Table 401
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A
747-400
MAINTENANCE MANUAL
FUEL QUANTITY PROCESSOR UNIT - REMOVAL/INSTALLATION
___________________________________________________
1. General
_______
A. This procedure contains instructions to remove and install the fuel quantity processor unit (FQPU) M7860 and the circuit cards installed in the FQPU. You can remove the FQPU with the circuit cards installed if the replacement FQPU contains new circuit cards.
B. The fuel quantity processor unit is found in the center equipment center, installed on the E6 equipment rack.
C. Access to the fuel quantity processor unit is through the electronics access door, 125B.
D. The VTO card is calibrated to the values written on a volumetric top off level decal (VTO decal). The VTO decal is found in the center equipment center, P54 panel, adjacent to the FQPU.
E. The values on the VTO decal are values that are calibrated at the factory. The VTO decal values are related to the airplane system installation and not related to (dependant on) the FQPU. These values are for one airplane only and do not change. When a new FQPU is installed, you must adjust the VTO card potentiometers in the FQPU to equal the factory calibrated values recorded on the VTO decal.
TASK 28-41-13-004-001
2. Fuel Quantity Processor Unit Circuit Card Removal (Fig. 401)
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A. References
(1)
AMM 20-41-02/201, Electrostatic Discharge Sensitive Devices
(2)
AMM 28-21-31/401, Refuel Valve Relay Card
(3)
AMM 28-41-15/401, Individual Fuel Quantity Channel Cards
(4)
AMM 28-41-16/401, Fuel Quantity Processor Input/Output Cards
(5)
AIPC 28-21-52, Fig. 1
B.
Access
(1)
Location Zone 125 Area Below Forward Cargo Container Compartment, Left
(2)
Access Panel
125B Electronics Access Door
C.
Procedure
S 864-028
(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 3) 180C25, FUELING LTS PANEL 4) 180C26, FUELING LTS RECP
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747-400
MAINTENANCE MANUAL
CENTER EQUIPMENT CENTER
SEE A
FWD
ELECTRONICS ACCESS DOOR, 125B
FUEL QUANTITY PROCESSOR UNIT
SEE B
E6 RACK
CENTER EQUIPMENT CENTER A
FUEL QUANTITY PROCESSOR UNIT
DOOR
ELECTRICAL FWD
CONNECTORS
FUEL QUANTITY PROCESSOR UNIT
B
Fuel Quantity Processor Unit Installation Figure 401
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A 747-400 MAINTENANCE MANUAL
(c) On 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 fuel quantity processor unit.
NOTE:____ The fuel quantity processor unit is immediately forward of the electronics access door.
(3) S 014-004Open the door on the fuel quantity processor unit.
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