TO 1-1-700 - Robins Air Force Base

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TO 1-1-700 MIL-PRF-87937, CLEANING COMPOUND, AIRCRAFT 52 MIL-PRF-85570, CLEANING COMPOUND, AIRCRAFT 51 a. Apply a solution of one part MIL-PRF-87937, Type IV, or MIL-PRF-85570, Type II, Cleaning Compound to ten parts distilled water. b. Scrub affected areas of parts with a non-abrasive cleaning and polishing pad, a CCC-C-46, Class 7 Cleaning Cloth, CCC-C-440 Cheese-Cloth, acid swabbing brush, toothbrush, or cotton tipped applicator. c. Wipe area with a CCC-C-46, Class 7 Cleaning Cloth. d. Rinse area with clean, fresh water and dry with a CCC- C-46, Class 7 Cleaning Cloth. 8.6.4 Drying Equipment and Procedures. Drying time depends on the complexity of the component and the moisture content or humidity of the air where the drying is being performed. Complex parts require longer drying times. Humid environments also cause longer drying times. Before drying, make sure all covers and lids are opened or removed. In addition, remove any masking agents (tapes, plastic bags) that may be present. 8.6.4.1 Air Drying. Air drying is usually adequate for housings, covers, and some hardware. This method is not considered adequate for more complex equipment or components that may contain cavities or moisture traps. 8.6.4.2 Hot Air Blower. The following procedures shall be used when drying equipment using a hot air blower: a. Blow off excess water with dry air or dry nitrogen at not more than 10 PSI pressure. Deflect air off interior back and sides of enclosure to diffuse jet. b. Dry the equipment with an A-A-59435 Hot Air Gun, or a Raychem part No. HT-900 Hot Air Gun, as appropriate. Surfaces should not be heated with the hot air gun above 130 ºF (54 °C) when drying equipment. 8.6.4.3 Circulating Air Drying Oven. The circulating air drying oven is used to dry small electrical and electronic components, such as unpressurized instruments, control boxes, PCBs, and similar devices. The circulating air drying oven shall never be operated above 130 °F (54 °C) when drying electronic equipment or components. Damage may result from overheating of discrete electronic circuit components. Procedures for the operation of the circulating air drying oven are as follows: a. Blow off excess water with dry air or dry nitrogen at no more than 10 PSI pressure. Deflect air off interior back and sides of enclosure to diffuse jet. b. Set the temperature control at a maximum of 130 °F (54 °C). c. Place the component(s) in the oven and close the door. If a timer is available, set it for approximately 3 to 4 hours. d. Upon completion of the drying cycle, remove the component(s). 8.6.4.4 Forced Air Drying Oven. The forced air drying oven is the most efficient of the drying ovens. This unit can be used to dry all types and sizes of equipment and components. The procedures for the operation of the forced air drying oven are a follows: a. Blow off excess water with not more than 10 PSI dry air pressure or dry nitrogen. Deflect air off interior, back, and sides of enclosure to diffuse jet. b. Set the temperature control at a maximum of 130 °F (54 °C). c. Place the component(s) in the oven and close the door. If a timer is available, set it for approximately 1 to 2 hours. Opening and closing the oven door during drying will increase the drying time slightly but not appreciably. This is considered one of the advantages of the forced air drying oven over the circulating air type. d. Upon completion of the drying cycle, remove the component(s). 8.6.4.5 Vented Drying Oven. Vented drying oven procedures are as follows: a. Blow off excess water with not more than 10 PSI dry air pressure or dry nitrogen. Deflect air off interior, back, and sides of enclosure to diffuse jet. b. Dry the equipment at approximately 130 °F (54 °C) for 3 to 4 hours. 8.6.4.6 Vacuum Drying Oven. Vacuum oven drying procedures are as follows: 8-30
TO 1-1-700 a. Blow off excess water with not more than 10 PSI dry air pressure or dry nitrogen. Deflect air off interior, back, and sides of enclosure to diffuse jet. b. Dry the equipment at approximately 130 °F (54 °C) and 26 inches of mercury (Hg) for 1 to 2 hours. 8.6.5 Preservatives. Surfaces and components not normally conformal coated or painted need preservation. Cleanliness and elimination of moisture are keys to avoiding corrosion. Since it is impossible to guarantee a dry, moisturefree environment, preservation of equipment is essential. In today's electronic systems, miniaturization has resulted in micro miniature circuits no longer than a pencil eraser. The slightest amount of corrosion can cause an entire system to fail. Preservation has become an essential part of the repair and maintenance of electronic systems. 8.6.5.1 When to Preserve. Preservatives should always be used: • After electronic cleaning or maintenance. • Prior to shipment. • On non-operating or idle equipment. • On equipment awaiting parts. • Whenever access for inspection is difficult or impossible without disassembly. • Whenever protective coatings require additional protection in difficult-to-protect areas. • After exposure to water, salt water, chemical agents, etc. • Whenever existing corrosion protection has failed. 8.6.5.2 What to Preserve. Preservatives should be used only where their application and maintenance will not hamper circuit or component operation. Most preservatives form a nonconductive film that acts to insulate two mating surfaces. For example, preservative on a relay's mating contacts will degrade operation of the relay. Each piece of electronic equipment should be inspected. Areas requiring preservation should be noted and preserved on a scheduled basis. 8.6.5.2.1 The following items may require preservation on a regular basis: • Hinges and door latches. • Electrical connectors and receptacles. • Shock mounts, rigid mounts, and associated hardware. • Any dissimilar metals not otherwise preserved. • Antenna mounts, brackets, and hardware. • Fasteners, screws, nuts, and bolts. • Terminal boards, bus bars, and junction boxes. • Lids on the interior or exterior of equipment that are susceptible to moisture. • Solder joints not otherwise conformal coated. • Unpainted brackets, racks, and shelving. • Unpainted equipment covers, lids, and chassis. • External and internal surfaces of coaxial connectors. • External surfaces of cooling system joints. • Grounding straps and wires. 