S 034-035
(6)
Disconnect the bonding jumper (4) from the ground strap.
S 034-036
(7)
Remove the couplings (2) from each side of the APU isolation valve (1).
S 024-037
(8)
Remove the valve.
S 034-012
(9)
Remove the seals (5) from the duct flanges.
(a)
Replace the seals if they have damage.
(10)
Put covers on the open ducts to keep out unwanted objects.
S 034-013
TASK 36-11-09-404-014
3. Install the APU Isolation Valve (Fig. 401)
_______________________________
A. Consumable Materials
(1) G00095 Detector - Leak, Leak-Tek (160X)
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A
747-400
MAINTENANCE MANUAL
~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 1 | APU Isolation Valve | | | | | | 2 | Coupling | | | | | | 5 | Seal | | | | | | 6 | Nut | | | | | | 7 | Washer | | | | | | 8 | Bolt | | | | 2......…........…...................................…..........…......…........1
B. References
(1)
AMM 20-22-01/601, Electrical Bonding
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 32-00-30/201, Landing Gear Door Locks
(4)
AMM 36-00-00/201, Pneumatic System
(5)
AMM 49-11-00/201, Auxiliary Power Unit
C.
Access
(1)
Location Zone
137A Body Landing Gear Wheel Well, LH
D.
Procedure
S 434-015
(1)
Remove the duct covers.
S 434-016
(2)
Install the seals (5) in the duct flanges.
S 424-017
(3)
Install the APU isolation valve (1) in the correct position between the duct flanges.
NOTE: Make sure the flow arrow points in the forward direction.
____
S 434-018
(4)
Install the couplings (2) on each side of the valve (1).
(a)
Tighten the valve to 65-85 pound-inches (7-10 N.m).
S 434-019
(5)
Use the bolt (8), the washer (7), and the nut (6) to attach the bonding jumper (4) to the valve (1) (AMM 20-22-01/601).
S 864-038
(6)
Put the APU BLEED switch on the overhead panel, P5, to the ON position.
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747-400 MAINTENANCE MANUAL
S 984-021
(7)
Turn the manual override drive on the valve (1) to put the valve in the OPEN position.
S 434-022
(8)
Connect the electrical connector DV121 (3) to the valve (1).
S 214-044
(9)
Do a visual check of the APU isolation valve and the electrical connections.
NOTE: You will examine the valve and the electrical connections
____ for the correct installation and for the condition.
S 864-023
(10)
Remove the DO-NOT-CLOSE tag and close this circuit breaker on the main power distribution panel, P6:
(a)
6H22 APU ISO VLV AIR SUPPLY PWR
S 714-046
(11)
Do the steps that follow to do the test for the installation:
(a)
Put the APU BLEED switch to the OFF position. 1) Make sure the valve (1) moves to the CLOSE position.
(b)
Put the two wing ISLN switches on the overhead panel, P5, to the CLOSED position.
(c)
Apply leak detector to the valve flanges.
