TO 1-1-700 - Robins Air Force Base

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TO 1-1-700 nance manual and/or the item specifications and drawings. 6.3 MOISTURE AND FUNGUS RESISTANT VARNISH TREATMENT OF GROUND COMMUNICATIONS, ELECTRONIC, METEOROLOGICAL (C-E-M) AND ASSOCIATED ELECTRICAL EQUIPMENT. 6.3.1 Retreatment Criteria. Equipment shall be examined and retreated if its condition can be classified under one of the following criteria: 6.3.1.1 The equipment shows evidence of any type of deterioration whether previously treated or not. 6.3.1.2 During the process of repair, the equipment has been subjected to abrasion by sanding or blasting of any nature. 6.3.1.3 The presence of white powdery oxide deposits on aluminum alloy or cadmium-plated parts that interfere with proper operation of the equipment thus requiring some disassembly or overhaul. NOTE The presence of these deposits in itself will not constitute reason for disassembly or overhaul unless they specifically interfere with proper operation of the equipment. Open air, glove box, and walk-in booth operations will be evaluated by the safety officer and the bioenvironmental engineer to ensure personnel safety. • The use of sand, carborundum, aluminum oxide, or steel grit should be avoided since abrasive material of this type may enter moving parts and cause jamming or excessive wear. Any conductive types of these materials remaining in equipment may also impair its electrical operation. • When plastic media is used, use only MIL-P- 85891, Type V as all other types are too hard and can damage the substrate. NOTE A-A-1722, Type II black walnut shells are available through Air Force supply in a 50 lb. Bag under NSN 5650-00-050-1094, and MIL-P-85891, Type V plastic media is available through Air Force supply in a 250 lb. bag under NSN 5650-01-327-8461. 6.3.2.1 Varnish Treatment Removal. Remove old existing varnish by abrasive blasting with abrasive material such as ground black walnut shells conforming to A-A-1722, Type II or plastic media conforming to MIL-P-85891, Type V per procedures in Chapter 2 of TO 1-1-8 for process guidelines. MIL-DTL-81706 (ALODINE), COATING, CHEMICAL CONVERSION 23 6.3.1.4 The presence of white powdery oxide deposits on aluminum alloy or cadmium-plated parts that do not interfere with proper operation of the equipment requires only brushing off accessible oxide deposits with a non-metallic (nonabrasive) stiff bristle brush and treatment of affected surfaces with MIL-DTL-81706 (MIL-DTL-5541), Class 1A, Form VI, Method D solution (Touch-N-Prep/TNP pen method) per Section II of Chapter 5 in TO 1-1-691. 6.3.2 Cleaning. MIL-P-85891, GRAIN, ABRASIVE 36 Use of compressed air for cleaning can create airborne particles which may enter the eyes and cause serious injury. Effective chip guarding including eye protection is required. Excessive air pressures or a concentrated blast stream can damage insulation and delicate electronic parts. This will be avoided during the cleaning process. Air pressure for cleaning shall be limited to a pressure of 30 PSI at the nozzle. The nozzle diameter shall be 1/4 inch minimum. 6.3.2.2 Final Cleaning and Debris Removal. Remove all loose dirt, dust, abrasive debris, and any grease or oil as follows: 6-4 Change 1
TO 1-1-700 a. After first directing blast of air at floor to clear any condensed moisture from the air line, blow air over all surfaces or use a commercial grade wet/dry vacuum to remove all loose dirt, dust, and abrasive debris. 6.4.1.5 Screw threads and screw adjustments, normally moved in process of operation or adjustments. 6.4.1.6 Springs, except at base of pile up. 6.4.1.7 Surfaces whose operating temperatures exceed 302 °F (150 °C) or will cause carbonization or smoking. TT-N-95, NAPHTHA, ALIPHATIC 66 6.4.1.8 Transparent plastic parts. 6.4.1.9 Windows, lenses, etc. 6.4.1.10 Cable with plastic or rubber insulation. TT-I-735, ALCOHOL, ISOPROPYL 65 b. Clean any oil, grease, or residual treatment from the metal parts by wiping with a soft cloth wet with a 50/50 by volume mixture of TT-N-95 Aliphatic Naphtha and TT-I-735 Isopropyl Alcohol, and dry them by wiping with a clean, dry cloth. c. Clean any remaining visible resin deposits from areas where soldering operations will be conducted by scraping or chipping. 6.4 PREPARATION FOR RETREATMENT. After all repairs and refinishing in accordance with Chapters 7 and 8 of this manual and TOs 1-1-8, 1-1-689-series, 1-1-691 31-1-69, 31-1-75, 35E4-1-162, and all applicable equipment system specific maintenance manuals have been completed, reassemble equipment as far as practicable while still allowing complete coverage of required areas. Sometimes, it is better to coat subassemblies with varnish prior to assembly to provide better coverage and/or aid in application. 