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PERIODIC PREVENTIVE MAINTENANCE CHECKS AND SERVICES-continued
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TM-11-5820-670-12 Radio Set AN/ARC-131(NSN
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Section IV TROUBLESHOOTING


TM 11-5820-670-12
ORGANIZATIONAL PREVENTIVE MAINTENANCE CHECKS AND SERVICES. (CONT)
3-6.
PULLOUT INTERVAL
Radio Set AN/ARC-131 will be removed from aircraft every 300 flight-hours and checked by direct
support (aviation intermediate) maintenance personnel. Instructions for performing required checks
are identified as pullout checks in direct support (aviation intermediate) maintenance manuals.
3 - 7 . CLEANING AND TOUCHUP PAINTING.
This paragraph provides procedures for cleaning exterior surfaces of the radio set and instructions for
touchup, refinishing, or repainting as required.
CLEANING
WARNING
Fumes of TRICHLOROTRIFLUOROETHANE are poisonous. Provide adequate ventilation
whenever you use TRICHLOROTRIFLUOROETHANE. Do not use solvent near heat or open
flame. TRICHLOROTRIFLUOROETHANE will not burn, but heat exchanges the gas into
posionous, irritating fumes. DO NOT breathe the fumes or vapors. TRICHLOROTRl-
FLUOROETHANE dissolves natural skin oils. DO NOT get the solvent on your skin. Use
gloves, sleeves, and an apron which the solvent cannot penetrate. If the solvent is taken
internally, consult a physician immediately.
CAUTION
Use only clear water and a rag to clean plastic surfaces. Do not paint a plastic surface.
Damage to plastic will result if cleaned with solvents or painted. Do not press on meter
face when cleaning, meter face may become damaged.
Remove moisture and loose dirt with a clean, dry, soft cloth. If dirt is difficult to remove, dampen cloth
with water; if necessary, use mild soap. Oil and greases can be removed by damping cloth with clean-
ing solvent.
Excessively dirty intake and exhaust grills on the exterior of the receiver-transmitter can be cleaned by
brushing off loose dirt with a dry brush, or vacuuming if a vacuum cleaner is available.
TOUCHUP PAINTING
CAUTION
Do not paint plastic surfaces. If plastic is accidentally painted, do not try to remove paint
as damage to plastic will occur.
When the radio set requires repainting, refinishing, or touchup painting, use a lusterless aviation
black paint, color no. 37038 as listed in Federal Standard No. 595a, or equivalent. Refer to applica-
ble painting and refinishing instructions given in SB 11-573 and TB 43-0118.
Remove rust and corrosion from metal surfaces by lightly sanding with fine sandpaper. Brush two thin
coats of paint on bare metal to protect it from further corrosion.
A perfect match with exact shade of original paint may not be possible. The prevention of corrosion
and deterioration is the most important consideration. This, however, should not be taken to mean
appearance is not important. Touchup paint should be accomplished neatly and in a good workman-
ship-like manner.
3-15


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