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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (3)  S 865-033Make sure the manual defueling valves are closed.
 (4)  S 655-034Disconnect the fueling nozzles from the fueling receptacles.
 (5)  S 435-083Install the receptacle caps.
 (6)  S 415-035Close the refuel station access doors, 521BB and 621BB.
 (7)  S 415-084Close the access door, 521CB, for the control panel.
 (8)  S 945-036Disconnect the bonding cable that you connected from the airplane to the fueling vehicle.
 (9)  S 095-180Disconnect the grounding cable for the fueling vehicle and other fuel equipment used for tank maintenance from the approved and identified static ground if no more maintenance is necessary.
 S 095-085

 (10) If you extended the leading edge flaps, do these safety procedures to retract them:
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO
_______ REMOVE THE LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT REMOVE THE SAFETY LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (a)  Remove the safety locks from the leading edge flaps (AMM 27-81-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

 WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE
 AND TE 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.  THIS CAN CAUSE INJURY TO

 PERSONS OR DAMAGE TO EQUIPMENT.
 (b)
Retract the leading edge flaps (AMM 27-81-00/201). S 865-038

 (11)
 Remove the electrical power, if it is not necessary for other tasks (AMM 24-22-00/201).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 PRESSURE FUELING SYSTEM - INSPECTION/CHECK
__________________________________________
 1.  General
_______
 A.  This procedure contains instructions to do a check of the refuel receptacle adapter.
 B.  If there is fuel leakage or damage at the refuel receptacle adapter, it must be replaced.
 TASK 28-21-00-756-001
 2.  Refuel Receptacle Adapter Check (Fig. 601)
_______________________________
 A.  Parts
 (1)  
Wear Gauge, part number 61657-7 (recommended), JC Carter Company, Inc., 671 W. 17th Street, Costa Mesa, California 92627

 B.  
References

 (1)  
AIPC 28-21-01, Fig. 50

 (2)  
AMM 28-21-14/401, Fueling Receptacle Adapter

 C.  
Access

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

 (2)  
Access Panels
 521BB Fueling Receptacle Access Door
 621BB Receptacle Access Door

 D.  
Procedure

 S 016-002
 (1)  
Open the applicable pressure refuel station access door, 521BB or 621BB.

 (2)  
Remove the refuel receptacle cap(s).

 (3)  
Make sure the flange of the adapter is in these limits:

 S 016-003
 S 756-004
 NOTE: Use of the wear gauge is recommended to measure these limits
____
 (View C).

 (a)  The thickness of the three lugs of the flange is more than
 0.224 inch (View D).
 (b)  The width of the three lugs of the flange is more than 0.425 inch (View D).
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