vents (3) on PE. 

2-48



(c) Unplug recirculation filter power cord (1) from PE power supply (2). 

(d) Remove recirculation filter power cord from PE through cable sleeve (3). 

WARNING 

Avoid pinching skin or protective garments in hinge joints to prevent injury or contamination. 

CAUTION 

Do not allow PE to collapse suddenly. Allowing PE to collapse could damage frame and fabric. 

2-49

NOTE 

Striking PE requires at least two personnel. PE may be moved to open area for easier handling. 


(e) 

Hold PE top up firmly with one hand. Push knob (4) on leg (5) in and up to unlock each leg. 

2-50



(f) 

(g) 

(h) 

(i) 

While still holding top with one hand, firmly grab one leg (6); push or pull to start folding action. Carefully 

switch hands and repeat for third leg. 

Using both hands, carefully lower PE top about halfway down. 

Slowly lower top as you bend one knee, letting top (7) rest on other knee. Place knee at center to balance 

PE top. 

While holding top of PE on your knee, tuck fabric (8) in beyond legs so when PE is closed, legs will not 

pinch fabric. Ensure handles on link-lock fasteners do not catch between halves when lowering PE. 

2-51


(j) 

(k) 

Grab handles (9) on top and slowly close PE. Ensure fabric does not interfere with closing, Check that 

fabric is not pinched in legs or top and bottom before continuing. 

Lock link-lock fasteners on all three sides of PE as follows: 

(1) Pivot fastener (10) up to meet mating part 

(2) Turn handle (11) clockwise until completely locked 

WARNING 

To avoid back strain, keep your back straight and use your leg muscles to lift the PE. 

NOTE 

Lifting and moving the PE requires two personnel. 

(1) To lift the PE 4 feet or higher from the ground, squat down (with knees bent and back straight), grasp a 

handle (15) with one hand and place the other hand under the PE. As you begin to lift, use your knee to 

hold some of the PE weight while moving your hand from the handle to the bottom of the PE. 

NOTE 

Make certain you have a firm grip on the PE before lifting higher. 

2-52


2-11. PREPARATION FOR MOVEMENT OF M20AI SCPE (CONT). 

(7) Remove recirculation filter as follows: 

(a) Coil recirculation filter power cord (1). 

(b) 

Remove recirculation filter (2) from room liner. 

(8) Horizontal ECU Adapter. 

(a) 

(b) 

Disconnect ECU power cord (1) from power source. 

Untie ECU adapter duct sleeve (2) and pull ECU power cord (1) through ECU adapter duct sleeve 

(2). 

(c) Loosen four 1/4 turn fasteners (3) and remove outer ECU adapter frame (4). 

(d) 

Move ECU away from liner. 

2-53 

2-53


NOTE 

Leave ECU adapter attached if it will be required during next mission. 

(e) Using screwdriver (Item 11, App D), remove ECU duct (5) from ECU (6). 

(f) Remove ECU adapter duct (7) from ECU duct (5). 

(g) 

Using screwdriver (Item 11, App D), install ECU duct on ECU. 

(h) Aline outer ECU adapter frame (4) with inner ECU adapter frame (8). 

(i) Tighten four 1/4 turn fasteners (3). 

2-54



(j) 

Place ECU interface in carrier bag (9) and close. 

(9) Vertical ECU adapters. 

(a) 

(b) 

(c) 

Disconnect ECU power cord (1) from power source. 

Loosen four 1/4 turn fasteners (2) on each outer ECU frame (3) and remove frames. 

Move ECU away from liner. 

2-55


NOTE 

Leave ECU adapter attached if it will be required during next mission. 

(d) 

Using screwdriver (Item 11, App D), loosen screws from front of ECU ducts (4) and remove ECU ducts. 

(e) Remove ECU adapter ducts (5) from ECU ducts (4). 

(f) Using screwdriver (Item 11, App D), install ECU ducts (4) to ECU (6). 

(g) Aline outer ECU frames (3) with inner ECU adapter frames (7). 

(h) 

Tighten four 1/4 turn fasteners (2) on each ECU adapter frame. 

2-56



(i) 

Place ECU adapter in carrier bag (8) and close. 

(10) Room Liner, M20A1 SCPE. 

NOTE 

If room liner has been contaminated, refer to your unit SOP, or NBC NCO for disposal 

instructions. 

If lumber and nails were used during unusual installation procedures, liner is not to be reused. 

Dispose of room liner in accordance with unit SOP. 

Extension light from accessory package may be used to provide lighting. 

