420. ENG START CIRCUIT BREAKER DOES NOT STAY CLOSED (WITH ENG START NO 1 420 SWITCH IN START POSITION) (cont)

420. ENG START CIRCUIT BREAKER DOES NOT STAY CLOSED (WITH ENG START NO 1 420 SWITCH IN START POSITION) (cont) - TM-1-1520-238-T-4_185

TM-1-1520-238-T-4_187

TM-1-1520-238-T-4 Army Model AH-64 Helicopter (NSN
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TM 1-1520-238-T-4 4–101 4–20. ENG START CIRCUIT BREAKER – DOES NOT STAY CLOSED (WITH ENG START NO 1 4–20 SWITCH IN START POSITION) (cont) 19. Check for short between P439–A16 and ground. Does short exist? YES Go to step 20. NO Go to step 21. 20. Detach P977. Check for short between P439–A16 and ground. Does short exist? YES Repair shorted wire between P439–A16 and P977–A13. Go to paragraph 4–12. NO Replace start mode relay panel (TM 1-1520-238-23). 21. Identify and detach wires from (A402): TB2–8–A, TB2–8–B, TB2–8–E, TB2–8–F, TB2–8–J, and TB2–8–N. Check for short between (A402): J21–A2 and ground, J21–A11 and ground, J21–A14 and ground, J21–A15 and ground, J21–A16 and ground, J15–A2 and ground. Does short exist? YES Repair shorted wire between (A402): J21–A2 and TB2–8–N, J21–A11 and TB2–8–F, J21–A14 and TB2–8–A, J21–A15 and TB2–8–B, J21–A16 and TB2–8–E, J15–A2 and TB2–8–J. Go to paragraph 4–12. NO Refer to paragraph 6–12 to troubleshoot drive system. END OF TASK

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