TM 9-4120-407-14
CHAPTER 5
GENERAL SUPPORT MAINTENANCE INSTRUCTIONS
SECTION I GENERAL SUPPORT TROUBLESHOOTING
5-1. GENERAL. Repair parts are listed and illustrated in TM 9-4120-407-24P. No special tools are
required for general support maintenance of the air conditioner. Test, maintenance, and diagnostic equipment
(TMDE), and support equipment, include standard electrical test equipment, and standard pressure and
vacuum gages, vacuum pumps and servicing manifolds found in any general support maintenance refrigeration
shop.
SECTION II GENERAL SUPPORT MAINTENANCE PROCEDURES
5-2. GENERAL. The only items restricted to general support maintenance level by the Maintenance
Allocation Chart (MAC) are the repair of replacement 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.
5-3. BOTTOM PANEL INSPECTION AND REPAIR.
d. Installation
c. Removal
a. Inspection b. Repair
This task covers:
Equipment Conditions:
Tools
Panels and components removed per appropriate
Service Refrigeration Unit Tool Kit
procedures to access bottom panel.
Materials/Parts
a . Inspection. Check nut plates and blind rivet nuts for visible signs of damage such as stripped threads
or loose rivets. Replace if threads are damaged and repair nut plates if rivets are loose.
b. Repair.
(1) Drill through rivet using drill bit slightly smaller than rivet diameter.
(2) Remove any remaining rivet material.
(3) Install new rivet(s).
5-1