E.
Procedure
S 424-034
CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY.
_______ IF YOU DO NOT REMOVE THE PROTECTION COVERS, DAMAGE TO THE APU CAN OCCUR.
(1)
Do these steps to install the fuel metering adapter (1):
(a)
Lubricate the new packing (9) with a light coat of fuel.
(b)
Install the packing (9) on the nipple (8).
(c)
Install the nipple (8) on the fuel metering adapter (1).
1) Tighten the nipple (8) to 110-120 inch-pounds (12.4-13.6 newton-meters).
(d)
Lubricate the new packing (2) with a light coat of fuel.
(e)
Install the nut (4) and a new ring (3) on the elbow (6).
(f)
Install the packing (2) and then the elbow (6) (with the nut (4) and ring (3)) on the fuel metering adapter (1).
(g)
Tighten the nut (4) with your fingers.
(h)
Lubricate the two new packings (12) with a light coat of fuel.
(i)
Install the two packings (12) on the fuel metering adapter (1).
(j)
Put the fuel metering adapter (1) on the fuel pump.
(k)
Install the fuel metering adapter (1) on the fuel pump with the five washers (11) and five nuts (10). 1) Tighten the five nuts (10) to 75-85 inch-pounds (8.5-9.6
newton-meters).
(l)
Connect the fuel return tube (7) to the nipple (8).
(m)
While you hold the nipple (8) in position, tighten the coupling nut on the fuel return tube (7) to 270-300 inch-pounds (30.5-33.9 newton-meters).
NOTE: Use an open-end wrench on the nipple (8) to hold the
____ nipple in position while you tighten the coupling nut on the fuel return tube (7).
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747-400 MAINTENANCE MANUAL
(n)
Connect the fuel supply tube (5) to the elbow (6).
(o)
While you hold the fuel supply tube (5) and elbow (6) in position, tighten the coupling nut on the fuel supply tube to 270-300 inch-pounds (30.5-33.9 newton-meters).
(p)
While you hold the fuel supply tube (5) and elbow (6) in position, tighten the nut (4) to 70-80 inch-pounds (7.9-9.0 newton-meters).
NOTE: Use an open-end wrench on the coupling nut of the fuel
____ supply tube (5) or the flat side of the elbow (6) to hold the fuel supply tube and elbow in position while you tighten the nut (4).
S 424-035
(2) Do this task: Fuel Metering Unit Installation (AMM 49-31-01/401).
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747-400 MAINTENANCE MANUAL
FUEL PUMP - REMOVAL/INSTALLATION
________________________________
1. General_______
A. This procedure contains the tasks to remove and install the APU fuel pump.
B. The APU fuel pump is installed on the aft side of the accessory gearbox. It is necessary to remove the fuel metering unit (FMU) and the fuel metering adapter to remove the fuel pump.
C. You can get access to the APU fuel pump through the APU access doors.
TASK 49-31-03-004-001
2. Fuel Pump Removal (Fig. 401)_________________
A. References
(1)
49-31-02/401, Fuel Metering Adapter
(2)
WDM 49-11-11
(3)
SSM 49-11-01
(4)
IPC 49-31-03 Fig. 1
B.
Access
(1)
Location Zone 317 APU Compartment-Bottom of APU Aft of Accessory Gearbox, LH
318 APU Compartment-Bottom of APU Aft of Accessory Gearbox, RH
(2)
Access Panel
317AL APU Access Door
318AR APU Access Door
C.
Procedure
(1)
Do this task: "Fuel Metering Adapter Removal" (Ref 49-31-02/401).
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