(2)
28-11-09/401, Spanwise Beam Access Door
(3)
28-26-00/201, Defueling
(4)
AIPC 28-13-01 Fig. 1
(5)
AIPC 28-13-02 Fig. 2
B.
Access
(1)
Location Zones 131 Center Section Wing Box, Left 132 Center Section Wing Box, Right 542 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 552 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 553 Reserve Tank, Front Spar to Rear Spar, Left 642 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 652 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right 653 Reserve Tank, Front Spar to Rear Spar, Right
(2)
Access Panels
131AZ Spanwise Beam Access Door
131BZ Spanwise Beam Access Door
131CZ Spanwise Beam Access Door
131DZ Spanwise Beam Access Door
132AZ Spanwise Beam Access Door
132BZ Spanwise Beam Access Door
552AB Fuel Tank Access Door
552FB Fuel Tank Access Door
652AB Fuel Tank Access Door
652FB Fuel Tank Access Door
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28-13-02
ALL ú ú 04 Page 401 ú Oct 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
C. Procedure
S 654-002
(1) Defuel the applicable fuel tank (Ref 28-26-00/201).
S 864-033
WARNING: CAREFULLY DO ALL THE SAFETY PROCEDURES TO DEFUEL AND GO INTO
_______ THE FUEL TANKS. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT OBEY THE SAFETY PROCEDURES.
(2)
Purge and prepare to go into the fuel tank (Ref 28-11-00/201).
S 014-004
(3)
Remove more tank access doors, if it is necessary, to get access to the float valve that is to be disassembled (Ref 28-11-02/401).
NOTE: Refer to this table for access door locations.
____
~................................................................. | FLOAT VALVES ACCESS | ................................................................... | TANK | VALVE | WING STATION | ACCESS DOOR | ................................................................... | RESERVE | OUTBOARD | W.S. 1481 | 553KB | 653KB | | NO. 2 NO. 3 | | | | | ................................................................... | MAIN | OUTBOARD | W.S. 1162 | 552GB | 652GB | | OUTBOARD | ..................................... | NO. 1 NO. 4 | | W.S. 1136 | 552EB | 652EB | | .................................................... | | MIDDLE | W.S. 944.4 | 552AB | 652AB | | | | ..................... | | | | 552AZ | 652AZ | ................................................................... | MAIN | OUTBOARD | W.S. 733 | 545BB | 645BB | | INBOARD | ..................................... | NO. 2 NO. 3 | | W.S. 680 | 545BB | 645BB | ........................................................….......... | CENTER | LEFT | | 131EZ 131AZ | | | | | 131BZ 131CZ | ................................................................... | | RIGHT | | 131EZ 132AZ | | | | | 131AZ 132BZ | | | | | 131BZ | 2..............…..............…...............…...................1
S 864-005
(4) Go into the fuel tank (Ref 28-11-00/201).
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28-13-02
ALL ú ú 05 Page 402 ú Jun 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 014-006
(5)
If you remove the float assembly from the float valve in the center wing tank, remove the spanwise beam access doors (Ref 28-11-09/401).
(a)
For the float valve on left side of the tank, remove the access doors 131AZ, 131BZ, and 131CZ.
(b)
For the float valve on the right side of the tank, remove the access doors 131AZ, 131BZ, 132AZ, and 132BZ.
S 034-007
(6)
Remove the screws, washers, and nuts (4 locations) that attach the valve to the mounting flange.
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