28-41-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 FUEL QUANTITY COMPENSATOR - REMOVAL/INSTALLATION
________________________________________________
 1.  General
_______
 A.  This procedure contains instructions to remove and install the fuel quantity compensator. The procedure is the same for all installations, only the location is different.
 B.  One compensator is found in each fuel tank, installed on a bracket at the low point of the fuel tank.
 C.  Access to the compensator is through the applicable fuel tank access door and spanwise beam access doors (center wing tank only).
 TASK 28-41-02-004-001
 2.  Fuel Quantity Compensator Removal (Fig. 401)
_________________________________
 A.  References
 (1)
AMM 28-11-00/201, Fuel Tanks

 (2)
AMM 28-11-09/401, Spanwise Beam Access Door

 (3)
AMM 28-26-00/201, Defueling

 (4)
AIPC 28-41-02 Fig. 1

 (5)
SSM 28-41-03, 28-41-04, 28-41-05

 (6)
WDM 28-41-21, 28-41-22, 28-41-23, 28-41-24

 B.  
Access

 (1)  
Location Zones 132 Center Section Wing Box, Right 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 546 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 553 Reserve Tank, Front Spar to Rear Spar, Left 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 646 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

 C.  
Procedure

 (1)
Defuel the applicable fuel tank (AMM 28-26-00/201).

 S 654-002
 S 864-020
 CAUTION: 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 go into the fuel tanks (AMM 28-11-00/201).
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 28-41-02
 ALL  ú ú 05 Page 401 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 014-004
 (3)  
For the compensator in the center wing tank, remove the spanwise beam access doors, 131AZ and 131BZ (AMM 28-11-09/401).

 S 034-005

 (4)  
Remove the nuts (8, 9, and 10) that attach the terminals of the FQIS wire bundle (11) to the terminal block on the compensator (4).

 S 034-006

 (5)  
Remove the nut (7) and washer (6) that attach the clamp (5) to the terminal block on the compensator (4).

 S 034-021

 (6)  
Remove the clamp (5) and the terminals of the FQIS wire bundle (11) from the compensator (4).

 S 034-007

 (7)  
Remove the screws (3), washers (2), and nuts (1) (four locations) that attach the compensator (4) to the mounting bracket.

 S 024-008

 (8)  
Remove the compensator (4) from the fuel tank.

 TASK 28-41-02-404-009
 3.  Fuel Quantity Compensator Installation (Fig. 401)______________________________________
 A. General
 (1)  
After you replace a compensator you can use the EICAS maintenance pages to display the compensator capacitance value. (Reference the Dry Tank Capacitance Test) (AMM 28-41-00/501). Although the capacitance check can provide system information, it is not necessary to do this test. The only test that is necessary is the CMCS ground test, <FUEL QUANTITY IND. If the ground test shows a "PASS" indication the fuel quantity indication system is operational. (Reference the Fuel Quantity Indication System Ground Test) (AMM 28-41-00/501).

 B.
Parts

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