28-21-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
LANYARD (PREFERREDINSTALLATION)
PRESSURE REFUEL STATION
SEE A
PRESSURE
REFUEL REFUEL
STATION REFUEL RECEPTACLE
RECEPTACLE ADAPTER
SEE A ADAPTER
SEE B
SEE B
PRESSURE REFUEL STATION
REFUEL RECEPTACLE
A
CENTER PIN (MUST COME OUT WHEN IN SLOT)
FLANGE
THICKNESS OF LUG WIDTH OF LUG
(0.224 INCH MAX) (0.425 INCH MAX)
LUG (3 LOCATIONS) WEAR GAUGE
SEE D
C
SLOT (3 LOCATIONS)
0.224 INCH SEE E MINIMUM THICKNESS
REFUEL RECEPTACLE ADAPTER
0.250 INCH
(EXAMPLE) 0.305 INCH THICKNESS
MAXIMUM WIDTH B
0.425 INCH
SLOT
MINIMUM WIDTH LUG (3 LOCATIONS)
(3 LOCATIONS)
E D
Refuel Receptacle Adapter Figure 601
C18746
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747-400
MAINTENANCE MANUAL
(c) The three slots of the flange must not be worn such that a pin, oblong with full circular ends of 0.305 inch width and 0.250 inch thickness, can be put into the slots a depth of 0.120 inch (View E).
S 966-005
(4) If the flange of the adapter is not in the correct limits, replace the refuel receptacle adapter (AMM 28-21-14/401).
NOTE: Make sure a new flange is installed.
____
E. Put the Airplane Back to the Usual Condition
S 866-006
CAUTION: MAKE SURE THE DEFUEL LEVER IS CORRECTLY POSITIONED IN THE
_______ RECESS ON REFUEL RECEPTACLE ADAPTER. IF THE DEFUEL LEVER IS NOT IN THE CORRECT POSITION, IT IS POSSIBLE TO DAMAGE THE REFUEL RECEPTACLE ASSEMBLY. IF THE REFUEL RECEPTACLE ASSEMBLY IS DAMAGED, A FUEL LEAK CAN OCCUR.
(1)
Make sure the defuel lever is correctly positioned in the recess for refuel receptacle adapter.
S 416-008
(2)
Install the refuel receptacle caps.
S 416-007
(3)
Close the applicable pressure refuel station access door, 521BB or 621BB.
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747-400 MAINTENANCE MANUAL
REFUEL RECEPTACLE - REMOVAL/INSTALLATION
_________________________________________
1. General_______
A. This procedure gives instructions to remove and install the refuel receptacles.
B. The refuel receptacles are installed on the forward side of the front spar in each of the wings.
C. You can get to the refuel receptacles through the doors on the pressure refuel station.
D. When you extend the leading edge flaps, install the safety locks.
TASK 28-21-01-004-001
2. Refuel Receptacle Removal (Fig. 401)_________________________
A. Equipment
(1)
Dust cap - for spar opening
B.
References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 27-81-00/201, Leading Edge Flap System
(3)
AIPC 28-21-05 Fig. 1
C.
Access
(1)
Location Zones
521 Leading Edge to Front Spar, Left
621 Leading Edge to Front Spar, Right
(2)
Access Panels
521BB Fueling Station Access Door
621BB Fueling Station Access Door
D.
Procedure
S 494-022
(1) Do this task: Extension of the Leading Edge Flaps
(AMM 27-81-00/201).
S 494-002
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT INSTALL THE SAFETY LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
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