GENERAL SUPPORT MAINTENANCE INSTRUCTIONS
Section I REPAIR PARTS, SPECIAL TOOLS, TMDE, AND SUPPORT EQUIPMENT
Repair parts are listed and illustrated in TM 5-4120-359-24P. No special tools are required for general support
maintenance of the air conditioner. Test, maintenance, and diagnostic equipment (TMDE), and support equipment,
includes standard electrical test equipment and standard pressure and vacuum gages, vacuum pumps, and servicing
manifolds found in any general support maintenance refrigeration facility.
Section II AUTHORIZED GENERAL SUPPORT MAINTENANCE ACTIONS
The only items restricted to general support maintenance level by the Maintenance Allocation Chart (MAC are the repair
or replacement of insulation or lifting fittings on the evaporator and condenser housings. However, general support
maintenance may be called upon, at times, to perform any or all of the MAC items listed for organizational and direct
support maintenance for rehabilitation or overhaul of an air conditioner.
(1) Repairs are limited to rework of broken or cracked welds, straightening of bent or dented sheet metal,
replacement of lifting fittings, gaskets, insulation and plate nuts, and some small sheet metal parts by drilling out rivets
and installation of replacement parts.
(2) Disassemble unit as necessary and make repair as indicated.
(3) Insulation replacement
(a) Use only insulation identified in TM 5-4120-359-24P.
(b) Remove as much old insulation material as possible by pulling or scraping it away from the metal surface.
Acetone and methyl-ethyl ketone (MEK) are flammable, and their vapors can be
explosive. Repeated or prolonged skin contact or inhalation of vapors can be
toxic. Use a well-ventilated area, wear gloves, and keep away from sparks or
(c) Soften and remove old adhesive and insulation residue, using acetone or methyl-ethyl ketone (MEK) and a
(d) Coat the mating surfaces of the metal and insulation with adhesive, item 12, Appendix E. Let both surfaces
air dry until the adhesive is tacky but will not stick to fingers.
(e) Starting with an end, carefully attach the insulation to the metal. Press into firm contact all over.
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