TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-401-34&P 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Adjust pressure regulator (1) by rotating handle (4) until pressure gage (5) indicates 5 psi (34.47 kPa). Close nitrogen tank valve (2). Install preformed packing on bottom of cover as- sembly (6). Secure cover assembly (6) to fabricated leak test adapter (7) with four machine screws (8) and four wing nuts (9). Connect hose assembly (10) to inlet port(11) on fabricated leak test adapter (7). Adjust handle (4) counterclockwise until 1 psig (6.89 kPa) is registered on the low pressure gage (5). Maintain a 1 psig (6.89-kPa) pressure for 10 sec- onds, then turn handle (4) clockwise to the closed position. Disconnect hose assembly (10) from the inlet port (11) and lay hose assembly (10) aside. Completely immerse cover assembly (6) and fabri- cated leak test adapter (7) in a container of clear water. While cover assembly (6) is immersed, inspect the area around the lamp shell (12) for air bubbles that indicate a pressure leak. Remove cover assembly (6) and fabricated leak test adapter (7) from the container of clear water. Release pressure from fabricated leak test adapter (7) at inlet port (11). Remove four wing nuts (9), four machine screws (8), and cover assembly (6) from fabricated leak test adapter (7). If air bubbles were detected, repair cover assembly (ref. para 3-17) and repeat the cover assembly leakage test. If air bubbles were not detected, use a clean, dry wiping rag to dry cover assembly. 3-55/(3-56 blank)