(2)
Electrical power for the ac electric motor is supplied from the ac ground handling bus and the dc power bus. The APU can also supply power for the motor. The motor can only operate when the airplane is on the ground.
NOTE: 28 V dc power operates the switch which supplies 115 V ac
____
power to the AUX pump.
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A
747-400
MAINTENANCE MANUAL
ENGINE NACELLE STRUT
FWD
MODULE CASE DRAIN SEE A SEE B
AIR-DRIVEN PUMP (REF)
FILTER CASE DRAIN AC PUMP A FWD HOSE CASE DRAIN HYDRAULIC PUMP AUXILIARY
PRESSURE HOSE
SUPPLY HOSE
FWD B (RIGHT SIDE SHOWN)
Auxiliary AC Hydraulic System Components Figure 1
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747-400
MAINTENANCE MANUAL
HYDRAULIC CONTROL MODULE
Auxiliary Hydraulic Pump Control Switch
Figure 2
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MAINTENANCE MANUAL
(3) The auxiliary hydraulic pump will operate when:
-The airplane is on the ground, and
-Electrical power is supplied, and
-The control switch is in the AUX position, and
-System 1 or 4 EDP pressure is less than 1,400 psi.
(4) If the temperature of the auxiliary case drain fluid increases above 105° C, it will cause an advisory message. The advisory message HYD OVHT SYS (1 or 4) will be shown on the main EICAS screen. This message can also be an indication that the EDP or air-driven pump case drain temperatures are above 105° C.
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