FUEL BOOST PUMP SYSTEM OPERATIONAL CHECK (Continued)

LH FUEL PUMPS MAIN FWD CIRCUIT BREAKER WILL NOT STAY CLOSED

TM-55-1520-240-T-3 CH-47D Heilcopter Manual
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TM 55-1520-240-T 10-2.3 FUEL BOOST PUMP SYSTEM OPERATIONAL CHECK (Continued) 10-2.3 TASK RESULT 33. 34. Set LEFT SIDE FWD AUX FUEL PUMP switch (26) to ON. Have helper standby left side fwd aux tank and listen for operation of boost pump. Set LEFT SIDE AFT AUX FUEL PUMP switch (25) to ON. Have helper standby left side aft aux tank and listen for operation of boost pump. AUX PRESS light (17) will go out. If not, go to task 10-2.27. Fuel will transfer from LEFT SIDE FWD AUX TANK to LEFT SIDE MAIN TANK. AUX PRESS light (17) will come on when LEFT SIDE FWD AUX tank is depleted. The fuel pump will shut off automatically. If fuel pump continues running after AUX PRESS light comes on and tank is empty, replace left side thermistor control box. Fuel will transfer from LEFT SIDE AFT AUX tank to LEFT SIDE MAIN tank. AUX PRESS light (17) will come on when LEFT SIDE AFT AUX tank is depleted. The fuel pump will shut off automatical- ly. If fuel pump continues running after AUX PRESS light comes on and tank is empty, replace left side thermistor control box. FOLLOW-ON MAINTENANCE: TM 55-1520-240-23: Battery Disconnected Electrical Power Off END OF TASK Change 3 10-45

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