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A
747-400 MAINTENANCE MANUAL
INDIVIDUAL FUEL QUANTITY CHANNEL CARD - REMOVAL/INSTALLATION
____________________________________________________________
1. General_______
A. This procedure contains instructions to remove and install each indicating fuel quantity channel (IFQC) cards. There is one IFQC card for each main and reserve tank (six cards total) and one IFQC card for the center wing tank installed in the fuel quantity processor unit (FQPU) M7860. All the IFQC cards are interchangeable. The function of each IFQC card is specified by the tank identification jumpers on the FQPU mother board.
B. The FQPU is found below the forward cargo container compartment in the center of the equipment bay, installed on the E6 equipment rack. Access is through the electronics access door, 125B.
TASK 28-41-15-004-001
2. IFQC Card Removal (Fig. 401)_________________
A. References
(1)
AMM 20-11-22/401, Rack-Mounted Electrical/Electronic Components
(2)
AMM 20-41-02/201, Electrostatic Discharge Sensitive Devices
(3)
SSM 28-41-02, 28-41-03, 28-41-04, 28-41-05
(4)
WDM 28-41-12, 28-41-21, 28-41-22, 28-41-23, 28-41-24
(5)
AIPC 28-41-02, Fig. 10
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
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A
747-400
MAINTENANCE MANUAL
ELECTRONICS
FUEL QUANTITY ACCESS DOOR,
PROCESSOR UNIT 125B
SEE A
E6 RACK WINDOW
FWD
INPUT/OUTPUT
CARDS (REF)
REFUEL VALVE
INDIVIDUAL FUEL
RELAY CARD (REF)VTO QUANTITY CHANNEL HINGED
ADJUSTMENT
(IFQC) CARDS DOOR
CARD (REF)
FWD
LED INDICATOR
Y5CA2Y5CA3
Y5CA4
Y5CA5Y5CA6Y5CA7
Y5CA8Y5CA9Y5CA10
FUEL QUANTITY PROCESSOR UNIT
LIGHT
FUEL QUANTITY PROCESSOR UNIT (HINGED DOOR CLOSED)
A
HINGED CARD EQUIPMENT DOOR NUMBER
IFQC RESERVE 2 Y5CA004 IFQC MAIN 1 Y5CA005 IFQC MAIN 2 Y5CA006 IFQC CENTER Y5CA007 IFQC MAIN 3 Y5CA008
IFQC MAIN 4 Y5CA009
(HINGED DOOR OPEN)
IFQC RESERVE 3 Y5CA010
A
Individual Fuel Quantity Channel (IFQC) Cards
Figure 401
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747-400 MAINTENANCE MANUAL
(b)
On the DC power distribution panel, P180: 1) 180M8, FUELING VALVE 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
S 014-003
(2) Open the electronics access door, 125B, to get access to the FQPU.
NOTE: The FQPU is immediately forward of the electronics access
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