6.4.1 Masking. Mask all surfaces or parts where such application of the varnish coating will interfere with operation or performance of equipment. The following are examples of surfaces which are NOT to be treated by the method specified herein: 6.4.1.1 Contact portion of binding posts, connectors, fuses, jacks, keys, plugs, relay, sockets, switches, test points, and variable capacitors. 6.4.1.2 Surfaces which rub together for electrical or magnetic contact such as those in contact fingers, potentiometers, shafts, shields, variable autotransformers, and relays. 6.4.1.3 Bearing surfaces, including bearing surfaces of gaskets and sliding surfaces. 6.4.1.4 Bearings, gear teeth, and gear trains of assemblies. 6.4.1.11 Capacitors - variable, air, ceramic, or micadielectric types. 6.4.1.12 Ceramic insulators subject to 600 V operating voltage, where danger of flashover exists. 6.4.1.13 Materials when used for their specific ARC-RESIS- TANT properties and classified as ARC-RESISTANT in applicable material specifications. 6.4.1.14 Painted, lacquered, or varnished exterior surfaces. 6.4.1.15 Pins, mating surfaces, and threads of plugs, plugconnectors, tube sockets, etc. 6.4.1.16 Resistors where heat dissipation is undesirably affected and where coating material may become carbonized. 6.4.1.17 Rotating equipments, dynamotors, generators, motors, etc., however, their associated electronic components such as filter units, etc., shall be treated according to requirements specified herein. 6.4.1.18 Wave guides and R.F. plumbing, in particular on mating flange areas, where the varnish coating may be detrimental to proper functioning, cause an improper VSWR to develop, and/or attenuate signals to a greater than allowable degree. 6.4.1.19 The exterior, visible outside portions of indicating instruments and control boxes. 6.4.2 Drying of Equipment. Apply the varnish coating only on dry surfaces and never on wet or damp surfaces. Dry equipment by heating it to 120 °F to 140 °F (49 °C to 60 °C) for a minimum period of 1/2 hour but no longer than 3 hours to substantially dehydrate equipment, and allow it to cool below 100 °F (38 °C) prior to varnish coating application. 6.4.3 Methods of Treatment. Use the following techniques and criteria for application of the varnish coating: 6-5
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TO 1-1-700 TECHNICAL MANUAL CORROSI
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TO 1-1-700 TABLE OF CONTENTS Chapte
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TO 1-1-700 TABLE OF CONTENTS - CONT
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TO 1-1-700 LIST OF ILLUSTRATIONS -
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TO 1-1-700 FOREWORD 1. PURPOSE. The
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TO 1-1-700 List of Related Publicat
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TO 1-1-700 SAFETY SUMMARY 1. GENERA
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TO 1-1-700 AMS-G-6032, GREASE, PLUG
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TO 1-1-700 MIL-DTL-64159, COATING,
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TO 1-1-700 MIL-PRF-27617, GREASE, A
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TO 1-1-700 O-L-164, DRESSING, LEATH
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TO 1-1-700 MIL-T-81772, THINNER, PO
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TO 1-1-700 tronics equipment and th
Page 34 and 35: TO 1-1-700 cleaning situation, syst
Page 36 and 37: TO 1-1-700 c. Riveted joints shall
Page 38 and 39: TO 1-1-700 c. Remove and replace an
Page 40 and 41: TO 1-1-700 MIL-L-87177, LUBRICANT,
Page 42 and 43: TO 1-1-700 Figure 3-1. Simplified C
Page 44 and 45: TO 1-1-700 resistant, and also at t
Page 46 and 47: TO 1-1-700 is first noticeable as a
Page 48 and 49: TO 1-1-700 3.7.8 Oxygen Concentrati
Page 50 and 51: TO 1-1-700 Figure 3-14. Concentrati
Page 52 and 53: TO 1-1-700 Figure 3-17. Galvanic Se
Page 54 and 55: TO 1-1-700 Figure 3-20. Aluminum Su
Page 56 and 57: TO 1-1-700 3.8.7 CRES/Stainless Ste
Page 58 and 59: TO 1-1-700 3.9.10 Climate. Warm, mo
Page 60 and 61: TO 1-1-700 3.11 PREVENTATIVE MAINTE
Page 63 and 64: TO 1-1-700 CHAPTER 4 COMPOSITE AND
Page 65 and 66: TO 1-1-700 4.4.4.4 Glass parts shal
Page 67 and 68: TO 1-1-700 CHAPTER 5 PACKAGING (STO
Page 69 and 70: TO 1-1-700 extent of damage dependi
Page 71 and 72: TO 1-1-700 5.15 PRECAUTIONS FOR VCI
Page 73 and 74: TO 1-1-700 c. Secure the desiccant
Page 75 and 76: TO 1-1-700 Figure 5-8. Shock Isolat
Page 77 and 78: TO 1-1-700 Figure 5-9. Examples of
Page 79 and 80: TO 1-1-700 5.24.10 Rigid or Flexibl
Page 81 and 82: TO 1-1-700 CHAPTER 6 MOISTURE AND F
Page 83: TO 1-1-700 c. 6.2.6 Felt. Examine f
Page 87: TO 1-1-700 6.4.5.14 Terminals, scre
Page 90 and 91: TO 1-1-700 NOTE • Authorized clea
Page 92 and 93: TO 1-1-700 Table 7-1. Cleaning of S
Page 102 and 103: TO 1-1-700 7.3.1.2.3 Portable, 45 g
Page 104 and 105: TO 1-1-700 Table 7-2. Common Milita
Page 106 and 107: TO 1-1-700 inactivity, storage, or
Page 108 and 109: TO 1-1-700 7.5.6.5.1 Grade 1 - A th