Two additional personnel will be required to hold liner opening open to remove furniture and 

equipment. 

(a) 

Remove all equipment and furniture. 

NOTE 

Folding room liner requires two personnel. 

2-57


(b) 

(c) 

(d) 

Locate circular floor seam at bottom of opening. 

Straighten circular seam to form smooth circle. 

Locate top circular seam (above top liner opening). 

(e) Place top seam directly on top of bottom seam. Tuck liner sides inward to form a circle (1). 

(f) Fold a 13 in. width of only top layer toward center to expose liner opening (2). 

(g) 

With liner opening at center, fold left side of liner (top and bottom together), in 2-ft. wide folds, until folds 

reach center line. Force air out after each fold. 

2-58



(h) 

(i) 

(j) 

Repeat step (g) for right side. There should be about 3 to 6 in. gap between sides. 

Fold one side onto other. Force air out toward liner opening. 

Fold lengthwise into quarters. Force air out towards liner opening. 

(k) 

Place folded liner into liner bag and reseal. 

2-59


2-12. OPERATING INSTRUCTIONS ON DECALS AND INSTRUCTION PLATES. 

ERECTION OF PROTECTIVE ENTRANCE 

Motor Blower and HSFC 

1. UNLOCK LATCHES ALL 3 SIDES. 

2. GRASP HANDLES AND LIFT. 

3. FULLY EXTEND LEGS INTO POSITION. 

4. PUSH IN AND DOWN ON LOCKING KNOBS 

TO LOCK EACH LEG IN PLACE. 

5. ATTACH PROTECTIVE ENTRANCE TO 

LINER. 

6. SEE OPERATOR'S MANUAL 

DECONTAMINATE PRIOR TO ENTRY. 

DO NOT REMOVE MASK UNTIL ENTRY PURGE IS 

COMPLETE. 

NO COMBUSTION HEATERS INSIDE PROTECTED 

AREA. 

SEE OPERATOR'S MANUAL 

Protective Entrance 

2-60


2-12. OPERATING INSTRUCTIONS ON DECALS AND INSTRUCTION PLATES (CONT). 


2-61


2-13. JOINING TWO OR MORE M20A1 SCPE UNITS. 

Section IV. OPERATION UNDER UNUSUAL CONDITIONS 

WARNING 

This procedure should be done only in an uncontaminated environment. 

NOTE 

If shelter of more than 200 square feet of floor space is needed, two or more complete SCPE 

systems can be joined using these procedures. 

a. Set up and inflate one complete M20A1 SCPE system (para 2-8). 

b. Select an unused door frame (1) on primary room liner (2). Door will be framed by pile fastener. 

c. Using hook-and-pile fastener, attach room adapter (3) to door frame. 

d. Unfold additional room liner (4) with door opening (5) facing primary room liner door frame (6). 

e. Place equipment and furniture in additional room liner as required. 

f. Attach additional room liner door opening (5) to room adapter (3) using hook-and-pile fastener. 

g. From inside primary room liner, use knife (Item 6, App D) to cut out door opening (7) leaving a one inch border 

inside hook-and-pile frame. As liner is being cut, air from primary room liner will inflate additional room liner. 

h. Using hook-and-pile fastener, attach room adapter corner flaps (8), located at each corner of adapter, to inside 

corners of primary (2) and additional room liner (4). 

2-62


2-14. M20A1 SCPE USED IN AREA WITH HIGH CEILINGS. 

a. General. 

NOTE 

Pressure inside SCPE must be adjusted (para 2-8h) before reaching between 0.6 1.20 iwg. 

If liner of SCPE is inflated in areas where ceiling height is greater than liner height, some loss of usable floor 

area will occur as liner tends to assume a ball shape. Where a ceiling is higher than 12 ft., or where there is a false 

ceiling which will not bear the upward force of liner (about 600 lbs), there are two methods for maintaining liner shape. 

b. Sandbagging. 

(1) Ensure all vents from PE to shelter are open. 

NOTE 

You will need 12 to 14 sandbags, depending on weight of each bag. When room liner pressure is 

0.6 iwg, you will need 600 lbs of sandbags. 

(2) Place sandbags (1) (Item 2, App D) inside liner. 

(3) Place sandbags evenly along outer edge of floor. 

(4) Adjust vents to proper pressures (para 2-8). 

2-63


c. Nailing. 

CAUTION 

Check pressure inside SCPE to be sure it does not exceed 1.20 iwg during and after nailing. 

Overpressure will pull out nails and cause the material to tear. 

