(j)
While you hold the fuel drain tube (3) and elbow (4) in position, tighten the coupling nut on the fuel drain tube to 270-300 inch-pounds (30.5-33.9 newton-meters).
(k)
While you hold the fuel drain tube (3) and elbow (4) in position, tighten the nut (5) to 70-80 inch-pounds (7.9-9.0 newton-meters).
NOTE: Use an open-end wrench on the coupling nut of the fuel
____ drain tube or the flat side of the elbow (4) to hold the fuel drain tube and elbow in position while you tighten the nut (5).
(l)
Lubricate the two new packings (9) with a light coat of fuel.
(m)
Install the two packings (9) on the transfer tube (8).
(n)
Install the transfer tube (8) in the flow divider and dump valve (1).
(o)
Connect the fuel pressure tube (10) to the flow divider and dump valve (1). 1) Tighten the coupling nut on the fuel pressure tube (10) to
320-350 inch-pounds (36.2-39.6 newton-meters).
F. Flow Divider and Dump Valve Installation Test
S 862-084
(1)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(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
S 862-085
(2)
Remove the DO-NOT-OPERATE tag from the APU control switch on the P5 overhead panel.
S 792-118
(3)
Do the installation test for the flow divider and dump valve:
(a)
Do this task: APU Starting and Operation (AMM 49-11-00/201).
(b)
Operate the APU for a minimum of five minutes.
(c)
During the APU operation, examine the flow divider and dump valve for signs of fuel leakage.
(d)
If you find fuel leakage, then do these steps to repair the leakage: 1) Do this task: APU Usual Shutdown (AMM 49-11-00/201). 2) Attach a DO-NOT-OPERATE tag to the APU control switch on
the P5 overhead panel. 3) Repair the cause of the fuel leakage. 4) Remove the DO-NOT-OPERATE tag from the APU control switch
on the P5 overhead panel. 5) Do this task: APU Starting and Operation (AMM 49-11-00/201).
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ALL ú ú 03 Page 224 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
6) During the APU operation, examine the flow divider and dump valve for signs of fuel leakage. 7) If you find fuel leakage, do the leakage repair again.
(e)
If it is not necessary to do other tasks, do this task: APU Usual Shutdown (AMM 49-11-00/201).
G.
Put the Airplane Back to Its Usual Condition
S 412-086
(1)
Close the left APU access door, 317AL, and right APU access door, 318AR:
(a)
Remove the two quick-release pins, disconnect the two hold-open rods and put the two hold-open rods in the two clips on the right access door.
(b)
Install the two quick-release pins in the two brackets on the right APU compartment bulkhead.
(c)
Lift the right access door until you can install the lanyard on the pin at the aft APU compartment bulkhead.
NOTE: The lanyard will hold the right access door on the
____
APU compartment bulkhead.
(d)
Remove the two quick-release pins, disconnect the two hold-open rods and put the two hold-open rods in the two clips on the left access door.
(e)
Install the two quick-release pins in the two brackets on the left APU compartment bulkhead.
(f)
Make sure the insulation covers are correctly attach to the APU compartment firewall.
(g)
Lift the left access door until the two APU access doors are approximately aligned.
(h)
Close the two APU access doors.
(i)
Close the six latches on the right access door.
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