TRANSMISSION OIL PRESSURE INDICATING AND WARNING SYSTEM OPERATIONAL CHECK (Continued)

TRANSMISSION OIL PRESSURE INDICATING AND WARNING SYSTEM OPERATIONAL CHECK (Continued) - TM-55-1520-240-T-2_254

TRANSMISSION OIL PRESSURE INDICATING AND WARNING SYSTEM OPERATIONAL CHECK (Continued) - TM-55-1520-240-T-2_256

TM-55-1520-240-T-2 CH-47D Heilcopter Manual
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TM 55-1520-240-T 8-9.3 TRANSMISSION OIL PRESSURE INDICATING AND WARNING SYSTEM OPERATIONAL CHECK (Continued) 8-9.3 TASK RESULT CHECK TRANSMISSION OIL PRESSURE INDICATING SYSTEM 36. Close left and right forward work platforms. 37. Close pylon lower fairing and hinted fairing. 38. Close aft transmission baffles. 39. Check that XMSN OIL PRESS circuit If circuit breaker (1) is open, close it. If it opens breaker (13) is closed. again, go to task 8-9.16. 40. Check that XMSN OIL PRESS switch (14) If switch (14) is not at SCAN, then set it to SCAN. is set to SCAN. 41. Have pilot start engines and stabilize rpm at 100 Indicator (15) should indicate in normal pressure percent Check XMSN OIL PRESS range, 20 to 90 psi. If it does not, turn knob MSN indicator (15). Record Indication. OIL PRESS switch (14). To FWD, AFT, MIX, LEFT then RT positions. Note indications, and go to task 8-9.17. 42. Set and hold knob on XMSN OIL PRESS Pointer on indicator(15) shall move to 0. Switch (14) switch (14) to TEST. TEST position shall light. If pointer does not move to 0 or TEST position does not Light, replace switch (14). 43. Release knob on XMSN OIL PRESS Knob on switch (14) shall return to SCAN position. switch (14). SCAN position shall light. Pointer on indicator (15) shall move to operating pressure indication. If knob does not return to SCAN or SCAN position does not light, replace switch. 44. Turn knob on XMSN OIL PRESS Each position on switch (14) shall Light when switch (14) to FWD, AFT, MIX, LEFT, selected. Each indicator (15) switch position then RT positron. Record indication on indication shall be in normal pressure range, XMSN OIL PRESS indicator (15) for each 20 to 90 psi. If any switch position does not switch position. light, replace switch. If any indicator indica- tion is not in normal range, go to task 8-9.18. 45. Compare indications recorded in step 41 and If Lowest indication recorded in step 44 is not within step 44. 3 percent of step 41 indication replace switch (14). 46. Turn knob on XMSN OIL PRESS Switch position of Lowest indication recorded in switch (14) to SCAN. step 44 shall Light. If it does not, replace switch (14). TASK RESULT FOLLOW-ON MAINTENANCE: Have pilot shutdown engines. TM 55-1520-240-23 Electrical Power Off Battery Disconnected Hydraulic Power Off GO TO NEXT PAGE- 8-162

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