ITEM TO BE
a. Rotate cupola to ensure that ring does not bind.
b. Operate cupola door latches and locks in open and closed
Will not lock open or
positions to assure ease of operation.
d. Check that vision blocks are free of fungus growth, chips,
fractures, and separation that would interfere with vision.
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.
Solvents can burn easily, can give off harmful
vapors, and are harmful to skin and clothing. To
avoid injury or death, keep away from open flame
and use in a well-ventilated area. If solvent gets
on skin or clothing, wash immediately with soap
c. Clean mount with cleaning compound (item 9, WP 0489 00).
d. Lubricate all moving parts with lubricating oil (item 22, WP 0489