28-21-32
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

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

 (4)  
AMM 28-41-00/501, Fuel Quantity Indication System

 (5)  
AMM 31-61-00/501, Intergrated Display System (IDS)

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

 (7)  
AMM 45-10-00/201, Central Maintenance Computer System

 (8)  
AMM 45-10-00/501, Central Maintenance Computer System

 C.
Access

 (1)  
Location Zones 125 Area Below Forward Cargo Container Compartment, Left 221 Control Cabin, Left 222 Control Cabin, Right

 (2)  
Access Panel
 125B Electronics Access Door

 D.
Preconditions

 S 865-031
 (1)  
These conditions are necessary for this task:

 (a)  
A specific fuel quantity is not necessary for this task.

 (b)  
Electrical Power On (AMM 24-22-00/201).

 (c)  
Fuel System Card File serviceable (AMM 28-22-16/401).

 (d)  
Fuel Quantity Indication System (FQIS) serviceable (AMM 28-41-00/501).

 (e)  
Integrated Display System (IDS) serviceable (AMM 31-61-00/501).

 (f)  
CDU installed (AMM 34-61-02/401).

 E.
Procedure

 S 865-002
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-003

 (2)  
Make sure these circuit breakers are closed:

 (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) 180M8, FUELING VALVE 2
 2) 180M9, FUELING PWR - HOT BAT
 3) 180C25, FUELING LTS PANEL
 4) 180C26, FUELING LTS RECP

 (c)  
On the left power distribution center, P414:
 1) 414F17, FUELING VALVE
 2) 414F22, FUELING PWR

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 865-004
 (3)  Use the auxiliary EICAS display to get access to the fuel quantity maintenance page (AMM 45-10-00/201).
 NOTE: If it is necessary, use the control display unit (CDU)
____
 NEXT PAGE or PREV PAGE keys to find the menu items.

 (a)  
Push the line select key (LSK) adjacent to the CMC on the control display unit (CDU) to show the CMC menu.

 (b)  
Push the CDU LSK adjacent to the EICAS MAINT PAGES to show the EICAS maintenance page menu.

 (c)  
Push the CDU LSK adjacent to the 28 FUEL to show the EICAS PAGE CONTROL menu.

 (d)  
Push the CDU LSK adjacent to the OTHER TANKS to show the fuel tank menu.

 (e)  
Push the CDU LSK adjacent to the RES 2/RES 3 to show the real time EICAS fuel maintenance page for the No. 2 and No. 3 reserve tanks.

 NOTE: The VTO SET value is at the bottom of the screen.
____
 S 015-006
 (4)  Open the electronics access door, 125B, to get access to the fuel quantity processor unit (FQPU).
 NOTE: The processor unit is immediately forward of the access door.
____
 S 865-029
 (5)  Look at the VTO decal to find the VTO value for each tank.
 NOTE: The VTO decal is found on the P54 panel.
____
 S 015-007
 (6)  Open the hinged door on the processor unit.
 S 915-025
 CAUTION: DO NOT TOUCH THE FUEL QUANTITY PROCESSOR UNIT BEFORE YOU DO THE
_______ PROCEDURE FOR DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE FUEL QUANTITY PROCESSOR UNIT.
 (7)  Do the procedure for devices that are sensitive to electrostatic discharge (AMM 20-41-02/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
　
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