FUEL PUMP, FUEL METERING UNIT, FUEL METERING UNIT ADAPTER FWD
FUEL PUMP
B
FUEL PUMP FUEL INLET
FUEL SECONDARY FILTER
PRIMARY
MANIFOLD FWD
MANIFOLD
FUEL PUMP FUEL NOZZLE
OUTLET ADAPTER
FILTER
FLOW DIVIDER (14 LOCATIONS)AND DUMP VALVE
ELECTRICAL CONNECTOR (REF)
FUEL MANIFOLDS, FUEL NOZZLES, ADAPTERS, FUEL PUMP FLOW DIVIDER AND DUMP VALVE
D C
APU Fuel System - Component Location Figure 102
F58308
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49-31-00
ALL ú ú 02 Page 102 ú Feb 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
APU ENGINE FUEL SYSTEM - MAINTENANCE PRACTICES
______________________________________________
1. General_______
A. This procedure has these tasks:
(1)
The removal of the fuel pump inlet screen
(2)
The installation of the fuel pump inlet screen
(3)
The cleaning of the fuel pump inlet screen
(4)
The removal of the fuel pump outlet filter element
(5)
The installation of the fuel pump outlet filter element
(6)
The removal of the fuel pump cover plug
(7)
The installation of the fuel pump cover plug
(8)
The removal of the flow divider and dump valve
(9)
The installation of the flow divider and dump valve.
B.
The inlet screen and spring assembly and outlet filter element are installed in the fuel pump. The cover plug is installed on the fuel pump. The flow divider and dump valve is installed on the fuel manifold at the six o'clock position.
TASK 49-31-00-002-001
2. Fuel Pump Inlet Screen Removal (Fig. 201)______________________________
A. Equipment
(1)
Container - Fuel Resistant, 1 U.S. Gallon (4 Liters)
B.
Access
(1)
Location Zones
221 Control Cabin - Left
222 Control Cabin - Right
310 Fuselage - Station 2360 to Station 2792
(2)
Access Panels
317AL APU Access Door - Left
318AR APU Access Door - Right
C.
Prepare for the Removal
S 862-087
(1)
Make sure the APU control switch on the P5 overhead panel is OFF and attach a DO-NOT-OPERATE tag.
S 862-088
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P6-2 Main Power Distribution Panel
1) 6K18, APU ALTN CONT
(b)
P83 Aft APU Equipment Control and Circuit Breaker Panel 1) APU PRIME CONT
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 012-089
(3)
Open the left APU access door, 317AL, and right APU access door, 318AR:
(a)
While you hold the two APU access doors in the closed position, open the six latches on the right access door.
NOTE: The left access door will open fully and the right
____ access door will drop approximately one inch (2.5 cm) from the fuselage frame when the last latch is opened.
NOTE: A lanyard is attached to the aft end of the right access
____ door to hold the access door to the APU compartment bulkhead.
CAUTION: BE CAREFUL NOT TO MOVE THE TWO APU ACCESS DOORS TO THE
_______ OUTBOARD SIDE FROM THE FULL OPEN POSITION. THE FULL OPEN POSITION IS WHERE THE APU ACCESS DOOR IS DOWN AND THE TWO HOLD-OPEN RODS ARE CONNECTED TO THE TWO BRACKETS ON THE APU COMPARTMENT BULKHEAD. DAMAGE TO THE ELEVATOR CONTROL SURFACES CAN OCCUR.
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