NOTE 

Make sure that all vents from PE to shelter are fully opened. If liner is to be erected on a wooden 

floor, it can be held down by nailing strips of wood to floor through liner. 

(1) Place 12 strips of wood (1) (Item 8, App D), each 3 to 4 ft. long, evenly around perimeter of liner floor. 

(2) While inflating room liner, use hammer (Item 5, App D) to drive three or four nails (Item 9, App D) through 

each strip through room liner floor, and into room flooring. Be sure to nail wood strips on or near floor 

seam of room liner. 

(3) Adjust vents to proper pressure (para 2-8). 

2-64


2-15. INSTALLING M20A1 SCPE LINERS WITHOUT PRESSURIZATION. 

WARNING 

This procedure should be done only in a clean environment. Contamination of personnel by 

biological or chemical agents can cause serious injury, illness or, death. 

NOTE 

If room liner is going to be unpressurized for any reason while occupied, use the following steps 

to support the liner. 

a. Attach support lines (1) across center of room in a cross or "X' pattern at a height of approximately 7 to 10 feet. 

b. If only one support line (Item 7, App D) is used, run it from door opening to opposite side of room. 

c. Secure all support lines (1) to room walls by any means available. 

d. Aline room liner door (2) with room door (3). 

e. Attach liner, center row of ties (4), to passive support line (1) going from door opening (3) to opposite side of 

room. 

f. Attach remaining liner ties (5) to additional support lines (1). 

2-65


2-16. DEPLOYING M20A1 SCPE IN AN NBC ENVIRONMENT. 

WARNING 

Failure to comply with the following steps when installing the M20A1 SCPE in an NBC 

environment can result in contamination of personnel by biological or chemical agents and 

cause serious injury, illness, or death. 

CAUTION 

DS2 should not be used to decontaminate the liner. This may cause damage to the liner. 

NOTE 

Install the M20A1 SCPE (par 2-8) strictly adhering to the following additional steps. 

a. Decontaminate all contaminated personnel and equipment in accordance with FM 3-5 and unit SOP. 

b. Liner may be inflated without exterior ties and support lines. 

c. Equipment must be carried in prior to liner inflation. 

d. Using the M256AI kit (App D, item 4), ensure liner is completely purged of all contaminants prior to unmasking. 

e. Turn on recirculation filter. 

2-66


CHAPTER 3 

MAINTENANCE INSTRUCTIONS 

Section I. LUBRICATION INSTRUCTIONS 

3-1. LUBRICATION. 

The M20A1 SCPE requires no lubrication. 

3-2. INTRODUCTION. 

Section II. TROUBLESHOOTING 

a. The troubleshooting table lists common malfunctions which you may find during the operation of the SCPE or its 

components. You should perform the test/inspection and corrective action in the order listed. 

b. This manual cannot list all malfunctions that may occur, nor all test or inspections and corrective actions. 

If a malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor. 

c. Only those corrective procedures that can be performed by operator are listed in the table. 

d. Use the following symptom index to locate troubleshooting procedures. 

SYMPTOM INDEX 

Malfunction Symptom 

Troubleshooting 

Procedure 

Page 

1. PRESSURE LOW IN LINER. 3-2 

2. PRESSURE LOW IN PE. 3-3 

3. BLOWER DOES NOT OPERATE. 3-4 

4. RECIRCULATION FILTER DOES NOT OPERATE. 3-4 

5. DOME LIGHT IN PE NOT WORKING. 3-4 

3-1


TROUBLESHOOTING 

MALFUNCTION 

TEST OR INSPECTION 

CORRECTIVE ACTION 

1. PRESSURE LOW IN LINER. 

Step 1. Check to see if blower has stopped. 

See malfunction 3. 

Step 2. Check for improper adjustment of vents on PE doors. 

Properly adjust vents (para 2-8h). 

Step 3. Check to see if tubing is securely connected to the gage and outlet port. 

Securely connect tubing. 

Step 4. Check to see if PE doors are not completely closed. 

Properly close PE doors. 

Step 5. Check for punctures or tears in PE. 

Seal as required to stop air leakage (para 3-3). 

Step 6. Check for improper hook-and-pile seal between PE and room liner. 

Open PE door to liner and one outer PE door to reduce pressure, then reseal 

hook-and-pile fasteners. 

Step 7. Check for improper hook-and-pile seal between liners and room adapter. 

Seal as required to stop air leakage. 

Step 8. Check for improper attachment of ECU adapter. 

Properly attach ECU adapter (para 2-8). 

Step 9. Check that all duct sleeves and cable are closed. 

