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A
747-400 MAINTENANCE MANUAL
 REFUEL VALVE RELAY CARD - REMOVAL/INSTALLATION
______________________________________________
 1.  General_______
 A.  This procedure contains instructions to remove and install the refuel valve relay card. The relay card is in the fuel quantity processor unit (FQPU).
 B.  The FQPU is in the center of the equipment center. The FQPU is installed on the E6 equipment rack. You can get access to the FQPU through the electronics access door, 125B.
 TASK 28-21-31-004-001
 2.  Refuel Valve Relay Card Removal (Fig. 401)_______________________________
 A.  References
 (1)  
AMM 20-11-22/401, Rack-Mounted Electrical/Electronic Module

 (2)  
AMM 20-41-02/201, Electrostatic Discharge Sensitive Devices

 (3)  
AIPC 28-41-02, Fig. 10

 (4)  
SSM 28-21-03, 28-21-04

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

 B.  
Access

 (1)  
Location Zone 125 Area Below Forward Cargo Container Compartment, Left

 (2)  
Access Panel
 125B Electronics Access Door

 C.  
Procedure

 S 864-002
 (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) 180M8, FUELING VALVE 2 2) 180M9, FUELING PWR - HOT BAT

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 28-21-31
 ALL  ú ú 05 Page 401 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

FUEL QUANTITY
PROCESSOR UNIT

SEE A
ACCESS DOOR 125B 
E6 RACK  WINDOW 
FWD 
CARD (REF) ADJUSTMENT VTO  REFUEL VALVE RELAY CARD  QUANTITY CHANNEL INDIVIDUAL FUEL CARDS (REF) INPUT/OUTPUT CARDS (REF)  FWD  DOOR HINGED 

Y5CA13
FUEL QUANTITY PROCESSOR UNIT (HINGED DOOR CLOSED)
A
HINGED  EQUIPMENT 
DOOR  CARD  NUMBER 
REFUEL VALVE  Y5CA013 
RELAY CARD 

FUEL QUANTITY PROCESSOR UNIT (HINGED DOOR OPEN)
A
Refuel Valve Relay Card
Figure 401

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 28-21-31
 ALL  ú ú 01 Page 402 ú Jun 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 (c)  3) 180C25, FUELING LTS PANEL 4) 180C26, FUELING LTS RECPOn the left power distribution center, P414: 1) 414F17, FUELING VALVE 2) 414F22, FUELING PWR
 (2)  S 014-003Open the electronics access door, 125B, to get access to the FQPU.
 NOTE:____ The processor unit is immediately forward of the access door.
 (3)  S 014-004Open the front cover on the processor unit.
 S 024-005

 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.
 (4)  
Do the procedure for devices that are sensitive to electrostatic discharge (AMM 20-41-02/201).

 S 024-011

 (5)  
Remove the applicable I/O card from the FQPU (AMM 20-11-22/401).

 TASK 28-21-31-404-006
 3. Refuel Valve Relay Card Installation
____________________________________
 A. References
 (1)
AMM 20-11-22/401, Rack-Mounted Electrical/Electronic Module

 (2)  
AMM 20-41-02/201, Electrostatic Sensitive Devices

 (3)  
SSM 28-21-03, 28-21-04

 (4)  
WDM 28-21-21, 28-21-22, 28-21-23, 28-21-24

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