S 862-413
 (4)  Remove the DO-NOT-OPERATE tags from the FUEL CONTROL switches on the control stand.
 S 862-397
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LEADING
_______ EDGE AND TRAILING EDGE FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
 (5)  Make sure the area around the LE and TE flaps are clear of persons and equipment.
 S 442-415
 WARNING: DO THE PROCEDURE IN AMM 27-81-00/201 TO REACTIVATE THE LE
_______ FLAPS. THE FLAPS MOVE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (6)  Reactivate the leading edge flaps (AMM 27-81-00/201).
 S 442-416
 WARNING:_______THE TE FLAPS CAN MOVE QUICKLY. FOLLOW THE (AMM 27-51-00/201) PROCEDURE WHEN YOU REACTIVATE THE TE FLAPS. TE FLAPS MOVEMENT CAN CAUSE DAMAGE TO EQUIPMENT AND INJURY TO PERSONNEL.
 (7)  
Reactivate the TE flaps (AMM 27-51-00/201).

 S 082-417

 (8)  
Remove the door locks for the wing and body gear if installed (AMM 32-00-30/201).

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747-400
MAINTENANCE MANUAL

 S 082-418
 (9)  
Remove the tail support equipment, if it is not necessary for subsequent tasks (AMM 07-11-08/201).

 S 862-419

 (10)
 Remove electrical power, if it is not necessary for other tasks (AMM 24-22-00/201).

 TASK 28-26-00-652-048
 4. Defueling With the External Power Control Unit
_______________________________________________
 A. General
 (1)  
Use this procedure when it is not possible to supply power to the boost pumps through the airplane electrical system.

 (2)  
Do not use this procedure to defuel the airplane with a damaged boost pump.

 B.
Special Tools and Equipment

 (1)  
F70316-1 - External Power Control Unit (PCU), for auxiliary defueling

 C.
References

 (1)  
AMM 07-11-01/201, Jacking Airplane

 (2)  
AMM 07-11-08/201, Cargo and Fuel Loading Support

 (3)  
AMM 20-41-01/201, Static Grounding

 D.
Access

 (1)  
Location Zones 521 Leading Edge, Front Spar to Rear Spar, Left 621 Leading Edge, Front Spar to Rear Spar, Right

 (2)  
Access Panels
 521BB Fueling Receptacle Access Panel
 521CB Fueling Control Panel Access Panel
 621BB Fueling Receptacle Access Panel

 E.
Prepare for Defueling

 S 652-218
 (1)  To make sure the fuel tanks are balanced, do this Task: Fuel Tank Imbalance.
 S 912-139
 WARNING: IF THE BOOST PUMP ASSEMBLY IS DAMAGED, DO NOT USE THE BOOST
_______ PUMP TO DEFUEL THE AIRPLANE. A FUEL LEAK CAN OCCUR WHICH CAN CAUSE A DANGEROUS CONDITION FOR EQUIPMENT AND PERSONS.
 (2)  Ground and bond the airplane and the fuel trucks (AMM 20-41-01/201).
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747-400 MAINTENANCE MANUAL
 (3)  S 862-050Make sure the fuel system circuit breakers on the P6, P12, P414, and P415 panels are open.
 (4)  S 862-051Make sure that the refuel valves are in the closed position.
 (5)  S 862-052Make sure that the fuel shutoff valves for the engine are in the closed position.
 (6)  S 862-053Make sure that the fuel jettison valves are in the closed position.
 (7)  S 012-054Open the access doors for the refuel station in each wing.
 (8)  S 012-055Open the access door for the control panel in the left wing.
 (9)  S 032-056Remove the fueling receptacle caps.
 S 862-057
　
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