Properly close all duct sleeves and cable sleeves (para 2-8). 

3-2


TROUBLESHOOTING (CONT) 

MALFUNCTION 



Step 10. Check for punctures or tears in liners (top, bottom, and sides). 

Seal as required to stop air leakage (para 3-3). 

Step 11. Check air ducts for punctures, tears, or improper connection. 

Restore ducts to operational condition (para 3-3). Properly connect air ducts (para 2-8). 

Step 12. Check air ducts and HSFC for obstructions. 

Remove obstructions. 

Step 13. Notify unit maintenance. 

2. PRESSURE LOW IN PE. 

Step 1. Check to see if blower has stopped. 

See malfunction 3. 

Step 2. Check for improper adjustment of vents on PE doors. 

Properly adjust vents (para 2-8). 

Step 3. Check to see if tubing is securely connected to the gage and outlet port. 

Securely connect tubing. 

Step 4. Check to see if PE doors are properly closed. 

Properly close PE doors. 

Step 5. Check for punctures or tears in PE. 

Seal to stop air leakage (para 3-3). 

Step 6. Check air ducts for punctures, tears, or improper connection. 

Restore ducts to operational condition (para 3-3). Properly connect air ducts (para 2-8). 

Step 7. Check air ducts and HSFC for obstructions. 

Remove obstructions. 

Step 8. Notify Unit Maintenance. 

3-3


MALFUNCTION 



TROUBLESHOOTING (CONT) 

3. BLOWER DOES NOT OPERATE. 

Step 1. Check for disconnected input power cable. 

Connect input power cable. 

Step 2. Check to see if blower switch is in up (on) position. 

Cycle switch to full down (off) position then to up (on) position. 


4. RECIRCULATION FILTER DOES NOT OPERATE. 

Step 1. Check for disconnected input power cable. 

Re-connect input power cable. 

Step 2. Check to see if recirculation filter blower power switch is in up (on) position. 

Switch power switch to up (on) position. 


5. DOME LIGHT IN PE NOT WORKING. 

Step 1. Check to see if blower switch is in up (on) position. 

Cycle switch to full down (off) position then switch to up (on) position. 

Step 2. Check for disconnected or improperly connected electrical cables or cords. 

Properly connect electrical cables and cords (para 2-8). 


3-4


Section III. MAINTENANCE PROCEDURES 

3-3. OPERATOR MAINTENANCE. 

Operator maintenance is limited to inspection and repair of room liner fabric components, and replacing hose 

adapter and filter adapter gaskets. 

a. Inspecting. Inspect components of the SCPE as described in PMCS (para 2-5). 

b. Repairing. Room liners, PE fabric, ECU adapter duct and air duct hoses can be restored to operating condition 

using tape from accessory package. 

To repair straight tears on room liner, ECU adapter duct and PE fabric. 

NOTE 

Silicone is applied to the zippers to permit easier opening and closing. The repair tape will not 

stick to areas covered with silicone. 

(1) If the area to be repaired is near the zippers use alcohol (Item 1, App D) and a wiping rag (Item 10, App D) 

to clean surface prior to taping. 

(2) Cut or tear a strip of tape (Item 12, App D), stored in the accessory package, approximately 4 inches 

longer than damaged area. 

(3) Position tape over damaged area, pressing firmly in place from top to bottom. 

(4) Use cross strips of tape for added strength. 

To repair corner cuts or punctures on room liners, ECU adapter duct, and PE fabric. 

(1) Using pocket knife, (Item 6, App D) cut repair material, located in accessory package, large enough to 

cover damaged area. 

(2) Cut or tear a strip of tape approximately 4 inches longer than patch. 

(3) Position patch on damaged area and firmly press tape around the edges. 

3-5


3-3. OPERATOR MAINTENANCE (CONT). 

To repair damaged air ducts. 

(1) Cut or tear a piece of tape 4 inches longer than cut or slit. 

(2) Position tape on outside of duct and press firmly in place. For added strength position extra tape 

completely around taped area of duct. 

c. Replacing Gaskets. This procedure is used for the hose adapter and the filter adapter. 

(1) Remove old gasket (1 or 2). 

(2) Using knife (Item 6, App D), scrape old adhesive and gasket material from the adapter surface. 

(3) Peel away backing tape from new adapter gasket. 

(4) Position gasket on adapter (3) with adhesive side toward hose; press firmly in place. 

3-6


APPENDIX A 

REFERENCES 

A-1. 

SCOPE 

This appendix lists all technical manuals, field manuals, DA Pamphlets, forms, and bulletins in this manual. 

