S 864-008

 (8)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6 Main Power Distribution Panel 1) 6H20 L ISO VLV AIR SUPPLY PWR 2) 6H24 R ISO VLV AIR SUPPLY PWR

 S 034-009
 (9)  
Disconnect the electrical connector from the applicable isolation valve:

 (a)  
DV108 VALVE-WING ISOLATION L

 (b)  
DV109 VALVE-WING ISOLATION R

 S 014-010
 (10)
 If you must remove the left wing isolation valve, remove the pack No. 1 water separator to get access to the valve (AMM 21-51-05/201).

 S 034-011

 (11)
 Disconnect the bonding jumper from the valve.

 S 034-036

 (12)
 Remove the couplings from each side of the valve.

 (13)
 Remove the isolation valve.

 (14)
 Remove the seals from the duct flanges.

 (15)
 Examine the seals for damage.

 S 024-037
 S 034-013
 S 214-038
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A
747-400 MAINTENANCE MANUAL
 S 034-039
 (16)
 Replace all the seals that have damage.

 S 034-014

 (17)
 Put covers on the open ducts to keep out the unwanted objects.

 TASK 36-11-07-404-015
 3. Wing Isolation Valve Installation (Fig. 401)
_________________________________
 A. Consumable Materials
 (1) G00095 Detector - Leak, Leak-Tek (160X)
 B. References
 (1)
AMM 06-09-03/201, Body Section 44 Access Doors and Panels

 (2)
AMM 20-22-01/601, Electrical Bonding

 (3)
AMM 21-51-05/201, Water Separator

 (4)
AMM 24-22-00/201, Manual Control

 (5)
AMM 36-00-00/201, Pneumatic System

 C. Access
 (1)  
Location Zone 191 Fairing, Wing To Body, Forward Lower Half, LH 192 Fairing, Wing To Body, Forward Lower Half, RH

 (2)  
Access Panel
 191NL Air-Conditioning Access Door
 192NR Air-Conditioning Access Door

 D. Procedure
 S 434-016
 (1)
Remove the duct covers.

 S 434-017

 (2)
Install the seals in the duct flanges.

 S 424-018

 (3)
Put the isolation valve in its position between the duct flanges.

 NOTE: Make sure that the flow arrow points aft for the left
____ wing isolation valve, and inboard for the right wing isolation valve.
 S 434-019
 (4)
Install the couplings on each side of the valve.

 (5)
Tighten the couplings to 65-85 pound-inches (7-10 N.m).

 (6)
Connect the bonding jumper to the valve (AMM 20-22-01/601).

 S 434-020
 S 434-021
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A
747-400 MAINTENANCE MANUAL
 S 764-022
 (7)  
Make sure that the resistance between the ground stud on the valve and the aircraft frame (through the bonding jumper) is less than 0.0025 ohms.

 S 434-023

 (8)  
Connect the electrical connector to the valve:

 (a)  
DV108 VALVE-WING ISOLATION L

 (b)  
DV109 VALVE-WING ISOLATION R

 S 214-034
 (9)  
Do a visual check of the applicable wing isolation valve and electrical connections for the correct installation and condition.

 S 864-024

 (10)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6 Main Power Distribution Panel
 1) 6H20 L ISO VLV AIR SUPPLY PWR
 2) 6H24 R ISO VLV AIR SUPPLY PWR

 S 864-025
 (11) Put the applicable wing ISLN switch (P5 Pilots' Overhead Panel) in the closed position.
　
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