SECTION III: PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
a. Check for loose or missing access covers.
b. Replace defective door seals.
c. Replace defective straps and retaining damps.
a. Rotate cupola to ensure that ring does not bind.
b. Operate cupola door latches and locks in open and
Will not lock
closed positions to assure ease of operation.
c. Check seals and crash pads for tears and deterioration.
d. Check that vision blocks are free of fungus growth,
chips, fractures, and separation that would interfere
a. With machine gun installed, elevate and depress mount
to full range (93° elevation and 21° depression).
b. Check for weak or faulty equilibrator action.