A-2. 

TECHNICAL MANUALS 

Destruction of Chemical Weapons and Defense Equipment to Prevent Enemy Use...................... TM 43-0002-31 

Chemical, Toxicological and Missile Fuel Handler Protective Clothing .......................................... TM 10-277 

Operator/Crew, Organizational, Intermediate (Field) (Direct Support and 

General Support) and Depot Maintenance Manual for Generator Set, 

Gasoline Engine Driven, Skid Mounted, Tubular Frame ................................................... TM 5-6115-323-14 

A-3. FIELD MANUALS 

NBC Protection ...................................................................................................................... FM 3-4 

NBC Decontamination................................................................................................................... FM 3-5 

First Aid for Soldiers ..................................................................................................................... FM 21-11 

A-4. DA PAMPHLETS 

The Army Maintenance Management System (TAMMS) .. ............................................................ DA PAM 738-750 

Functional Users Manual for the Army Maintenance Management 

System-Aviation (TAMMS-A............................................................................................. DA PAM 738-751 

A-5. DA FORMS 

Recommended Changes to Equipment Technical Publications ..................................................... DA FORM 2028-2 

Equipment Inspection and Maintenance Worksheet ...................................................................... DA FORM 2404 

A-6. STANDARD FORMS 

Quality Deficiency Report.............................................................................................................. SF 368 

Report of Discrepancies ................................................................................................................ SF 364 

A-7. OTHER 

Common Table of Allowances ...................................................................................................... CTA 8-100/ 

CTA 50-970 

A-1/(A-2 blank)


APPENDIX B 

COMPONENTS OF END ITEM 

AND 

BASIC ISSUE ITEMS LIST 

Section I. INTRODUCTION 

C-1. 

SCOPE 

This appendix lists components of the end item and basic issue items for the M20AI Simplified Collective Protection 

Equipment (SCPE) to help you inventory the items for safe and efficient operation of the equipment. 

C-2. 

GENERAL 

The Components of End Item and Basic Issue Items (BII) Lists are divided into the following sections: 

a. Column (1), Illus Number, gives you the number of the item illustrated. 

b. Column (2), National Stock Number, identifies the stock number of the item to be used for requisitioning 

purposes. 

c. Column (3), Description and Usable On Code, identifies the Federal item name followed by a minimum 

description when needed. The last line below the description is the CAGEC (commercial and Government entity code) in 

parenthesis and the part number. 

d. Column (4), U/I (unit of issue), indicates how the item is issued for the National Stock Number shown in column 

two. 

e. Column (5), Qty Rqd, indicates the quantity required. 

B-1


Section II. COMPONENTS OF END ITEM 

(1) (2) (3) (4) (5) 

Illus National Stock Description Usable on Qty 

Number Number CAGEC and Part Number Code U/I Rqr 

1 4240-01-331-0170 Room SCPE Liner Package EA 1 

(81361) 5-19-11334 

2 4240-01-331-2938 Pressurized Protective Entrance EA 1 

(81361) 5-19-11021 

3 N/A Accessory Package EA 1 

(81361) 5-19-11190 

4 4240-01-178-9936 Hermetically Sealed Filter Canister EA 1 

(81361) 5-19-6868 

5 4240-01-348-5257 Recirculation Filter EA 1 

(81361) 5-19-10878 

On-board Spares 

1 4240-01-331-0170 Room SCPE Liner Package EA 2 

(81361) 5-19-11334 

B-2


Section III. BASIC ISSUE ITEMS 

(1) (2) (3) (4) (5) 

Illus National Stock Description Usable on Qty 

Number Number CAGEC and Part Number Code U/I Rqr 

TECHNICAL MANUAL: EA 1 

Operator's Manual, Simplified Collective 

Protection Equipment: NBC, M20A1, 

TM 34240-313-10 

B-3/(B-4 blank)


APPENDIX C 

ADDITIONAL AUTHORIZATION LIST 

Section I. INTRODUCTION 

C-1. 

SCOPE 

This appendix lists additional items you are authorized for the support of the M20A1 NBC Simplified Collective Protection 

Equipment (SCPE). 

C-2. 

GENERAL 

This list identifies items that do not have to accompany the M20A1 NBC SCPE and do not have to be turned in with it. 

These items are authorized to you by CTA, MTOE, TDA, or JTA. 

C-3. 

