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TM 9-4120-389-14
SECTION II. AUTHORIZED GENERAL SUPPORT MAINTENANCE ACTIONS
6-2. GENERAL
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 may be called upon, at
times, to perform any or all of the MAC items listed for organization and direct support maintenance for
rehabilitation or overhaul of an air conditioner.
6-3. CASING, REPAIR
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
(1)
Inspection
(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.
(c)
Check that insulation is not loose, missing, burnt, or otherwise damaged. Replace if
missing or damaged. Reglue if loose.
6-2
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