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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 862-068
 WARNING: MAKE SURE THAT THE ELECTRICAL SYSTEM IS CLEAR OF OTHER PERSONS
_______ BEFORE YOU SUPPLY POWER TO THE AIRPLANE. HIGH VOLTAGES CAN CAUSE INJURIES.
 WARNING: 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.
 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.

 S 862-070

 (2)  
Start the APU and let it operate for 90 seconds (AMM 49-11-00/201).

 S 212-071

 (3)  
Make sure that the AVAIL lights on the APU GEN 1 and 2 switches are 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 862-141
 CAUTION: DO NOT OPERATE THE APU FOR MORE THAN 10 MINUTES, IF THE AC
_______ BUSSES ARE NOT ON. THE ELECTRICAL NEEDS OF THE APU CAN DISCHARGE THE APU BATTERY. THE APU WILL NOT START IF THE APU BATTERY IS DISCHARGED.
 (4)  
Push the GROUND SERVICE switch on the flight attendants panel (door 2-left).

 (5)  
Make sure that the ON light on the GROUND SERVICE switch is on.

 S 212-073
 TASK 24-22-00-862-128
 10. Remove APU Generator Power from the AC Buses (Fig. 201)
____________________________________________
 A. References
 (1)  49-11-00/201, Auxiliary Power Unit
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 24-22-00
 ALL  ú ú 06 Page 218 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 B. Access
 (1)  
Location Zone
 221 Control Cabin, LH

 C.
Procedure

 S 862-076
 (1)  Push the APU GEN 1 and APU GEN 2 switches on the P5 overhead panel.
 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 862-077
 (2)  
Make sure that the AVAIL lights on APU GEN 1 and APU GEN 2 switches are on.

 S 862-078

 (3)  
Stop the APU (AMM 49-11-00/201).

 S 862-079

 (4)  
Set the STANDBY POWER switch to OFF.

 S 862-112
 CAUTION: THE BATTERY SWITCH MUST BE OFF WHEN ELECTRICAL POWER IS REMOVED
_______ FROM THE AIRPLANE. 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.
 (5)  Set the BATTERY switch to OFF.
 TASK 24-22-00-862-081
 11. Remove APU Generator Power from the Ground Handling/Ground Service Buses
________________________________________________________________________ (Fig. 201)
 A. References
 (1)  
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

 S 862-082
 (1)  Make sure that the ON light on the GROUND SERVICE switch on the flight attendants panel (left door 2) is on.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 24-22-00
 ALL  ú ú 06 Page 219 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 862-083
 (2)  
Push the GROUND SERVICE switch on the flight attendants panel (door 2-left).
　
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