EXPLANATION OF LISTING 

National stock numbers, descriptions, and quantities are provided to help you identify and request the additional items 

you require to support this equipment. The items are listed in alphabetical sequence by item name. If the item you 

require differs between serial numbers of the same model, effective serial numbers are shown in the last line of the 

description. If item required differs for different models of this equipment, the model is shown under the 'USABLE ON 

CODE" heading in the description column. 

Section II. ADDITIONAL AUTHORIZATION LIST 

(1) (2) (4) (5) 

National Description 

Stock CAGEC and Qty 

Number Part Number Usable on Code U/I Rqr 

MTOE Authorized Items 

4240-01-331-3253 ADAPTER, HORIZONTAL, ECU EA 1 

(81361) 5-19-11381-20 

4240-01-331-0170 ADAPTER, VERTICAL, ECU EA 1 

(81361) 5-19-11381-10 

6115-01-150-4140 GENERATOR SET, DIESEL EA 1 

ENGINE, 3 Kw 

(30554) MEP-016B 

C-1/(C-2 blank)


APPENDIX D 

EXPENDABLE AND DURABLE ITEMS LIST 

D-1. 

SCOPE 

This appendix lists expendable and durable items that you will need to operate and maintain the M20A1 NBC Simplified 

Collective Protection Equipment (SCPE). This listing is for information only and is not authority to requisition the listed 

items. These items are authorized to you by CTA 50-970, Expendable/Durable Items (except medical, class V repair 

parts, and heraldic items), or CTA 8-100, Army Medical Department Expendable/Durable Items. 

D-2. 

EXPLANATION OF COLUMNS 

a. Column 1. Item Number. This number is assigned to the entry in the listing and is referenced in the narrative 

instructions to identify the item (e.g. "Use pocket knife, Item 6, Appendix D"). 

b. Column 2. Level. This column identifies the lowest level of maintenance that requires the item. 

c. Column 3. National Stock Number. This is the national stock number assigned to the item which you can use 

to requisition it. 

d. Column 4. Item Name, Description, Commercial and Government Entity Code (CAGEC), and Part 

Number. This provides the other information you need to identify the item. 

e. Column 5. Unit of Measure. This code shows the physical measurement or count of an item, such as gallon, 

dozen, gross, etc. 

Section II. EXPENDABLE/DURABLE ITEMS LIST 

(1) (2) (3) (4) (5) 

Item National ITEM NAME, DESCRIPTION 

Number Level Stock Number CAGEC AND PART NUMBER U/M 

1 C 6510-01-091-8200 ALCOHOL: PAD, ISOPROPYL EA 

swab, 1.75 in. width x 1.75 in. length 

(24065) MA-24-80 

2 C 8105-01-142-9345 BAG, SAND: plastic, poly- EA 

propylene, single wall 

(81349) MIL-B-52472 

3 C 4230-01-101-3984 DECONTAMINATING KIT: EA 

M258A1 

(81361) 5-77-2366 

D-1


Section II. EXPENDABLE/DURABLE ITEMS LIST (CONT) 

(1) (2) (3) (4) (5) 

Item National ITEM NAME, DESCRIPTION 

Number Level Stock Number CAGEC AND PART NUMBER U/M 

4 C 6665-01-133-4964 DETECTOR KIT: M256A1 EA 

(81361) D5-77-2240 

5 C 5120-00-900-6110 HAMMER, HAND: E22, EA 

carpenters 

(81348) GGG-H-86 

6 C 5110-00-162-2205 KNIFE, POCKET EA 

(81349) MIL-K-818C 

7 C 8340-00-252-2297 LINE, TENT FT 

(81349) MIL-L-1709 Class A 

8 C 5510-00-272-9060 LUMBER, SOFTWOOD, BOARD: BF 

30 ft., 1 in. thick by 3 in. wide by 

6 ft. random length 

(81349) MIL-B-52472 

9 C 5315-00-753-3883 NAIL: 3 in. length, 5 lb. LB 

(81348) FF-N-105 

10 C 7920-00-205-1711 RAG, WIPING: 50 lb. BE 

(58536) A-A-531 

11 C 5120-00-542-3438 SCREWDRIVER, CROSS TIP EA 

(81348) GGG-S-121 

12 C 7510-01-266-0326 TAPE, PRESSURE SENSITIVE RO 

(86984) PPP-T-60 

D-2


INDEX 

Subject 

Page 

A 

Abbreviations ...................................................................................................................................... 1-2 

Accessory Package 

Description .................................................................................................................................. 1-7 

Inspection Before Operation........................................................................................................ 2-10 

Inspection After Operation .......................................................................................................... 2-19 

Adapter Cables 

Connection.................................................................................................................................. 2-33 