8.6.5.2.2 The following items shall not be preserved or come in contact with preservatives: • Printed circuit boards that are conformal coated. • Nonmetallic surfaces such as acrylic control box faceplates. • Tunable capacitors and inductors. • Internal surfaces of waveguides. • Internal surfaces of tuned tanks. • Relay and circuit breaker contacts. • Fuses. 8.6.5.3 Preservative Materials. Preservatives may also act as water-displacing materials and lubricants. Table 8-8 contains a list of authorized preservative compounds for electronic equipment. 8.6.6 Lubricants. Lubrication of equipment performs several important functions. Not only does it prevent wear between moving parts, but it also provides a barrier against corrosive environments and chemically inhibits corrosion. Particular attention should be given to lubrication points, hinges, latches, lift rings, etc., for signs of lubricant breakdown (e.g. caking of grease, loss of oil or dry film lubricant, or evidence 8-31
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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
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TO 1-1-700 cleaning situation, syst
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TO 1-1-700 c. Riveted joints shall
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TO 1-1-700 c. Remove and replace an
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TO 1-1-700 MIL-L-87177, LUBRICANT,
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TO 1-1-700 Figure 3-1. Simplified C
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TO 1-1-700 resistant, and also at t
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TO 1-1-700 is first noticeable as a
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TO 1-1-700 3.7.8 Oxygen Concentrati
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TO 1-1-700 Figure 3-14. Concentrati
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TO 1-1-700 Figure 3-17. Galvanic Se
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TO 1-1-700 Figure 3-20. Aluminum Su
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TO 1-1-700 3.8.7 CRES/Stainless Ste
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TO 1-1-700 3.9.10 Climate. Warm, mo
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TO 1-1-700 3.11 PREVENTATIVE MAINTE
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TO 1-1-700 CHAPTER 4 COMPOSITE AND
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TO 1-1-700 4.4.4.4 Glass parts shal
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TO 1-1-700 CHAPTER 5 PACKAGING (STO
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TO 1-1-700 extent of damage dependi
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TO 1-1-700 5.15 PRECAUTIONS FOR VCI
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TO 1-1-700 c. Secure the desiccant
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TO 1-1-700 Figure 5-8. Shock Isolat
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TO 1-1-700 Figure 5-9. Examples of
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TO 1-1-700 5.24.10 Rigid or Flexibl
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TO 1-1-700 CHAPTER 6 MOISTURE AND F
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TO 1-1-700 c. 6.2.6 Felt. Examine f
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TO 1-1-700 a. After first directing
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TO 1-1-700 6.4.5.14 Terminals, scre
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TO 1-1-700 NOTE • Authorized clea
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TO 1-1-700 Table 7-1. Cleaning of S
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TO 1-1-700 7.3.1.2.3 Portable, 45 g
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TO 1-1-700 Table 7-2. Common Milita
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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
Page 134 and 135: TO 1-1-700 Table 8-2. Materials, Th
Page 136 and 137: TO 1-1-700 Table 8-4. Electronic Cl
Page 150 and 151: TO 1-1-700 Table 8-5. Accessories o
Page 152 and 153: TO 1-1-700 Table 8-5. Accessories o
Page 154 and 155: TO 1-1-700 f. Devices with permanen
Page 156 and 157: TO 1-1-700 Table 8-7. Cleaning and
Page 160 and 161: TO 1-1-700 of contamination). Maint
Page 162 and 163: TO 1-1-700 8.8.2 Protective Coating
Page 164 and 165: TO 1-1-700 • Tube clamps. • Min
Page 166 and 167: TO 1-1-700 a. For bonding/grounding
Page 168 and 169: TO 1-1-700 vertently destroy the mo
Page 170 and 171: TO 1-1-700 doors, and other corrosi
Page 173 and 174: TO 1-1-700 CHAPTER 10 CORROSION PRO
Page 175 and 176: TO 1-1-700 MIL-PRF-81733, SEALING A
Page 177 and 178: TO 1-1-700 d. After corrosion is re
Page 179 and 180: TO 1-1-700 (3) Stainless/CRES steel
Page 181 and 182: TO 1-1-700 10.9 WATER ENTRAPMENT AR
Page 183 and 184: TO 1-1-700 f. Shield equipment from
Page 185 and 186: TO 1-1-700 b. Use e-inch rivnuts of
Page 187 and 188: TO 1-1-700 10.17.3 If the plating s
Page 189: TO 1-1-700 Figure 10-16. Dissipatio
Page 192 and 193: TO 1-1-700 (2) If allowable damage
Page 194 and 195: TO 1-1-700 Table 11-1. Recommended
Page 196 and 197: TO 1-1-700 11.6 3M CO. SCOTCH-BRITE
Page 198 and 199: TO 1-1-700 11.11.2 Control of Mecha
Page 200 and 201: TO 1-1-700 11.12.2 Mechanical Damag
Page 202 and 203: TO 1-1-700 MIL-DTL-81706 (ALODINE),
Page 204 and 205: TO 1-1-700 11.13.2.3 Application of
Page 206 and 207: 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 MIL-PRF-81733, SEALING A
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TO 1-1-700 MIL-PRF-81733, SEALING A
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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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