GENERAL SUPPORT MAINTENANCE INSTRUCTIONS
Section I. REPAIR PARTS, SPECIAL TOOLS, TMDE, AND SUPPORT EQUIPMENT
Repair parts are listed and illustrated in TM 5-4120-398-24P. No special tools are required for
general support maintenance of the air conditioner. Test, Measurement, and Diagnostic Equipment (TMDE), and support
equipment, include standard electrical test equipment, and standard pressure and vacuum gages, vacuum servicing manifolds
found in any general support maintenance and 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 of cracked or broken welds, repair or replacement of blind nuts, nut plates, and lifting handles in
casing, and blind nuts and nut plates in base. However, general support maintenance maybe 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.
a. Blind nuts and nut plates.
(1) To replace blind nuts (rivnuts) use a drill slightly smaller than the body of the blind nut.
(a) Carefully drill the old blind nut out.
(b) Install replacement part.
(2) To replace nut plates, use a drill slightly smaller than the body of the rivets securing the nut plate.
(a) Carefully drill the rivets loose.
(b) Remove the old nut plate.
(c) Install new nut plate with properly sized rivets.
b. Insulation Casing.
(a) Check for broken welds, badly bent or dented parts, and cracked or broken parts.
(b) Check that plate nuts and blind nuts are in place and secure.