2......…........…...................................…..........….....….........1
 *[1]TO BE FURNISHED
 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

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747-400
MAINTENANCE MANUAL

 D. Access
 (1)  
Location Zones 131 Center Section Wing Box, Left 132 Center Section Wing Box, Right 541 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 542 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 543 Outbd Main Tank (Part), Front Spar to Mid Spar, Left 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 545 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 546 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 551 Outbd Main Tank (Part), Front Spar to Mid Spar, Left 552 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 553 Reserve Tank, Front Spar to Rear Spar, Left 641 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 642 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 643 Outbd Main Tank (Part), Front Spar to Mid Spar, Right 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 645 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 646 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right 651 Outbd Main Tank (Part), Front Spar to Mid Spar, Right 652 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right 653 Reserve Tank, Front Spar to Rear Spar, Right

 E.
Procedure

 S 424-012
 (1)
Put the tank unit (4) in its position on the mounting bracket.

 S 434-013

 (2)  
Install the bolts (3), washers (2), and nuts (1) (if necessary) (four locations) to attach the tank unit (4) to the mounting bracket.

 NOTE: Attach the tank unit (4) to the top mounting bracket first.
____ Turn and move the bottom clamp on tank unit (4) to align with the bottom mounting bracket.
 S 434-014
 (3)  Install the terminals (11) on the terminal block of the tank unit (4).
 NOTE: The terminal posts have different dimensions to prevent
____ errors in installation. Install each terminal (11) on the correct terminal post.
 S 434-024
 (4)  Install the nuts (8,9, and 10) on the terminal block of the tank unit (4).
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747-400 MAINTENANCE MANUAL
 S 434-015
 (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 434-016
 (6)  
Put the clamp (5) around the FQIS wire bundle.

 S 434-025

 (7)  
Put the clamp (5) in its position on the terminal block of the tank unit (4).

 S 434-017

 (8)  
Install the washer (6) and nut (7) to attach the clamp (5) to the terminal block of the tank unit (4).

 S 224-018

 (9)  
Make sure there is a minimum clearance of 0.10 inch between the tank unit (4) and all tank structure.

 S 414-019

 (10)
 Install the spanwise beam access doors in the center wing tank, if removed (AMM 28-11-09/401).

 S 864-020

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

 S 744-021

 (12)
 Do the CMCS, <FUEL QUANTITY IND. ground test (AMM 28-41-00/501).

 NOTE: After you replace a tank unit you can use the EICAS
____ maintenance pages to display the capacitance value of the individual tank units. (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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