Page 110 and 111: TO 1-1-700 Table 7-4. Corrosion Pre
Page 112 and 113: TO 1-1-700 Table 7-5. Preservation
Page 114 and 115: TO 1-1-700 either case, MIL-PRF-269
Page 116 and 117: TO 1-1-700 MIL-PRF-85285, COATING,
Page 118 and 119: TO 1-1-700 c. Cadmium plated surfac
Page 120 and 121: TO 1-1-700 a. Scuff sand and feathe
Page 122 and 123: TO 1-1-700 7.7.7.2 If surface is no
Page 124 and 125: TO 1-1-700 7.7.9.2 Where only parti
Page 126 and 127: TO 1-1-700 7.8.1 Type I Application
Page 128 and 129: TO 1-1-700 Extend (Loctite) 32150 J
Page 130 and 131: TO 1-1-700 There are three ways to
Page 132 and 133: TO 1-1-700 vulnerable surfaces clea
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TO 1-1-700 Table 8-2. Materials, Th
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TO 1-1-700 Table 8-4. Electronic Cl
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TO 1-1-700 Table 8-5. Accessories o
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TO 1-1-700 Table 8-5. Accessories o
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TO 1-1-700 f. Devices with permanen
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TO 1-1-700 Table 8-7. Cleaning and
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TO 1-1-700 MIL-PRF-87937, CLEANING
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TO 1-1-700 of contamination). Maint
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TO 1-1-700 8.8.2 Protective Coating
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TO 1-1-700 • Tube clamps. • Min
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TO 1-1-700 a. For bonding/grounding
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TO 1-1-700 vertently destroy the mo
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TO 1-1-700 doors, and other corrosi
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TO 1-1-700 CHAPTER 10 CORROSION PRO
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TO 1-1-700 MIL-PRF-81733, SEALING A
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TO 1-1-700 d. After corrosion is re
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TO 1-1-700 (3) Stainless/CRES steel
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TO 1-1-700 10.9 WATER ENTRAPMENT AR
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TO 1-1-700 f. Shield equipment from
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TO 1-1-700 b. Use e-inch rivnuts of
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TO 1-1-700 10.17.3 If the plating s
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TO 1-1-700 Figure 10-16. Dissipatio
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TO 1-1-700 (2) If allowable damage
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TO 1-1-700 Table 11-1. Recommended
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TO 1-1-700 11.6 3M CO. SCOTCH-BRITE
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TO 1-1-700 11.11.2 Control of Mecha
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TO 1-1-700 11.12.2 Mechanical Damag
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TO 1-1-700 MIL-DTL-81706 (ALODINE),
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TO 1-1-700 11.13.2.3 Application of
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TO 1-1-700 only when there is no da
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TO 1-1-700 NOTE SEMCO PASA-JELL 101
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TO 1-1-700 (CRES), lead, ceramic, g
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TO 1-1-700 11.13.7.2 Treatment of C
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TO 1-1-700 MIL-A-46106, ADHESIVE/SE
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TO 1-1-700 Table 12-1. Sealing Comp
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TO 1-1-700 used to apply sealants i
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TO 1-1-700 Figure 12-2. Sealant App
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TO 1-1-700 Figure 12-4. Rivet Appli
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TO 1-1-700 Figure 12-6. Sealant Inj
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TO 1-1-700 below and adhere very po
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TO 1-1-700 Table 12-2. Time Require
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TO 1-1-700 Table 12-2. Time Require
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TO 1-1-700 of 20 to 25 seconds in a
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TO 1-1-700 d. Remove all uncured se
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TO 1-1-700 Figure 12-12. Typical Me
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TO 1-1-700 may be used for low temp
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TO 1-1-700 Figure 12-14. Sealing Pr
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TO 1-1-700 - Robins Air Force Base

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