...................................................................... | Main Tanks 3 and 4 | Airplane gross weight is less | | and Reserve Tank 3 | 750,000 pounds (340,909 | | | kilograms). | | | Reserve Tank 2 is empty. | | | Main Tank 1 contains less fuel | | | than the limit shown in Figure | | | 204 for the applicable airplane | | | gross weight. | | | Main Tank 2 can contain any | | | quantity of fuel. | 2.........................…..........................................1
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28-26-00
ALL ú ú 09 Page 238 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
MANUAL DEFUELING VALVE - REMOVAL/INSTALLATION
_____________________________________________
1. General_______
A. This procedure contains instructions to remove and install the manual defueling valve.
B. Two manual defueling valves, one at each fueling station, connect the fuel-feed manifold with the outboard pressure fueling receptacle. The removal and installation procedures for the two manual defueling valves is the same only the location is different.
C. Access to the manual defueling valve is through the fueling station door.
D. When persons are in the area of the wing leading edge, safety locks must be installed on all extended leading edge flaps.
E. Make sure that electrical power is removed from the airplane before the manual defueling valve is removed and that power is not put back until the manual defueling valve is installed.
TASK 28-26-01-004-001
2. Manual Defueling Valve Removal (Fig. 401)______________________________
A. Equipment
(1)
Container - 5-gallon capacity, suitable for collecting fuel
B.
References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 27-81-00/201, Leading Edge Flap System
(3)
AIPC 28-26-01 Fig. 2
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 Fueling Receptacle Access Door
D.
Procedure
S 494-022
WARNING:_______DO THE PROCEDURE IN AMM 27-81-00/201 TO INSTALL THE LOCKS. THE FLAPS MOVE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1)
Install locks on all extended leading edge flaps (AMM 27-81-00/201).
(2)
Remove electrical power (AMM 24-22-00/201).
(3)
Open the fueling receptacle access door 521BB or 621BB.
S 864-002
S 014-003
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28-26-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 034-004
(4)
Disconnect the coupling (3) at the manual defueling valve (1).
S 034-024
(5)
Discard the packing (2).
S 944-005
(6)
Put the container below the manual defueling valve (1) to catch the fuel leakage.
S 034-029
(7)
Remove the bolts (4) and washers (5) (four locations) that attach the manual defueling valve (1) to the front spar.
S 024-025
(8)
Remove the manual defueling valve (1).
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