(8)
Close the external power access door 118A.
TASK 24-22-00-862-057
8. Apply APU Generator Power to the AC Buses (Fig. 201)
_________________________________________
A. References
(1)
AMM 49-11-00/201, Auxiliary Power Unit
B.
Access
(1)
Location Zone
221 Control Cabin, LH
C.
Procedure
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A
747-400 MAINTENANCE MANUAL
S 862-058
WARNING: MAKE SURE THAT THE ELECTRICAL SYSTEM IS CLEAR OF OTHER PERSONS
_______ BEFORE YOU SUPPLY POWER TO THE AIRPLANE. HIGH VOLTAGES CAN CAUSE INJURIES.
MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE FLAPS BEFORE YOU TURN THE POWER ON. THE FLAPS CAN AUTOMATICALLY MOVE WHEN YOU SUPPLY ELECTRICAL POWER.
WARNING: MAKE SURE ALL AIRPLANE SYSTEMS THAT USE ELECTRICAL POWER ARE IN
_______ A SAFE CONDITION. AIRPLANE SYSTEMS CAN OPERATE AND CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
CAUTION: THE BATTERY SWITCH MUST BE OFF WHEN ELECTRICAL POWER IS TURNED
_______ OFF. IF THE BATTERY SWITCH IS ON WITH NO AC POWER ON THE AIRPLANE, THE BATTERIES CAN BECOME DISCHARGED. THE APU WILL NOT START IF THE APU BATTERY IS DISCHARGED.
(1) Set the BATTERY switch, on the P5 panel, to ON.
NOTE: Most of the switches and lights you must use are on the
____ P5 overhead panel. Other panels you must use will be identified in the procedure.
S 862-059
(2)
Set the STANDBY POWER switch to AUTO.
S 862-123
(3)
Set the BUS TIE 1, 2, 3, and 4 switches to AUTO.
S 862-152
(4)
Make sure that the FIELD OFF lights for the APU generators 1 and 2, on the P461 maintenance panel, are off.
NOTE: If a FIELD OFF light is on, push and release the APU 1 or
____
2 field switch to turn the light off.
S 862-060
(5)
Start the APU and and let it operate for 90 seconds (AMM 49-11-00/201).
S 212-062
(6)
Make sure that the AVAIL lights on the APU GEN 1 and 2 switches are on.
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747-400 MAINTENANCE MANUAL
S 862-168
CAUTION: AFTER PUSHING ONE APU GENERATOR SWITCH, WAIT A MINIMUM OF 6
_______ SECONDS BEFORE PUSHING THE SECOND APU GENERATOR SWITCH. PUSHING THE SECOND APU GENERATOR SWITCH SOONER MAY OVERSTRESS THE APU GEARBOX AND CAUSE DAMAGE.
(7)
Push the APU GEN 1 and APU GEN 2 switches.
S 212-064
(8)
Make sure that the ON lights on the APU GEN 1 and 2 switches are on.
S 212-065
(9)
Make sure that the ISLN lights on the BUS TIE 1, 2, 3, and 4 switches are off.
S 212-115
(10)
Set the L and R UTILITY switches to ON.
S 212-116
(11)
Make sure that the OFF lights on the L and R UTILITY switches are off.
TASK 24-22-00-862-067
9. Apply APU Generator Power to the Ground Handling/Ground Service Buses_____________________________________________________________________ (Fig. 201)
A. References
(1)
AMM 49-11-00/201, Auxiliary Power Unit
B.
Access
(1)
Location Zone 118 Electrical and Electronics Compartment, RH 221 Control Cabin, LH 231 Passenger Cabin First to Second Door, LH
C.
Procedure
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