GENERAL SUPPORT MAINTENANCE INSTRUCTIONS
Section I. GENERAL
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 housing, and replacement of the cabinet base. However, general
support maintenance may be called upon, at times, to perform any or all of the MAC items listed for unit and direct
support maintenance for rehabilitation or overhaul of an air conditioner.
Section II. CASING
Use disconnect switch (NOT POWER CABLE) to disconnect power to unit. Damage to cable
connector pins will result if cable is used.
a. Disconnect power at power source.
b. Check casing for visible signs of damage, cracks, broken welds, or punctures. Repair as indicated.
Repairs are limited to rework of broken or cracked welds, straightening of bent or dented sheet metal
and replacement of handles, gaskets, insulation, and rivnuts and some small sheet metal parts by
drilling out rivets and installation of replacement parts.
Minor dents and bent edges can be straightened using common sheet metal repair procedures.
Should touch up or refinishing be necessary, see TM 43-0139.
a. Disassemble unit as necessary and make repairs as indicated.
b. Gasket and insulation replacement.
Adhesive remover is flammable and the vapors can be explosive. Repeated or prolonged skin contact
or inhalation of vapors can be toxic. Use in a well ventilated area, wear gloves, and keep away from
sparks or flame.
Use only gaskets, insulation, or name plates identified in TM 9-4120-360-24P.
(1) Soften and remove old adhesive and gasket residue using adhesive remover and a stiff brush.
(2) Identify and fabricate gasket or insulation to be replaced.
(3) Coat the mating surfaces of the metal and new gasket material with adhesive. Let both surfaces air dry
until the adhesive is tacky but will not stick to fingers.