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A
747-400
MAINTENANCE MANUAL

CENTER
NO. 2 WING TANK
MAIN TANK
NO. 1 MAIN TANK
NO. 2 FUEL QUANTITY
RESERVE COMPENSATOR
TANK SEE A
NOTE: LEFT WING SHOWN; RIGHT WING OPPOSITE.
1. NUT
FUEL QUANTITY  2. WASHER 
COMPENSATOR  BLOCK TERMINAL  3. SCREW 
SEE  A 

11. TERMINAL OF THE FQIS WIRE BUNDLE (3 LOCATIONS)
10. NUT
9. NUT
8. NUT
7. NUT MOUNTING BRACKET6. WASHER
5. CLAMP
4. COMPENSATOR
FUEL QUANTITY COMPENSATOR (EXAMPLE)
A
Fuel Quantity Compensator Installation Figure 401
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747-400
MAINTENANCE MANUAL

 ~.............................................................................. | MM | | IPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 1 | Nut | 28-41-02 | 01 | 60 | | | 2 | Washer | | | 55 | | | 3 | Screw | | | 50 | | | 4 | Compensator (Reserve Tank) | | | 40 | | | | Compensator (Inboard Main Tank) | | | 45 | | | 5 | Clamp | | | 10 | | | 6 | Washer | | | 15 | | | 7 | Nut | | | 20 | | | 8 | Nut | | | 35 | | | 9 | Nut | | | 25 | | | 10 | Nut | | | 30 | 2......…........…...................................…..........….....….........1
 C. References
 (1)
AMM 28-11-00/201, Fuel Tanks

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

 (3)
AMM 28-41-00/501, Fuel Quantity Indicating System

 (4)
SSM 28-41-03, 28-41-04, 28-41-05

 (5)
WDM 28-41-21, 28-41-22, 28-41-23, 28-41-24

 D.
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

 E.
Procedure

 (1)
Put the compensator (4) in its position on the mounting bracket.

 S 424-010
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747-400 MAINTENANCE MANUAL
 S 434-011
 (2)  Install the screws (3), washers (2), and nuts (1) (four locations) to attach the compensator (4) to the mounting bracket.
 NOTE: When you install the main tank compensators, make sure the
____ nozzle holes in the fuel mixing line below the compensator align with the middle two electrodes of the compensator. The nozzle holes must also be 1 inch or less from the compensator lower end. If the nozzle holes are not correctly aligned, the fuel mixing lines must be installed again.
 S 434-012
 (3)  Install the terminals of the FQIS wire bundle (11) on the terminal block of the compensator (4).
 NOTE: The terminal posts have different dimensions to prevent
____ errors in installation. Install each terminal (11) on the correct terminal post.
 S 434-022
 (4)  
Install the nuts (8, 9, and 10) on the terminal block of the compensator (4).

 S 434-019

 (5)  
Tighten the nuts (8, 9, and 10) to these torque limits:

 HI-Z 12-15 pound-inches
 LO-Z 25-35 pound-inches
 SHIELD 15-20 pound-inches

 S 434-013
 (6)  
Put the clamp (5) around the FQIS wire bundle.

 (7)  
Put the clamp in its position on the terminal block.
　
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