SECTION III: PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
TM 9-2350-256-20
Location
Item To
Not Fully
Item
Check/
Mission
No.
Interval
Service
Procedure
Capable If:
10
S
Access
a. Check for loose or missing access covers.
Covers,
S
Seals, Racks,
b. Replace defective door seals.
Straps, and
S
Clamps
c. Replace defective straps and retaining damps.
11
S
Comman-
a. Rotate cupola to ensure that ring does not bind.
der's Cupola
S
b. Operate cupola door latches and locks in open and
Will not lock
closed positions to assure ease of operation.
open or
closed
S
c. Check seals and crash pads for tears and deterioration.
S
d. Check that vision blocks are free of fungus growth,
chips, fractures, and separation that would interfere
with vision.
12
S
Machine
a. With machine gun installed, elevate and depress mount
Gun Mount
to full range (93° elevation and 21° depression).
.50-caliber
S
b. Check for weak or faulty equilibrator action.
2-15
