Operator's, organizational, direct support, and general support maintenance manual for power supply, hydraulic/electric, portable : (4933-933-4742) used with M5, M18(XM18), M18A1(XM18E1), M21, XM27E1, M28(XM28), M28A1(XM28E1), M35(XM35), and XM156 aircraft armament subsystems.

Includes index.

Operator and organizational maintenance manual : armament subsystem, helicopter, 7.62 millimeter machine gun-2.75 inch rocket launcher, M21 (1090-923-5971) (used on UH-1B and UH-1C helicopters).

Includes index.

Organizational maintenance repair parts and special tools list : armament subsystem, helicopter, 7.62 millimeter machine gun-2.75 inch rocket launcher, M21 (1090-923-5971) (used on UH-1B and UH-1C helicopters).

Includes index.

Direct support, general support, and depot maintenance repair parts and special tools list : armament subsystem, helicopter, 7.62 millimeter machine gun-2.75 inch rocket launcher, M21 (1090-923-5971) (used on UH-1B and UH-1C helicopters).

"October 1970."