TM 9--2350--292--20--1 0187 00--121 0187 00 PREVENTIVE MAINTENANCE CHECKS AND SERVICES INCLUDING LUBRICATION INSTRUCTIONS -- CONTINUED TABLE 3 PREVENTIVE MAINTENANCE CHECKS AND SERVICES INCLUDING LUBRICATION INSTRUCTIONS, SEMIANNUALLY -- CONTINUED ITEM NO. NOT FULLY MISSION CAPABLE IF: PROCEDURE LOCATION ITEM TO CHECK/ SERVICE INTERVAL SEMIANNUALLY EXTERIOR 35 Commander’s Cupola a. Rotate commander’s cupola (1) to ensure that ring does not bind. b. Operate cupola door latch (2) and lock (3) in open and closed positions to ensure ease of operation. c. Check seals (4) and crash pads (5) for tears and deterioration. d. Check that vision blocks (6) are free of fungus growth, chips, fractures and separation that would interfere with vision. Any missing, loose, damaged seals, crash pads or mounting hardware. Cupola does not rotate smoothly. LUBRICANTS/ COMPONENTS REFILL CAPACITY EXPECTED TEMPERATURE* +40°F to --10°F (+4°C to --23°C) Above +32°F (Above 0°C) 0°F to --65°F (--17°C to --54°C) GREASE: Automotive and Artillery Grease, (GAA), MIL--G--10924 As Required *For Arctic Operation, refer to FM 9--207 ALL TEMPERATURES e. Lubricate commander’s cupola hatch hold open latch (7) with GAA through fitting (8) until grease is visible. f.   Wipe excess grease with rag (item 7, WP 0716 00). Any clogged, missing or damaged grease fittings. 1 2 3 4 5 6 HIDDEN HIDDEN 7 8 1 6