S 434-024

 (8)  
Install the washer (6) and nut (7) to attach the clamp (5) to the terminal block on the compensator (4).

 S 224-014

 (9)  
Make sure there is a minimum clearance of 0.25 inch between the compensator (4) and the fuel mixing tube (inboard main tanks).

 S 224-015

 (10)
 Make sure there is a minimum clearance of 0.10 inch between the compensator and all tank structure.

 S 434-023
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747-400 MAINTENANCE MANUAL
 S 414-016
 (11)
 For the compensator in the center wing tank, install the spanwise beam access doors, 131AZ and 131BZ (AMM 28-11-09/401).

 S 864-017

 (12)
 Go out of and close the fuel tank (AMM 28-11-00/201).

 S 744-025

 (13)
 Do the CMCS, <FUEL QUANTITY IND. ground test (AMM 28-41-00/501).

 NOTE: 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.
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747-400 MAINTENANCE MANUAL
 FUEL QUANTITY INDICATOR - REMOVAL/INSTALLATION
______________________________________________
 1.  General_______
 A.  This procedure contains instructions to remove and install the fuel quantity indicators on the P42 refuel control panel.
 TASK 28-41-04-004-001
 2.  Fuel Quantity Indicator Removal_______________________________
 A.  References
 (1)  
AIPC 28-41-04 Fig. 2

 (2)  
SSM 28-41-02

 (3)  
WDM 28-41-13

 B.  
Access

 (1)  
Location Zone
 521 Leading Edge of the Front Spar, Left

 (2)  
Access Panel
 521CB Refuel Control Panel

 C.  
Procedure

 S 864-010
 (1)
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
On the main power distribution panel, P6: 1) 6D5, FUEL QTY 1 2) 6D6, FUEL QTY 2

 (b)  
On the DC power distribution panel, P180: 1) 180M9, FUELING PWR - HOT BAT 2) 180C25, FUELING LTS PANEL 3) 180C26, FUELING LTS RECP

 (c)  
On the left power distribution center, P414: 1) 414F22, FUELING PWR

 S 014-009
 (2)  
Open the access door of the refuel control panel (521CB) until the door guide engages the detent.

 (3)  
Loosen the screw above the fuel quantity indicator.

 (4)  
Remove the fuel quantity indicator.

 S 034-004

 (5)  
Disconnect the electrical connector from the fuel quantity indicator.

 S 034-002
 S 024-003
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 TASK 28-41-04-404-005
 3.  Fuel Quantity Indicator Installation____________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AIPC 28-41-04 Fig. 2

 (3)  
　
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