Description .................................................................................................................................. 1-7 

Disconnect .................................................................................................................................. 2-45 

Inspection.................................................................................................................................... 2-10 

Additional Authorization List, Appendix C............................................................................................ C-1 

Adjusting Internal Pressure ................................................................................................................. 2-36 

Air Duct 

Assembling with HSFC and Motor Blower ................................................................................... 2-31 

Disconnect .................................................................................................................................. 2-46 

Functional Description ................................................................................................................ 1-10 

Inspection Before Operation ....................................................................................................... 2-12 

Repair ......................................................................................................................................... 3-5 

B 

Basic Issue Items ............................................................................................................................... B-3 

Bell Timer (see Interval Timer) 

Blower 

Controls and Indicators ............................................................................................................... 2-2 

Decals and Instruction Plates ...................................................................................................... 2-60 

Disconnect .................................................................................................................................. 2-45 


HSFC, Assembling ..................................................................................................................... 2-28 


Inspection Before Operation........................................................................................................ 2-11 

Inspection During Operation ....................................................................................................... 2-16 

C 

Characteristics, Capabilities, and Features, Equipment ...................................................................... 1-3 

Components of End Item .................................................................................................................... B-2 

Components of End Item and Basic Issue Items, Appendix B.............................................................. B-I 

Controls and Indicators........................................................................................................................ 2-1 

Corrosion Data Feedback ................................................................................................................... 1-2 

Index-1

Subject 

D 


Page 

Decals and Instruction Plates, Operating Instructions ......................................................................... 240 

Decontaminating SCPE ...................................................................................................................... 2-45 

Deploying SCPE in NBC Environment ............................................................................................... 2-66 

Destruction of Army Material to Prevent Enemy Use .......................................................................... 1-1 

Differences Between Models............................................................................................................... 1-8 

Differential Pressure Gage (see Gage) 

Dimensions and Weights .................................................................................................................... 1-9 

Disassembly of SCPE ........................................................................................................................ 245 

Dome Light 



E 

ECU Adapter 

Description .................................................................................................................................. 1-8 

Installation, Horizontal................................................................................................................. 2-38 

Installation, Vertical .................................................................................................................... 2-40 

Striking, Horizontal...................................................................................................................... 2-53 

Striking, Vertical.......................................................................................................................... 2-55 

Entry Procedures, Protective Entrance ............................................................................................... 2-43 

Equipment Characteristics, Capabilities, and Features ....................................................................... 1-3 

Equipment Data ................................................................................................................................. 1-9 

Equipment Improvement Recommendations, Reporting...................................................................... 1-1 

Exit Procedures, Protective Entrance.................................................................................................. 244 

Expendable/Durable Supplies and Materials List, Appendix D ............................................................ D-1 

Extension Light 

Description .................................................................................................................................. 1-7 



Removing ................................................................................................................................... 2-46 

F 

Features, Capabilities, Characteristics, Equipment ............................................................................. 1-3 

Filters (see Recirculation Filter; HSFC) 

Folding Room Liners .......................................................................................................................... 2-58 

Forms and Records, Maintenance....................................................................................................... 1-1 

Functional Description of Major Components ..................................................................................... 1-10 

Index-2

Subject 

G 


Page 

Gage 




H 

HSFC 

Crating ........................................................................................................................................ 2-47 

Decals and Instruction Plates ..................................................................................................... 2-60 

Description ................................................................................................................................. 1-6 




Motor Blower, Assembling .......................................................................................................... 2-31 

Hermetically Sealed Filter Canister (see HSFC) 

High Ceilings, M20A1 SCPE, Used in Areas With .............................................................................. 2-63 

I 

Inflating Room Liner ........................................................................................................................... 2-34 

Inflating Room Liner in NBC Environment .......................................................................................... 2-66 

Initial Adjustment and Daily Checks ................................................................................................... 2-21 

Initial Condition M20A1 SCPE ............................................................................................................ 2-21 

Installation, M20AI Room Liner .......................................................................................................... 2-22 

Installation in NBC Environment ......................................................................................................... 2-66 

Installing Liners Without Pressurization .............................................................................................. 2-65 

Internal Pressure, Adjusting ................................................................................................................ 2-36 

Interval Timer 




L 

Liner (see Room Liner) 

Location and Description of Major Components .................................................................................. 1-4 

Lubrication .......................................................................................................................................... 3-1 

INDEX-3


Subject 

Page 

M 

Maintenance Forms and Records........................................................................................................ 1-1 

Maintenance Procedures .................................................................................................................... 3-5 

