BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL

FUEL QUANTITY TANK UNIT
(EXAMPLE)

(EXAMPLE)
O
TANK COMPONENTS
Fuel Quantity Indicating System - Component Location
Figure 102 (Sheet 11)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 FUEL QUANTITY INDICATING SYSTEM - ADJUSTMENT/TEST
_________________________________________________
 1.  General_______
 A.  This procedure contains an operational test, a system test and a tank component test for the fuel quantity indicating system (FQIS).
 (1)  
The operational test contains these tests:

 (a)  
Fuel Quantity Indication System Ground Test (CMC)

 (b)  
Refuel Control Panel BITE.

 (2)  
The system test contains these tests:

 (a)  
Fuel Quantity Indication System Ground Test (CMC)

 (b)  
Wet Tank Capacitance Test

 (c)  
Dry Tank Capacitance Test

 (d)  
Indicated Fuel Quantity and Measured Fuel Quantity Comparison Test.

 (3)  
The tank component test for the fuel quantity indicating system contains these test:

 (a)  
Tank Unit and Compensator Test at the Fuel Tank Wall (spar connector)

 (b)  
Tank Unit and Compensator Test at the Fuel Quantity Processor Unit (FQPU)

 (c)  
Densitometer Fault Isolation Test at the Tank Wall (spar connector)

 (d)  
Densitometer Fault Isolation Test at the FQPU

 B.  
During maintenance in the area of the wing leading edge, install the safety locks on the leading edge flaps if they are extended.

 TASK 28-41-00-705-001
 2.  Fuel Quantity Indicating System Operational Test________________________________________________
 A.  General
 (1)  
The operational test for the fuel quantity indicating system (FQIS) does these tests:

 (a)  
The CMC ground test for the FQIS which includes a check of these LRUs: 1) Fuel quantity processor unit 2) Input/output cards 3) Individual fuel quantity channel cards (IFQC)

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 B.
C.
D.
E.
A
747-400 MAINTENANCE MANUAL
 4) Tank Units
 5) Compensators
 6) Densitometers.

 (b)  The refuel control panel BITE for the fueling quantity
 indicators on the P42 panel.References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 27-81-00/201, Leading Edge Flap System

 (3)  
AMM 28-22-16/401, Fuel System Card File

 (4)  
AMM 31-61-00/501, Integrated Display System (IDS)

 (5)  
AMM 32-09-02/201, Air/Ground Relays

 (6)  
AMM 34-61-02/401, Control Display Unit

 (7)
AMM 45-10-00/501, Central Maintenance Computer (CMC)Access

 (1)  
Location Zones 221 Control Cabin, Left 222 Control Cabin, Right 521 Leading Edge to Front Spar, Left

 (2)  
Access Panel 521CB Refuel Control Panel Access Door

Preconditions
 S 865-310
 (1)  
These conditions are necessary for this task:

 (a)  
Fuel Quantity Indication System (FQIS) serviceable.

 (b)  
The procedures in this task require different fuel quantity configurations. 1) The CMCS ground test, <FUEL QUANTITY IND, can be done with

 dry tanks or wet tanks, however, fuel is necessary to do a test of the densitometer and compensator density functions.
 2)  To do a complete ground test of the densitometers and compensators, make sure the densitometers/compensators are fully covered with fuel.
　
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