S 863-042

 (6)
Make sure these components are in the closed position (Fig. 303):

 (a)  
Wing pressure relief valves (4 locations)

 (b)  
Landing gear doors

 S 483-043
 WARNING:_______INSTALL THE LOCKS ON ALL EXTENDED LEADING EDGE FLAPS. THIS WILL PREVENT INJURY FROM AN ACCIDENTAL OPERATION OF THE FLAPS.
 (7)  
Do this task for extended leading edge flaps: Extended Leading Edge Flaps Deactivation and Safety Locks Installation (AMM 27-81-00/201).

 S 483-044

 (8)  
Install the Cargo and Fuel Loading Support if the center of gravity will be out of limits (AMM 07-11-08/201).

 S 863-045

 (9)  
Make sure the onboard fuel load is in a valid fuel distribution configuration (equivalent to after a flight operation).

 (a) Transfer fuel if it is necessary (AMM 28-26-00/201).
 E. Pressure Refuel Operation Procedures
 S 653-047
 (1)  Do one of these pressure refuel operations:
 (a)  
Automatic Pressure Refueling (AMM 12-11-02/301)

 (b)  
Manual Pressure Refueling (AMM 12-11-03/301)

 (c)  
Center Wing Tank Refuel (AMM 12-11-05/301)

 (d)  
Alternate Refueling Procedures (AMM 12-11-06/301).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 TASK 12-11-01-603-068
 4.  Fuel Supply for APU Operation_____________________________
 A. General
 (1)  Do this task if the APU will supply power during the refuel operation.
 B. Reference
 (1)  AMM 49-11-00/201, Auxiliary Power Unit
 C. Access
 (1)  Location Zones
 223 Control Cabin, Left
 224 Control Cabin, Right

 D. APU Operation
 S 863-058
 (1)  
Make sure the No. 2 and 3 main tanks each contain a minimum of 2800 lbs (1300 kgs) of fuel.

 S 913-059

 (2)  
Operate the APU (AMM 49-11-00/201).

 S 863-060

 (3)  
Make sure the APU is started and running before you begin the refuel operation.

 S 863-062

 (4)  
Make sure the refuel operation is complete before you shutdown the APU.

 TASK 12-11-01-603-064
 5.  Alternate Fuel Supply for APU Operation_______________________________________
 A. General
 (1)  
Do this task to use a different (alternate) fuel tank to supply fuel to the APU.

 (2)  
AIRPLANES WITH A HYDROMECHANICAL SCAVENGE PUMP SYSTEM; If the inboard main tanks (MAIN 2 and 3) do not contain sufficient fuel, the outboard main tanks (MAIN 1 or 4) or the CWT can supply the APU with fuel.

 B. Reference
 (1)  
AMM 49-11-00/201, Auxiliary Power Unit

 (2)  
Location Zones
 225 Control Cabin, Left
 226 Control Cabin, Right

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A
747-400 MAINTENANCE MANUAL
 C. Alternate Fuel Supply For APU Operation
 S 863-069
 (1)  
Make a decision about which fuel tank will supply the APU with fuel.

 S 863-070

 (2)
If the No. 1, 3 or 4 main tank will supply fuel, do these steps:

 (a)  
Make sure the fuel supply tank contains a minimum of 2800 lbs (1300 kgs) of fuel.

 (b)  
Open the No. 2 crossfeed valve.

 (c)  
Open the crossfeed valve for the fuel supply tank.

 (d)  
Operate a boost pump for the fuel supply tank.

 (e)  
Operate the APU (AMM 49-11-00/201).

 (f)  
Make sure the APU is started and running before you begin the refuel operation.

 (g)  
Make sure the refuel operation is complete before you shutdown the APU.
　
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