Major Components 


Location and Description ............................................................................................................ 1-4 

Malfunctions ....................................................................................................................................... 3-1 

Model Differences .............................................................................................................................. 1-8 

Motor Blower Assembly (see Blower) 

Movement, Preparation for ................................................................................................................. 2-44 

N 

Nailing................................................................................................................................................. 2-64 

NBC Environment, Deploying SCPE .................................................................................................. 2-66 

Nomenclature Cross-Reference ......................................................................................................... 1-2 

O 

Operating Instructions on Decals and Instruction Plates ...................................................................... 2-60 

Operating Power Requirements .......................................................................................................... 1-9 

Operating Procedures ........................................................................................................................ 2-43 

Operation Under Unusual Conditions ................................................................................................. 2-62 

Operation Under Usual Conditions ..................................................................................................... 2-21 

Operator Controls and Indicators ........................................................................................................ 2-2 

Operator Preventive Maintenance Checks and Services (see PMCS) 

Operator Troubleshooting Procedures ................................................................................................ 3-1 

P 

PMCS ................................................................................................................................................ 2-5 

PMCS 

After............................................................................................................................................ 2-18 

Before ........................................................................................................................................ 2-6 

During ........................................................................................................................................ 2-14 

Power Cables 

Connection.................................................................................................................................. 2-33 

Description .................................................................................................................................. 1-7 

Disconnection.............................................................................................................................. 2-45 

Inspection ................................................................................................................................... 2-11 

Power Requirements .......................................................................................................................... 1-9 

Preparation for Movement .................................................................................................................. 244 

Preparation and Assembly for Use ...................................................................................................... 2-21 

Pressure Gage (see Gage) 

INDEX-4


Subject 

P (CONT) 

Page 

Pressure, Adjusting Internal ................................................................................................................ 2-36 

Pressurized, Installing Without ........................................................................................................... 2-65 

Pressurized Protective Entrance (see Protective Entrance) 

Preventive Maintenance Checks and Services, Operator (see PMCS) 

Principles of Operation, Technical ...................................................................................................... 1-10 

Procedures 

Assembly .................................................................................................................................... 2-21 

Maintenance................................................................................................................................ 3-5 

Operating .................................................................................................................................... 2-43 

Protective Entrance Entry ........................................................................................................... 2-43 

Protective Entrance Exit ............................................................................................................. 2-44 



Decals and Instruction Plates ..................................................................................................... 2-60 

Description .................................................................................................................................. 1-5 

Disassembling............................................................................................................................. 245 

Entry Procedures ........................................................................................................................ 2-43 

Exit Procedures .......................................................................................................................... 2-44 

Fabric Repair ............................................................................................................................. 3-5 


Inspection Before Operation........................................................................................................ 2-7 



Installing ..................................................................................................................................... 2-24 

Striking........................................................................................................................................ 2-48 

R 

Recirculation Filter 


Description .................................................................................................................................. 1-6 


Installing...................................................................................................................................... 2-34 




Removal ..................................................................................................................................... 2-53 

Records and Forms, Maintenance ...................................................................................................... 1-1 

References, Appendix A ..................................................................................................................... A-1 

Repair Procedures ............................................................................................................................. 3-5 

Reporting Equipment Improvement Recommendations ...................................................................... 1-1 

Room Liner 

Description ................................................................................................................................. 1-4 

Folding........................................................................................................................................ 2-58 


Inflating ....................................................................................................................................... 2-34 

INDEX-5


Subject 

Page 

R (CONT) 

Inflating in NBC Environment ..................................................................................................... 266 

Inspection After Operation........................................................................................................... 2-18 



Installing...................................................................................................................................... 2-22 

Repair ......................................................................................................................................... 3-5 

Striking........................................................................................................................................ 2-57 

S 

Sandbagging....................................................................................................................................... 2-63 

SCPE Liners (see Room Liner) ........................................................................................................... 

Striking SCPE .................................................................................................................................... 2-45 

Support Kit (see Accessory Package) 

Symptom Index .................................................................................................................................. 3-1 

System Description ............................................................................................................................ 1-10 

T 

Technical Principles of Operation........................................................................................................ 1-10 

Timer Bell (see Interval Timer) 

Troubleshooting Procedures, Operator................................................................................................ 3-1 

V 

Vents 

Adjusting Internal Pressure ......................................................................................................... 2-36 


W 

Weights and Dimensions .................................................................................................................... 1-9 

INDEX-6

TM 3-4240-313-10 OPERATOR'S MANUAL SIMPLIFIED ...

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