S 864-026
 (12) Put the applicable wing ISLN switch (P5 Pilots' Overhead Panel) in the open position.
 NOTE: Make sure that the wing isolation valve moves to the
____
 open position.

 S 414-027
 (13)
 If it is necessary, install the water separator (AMM 21-51-05/201).

 (14)
 Apply the leak detector to the valve flanges.

 (15)
 Supply pressure to the pneumatic system (AMM 36-00-00/201).

 S 794-030

 (16)
 Examine the valve flanges for leakage:

 (a)  
If the bubbles come slowly into view, the quantity of the leakage is satisfactory.

 S 794-028
 S 794-029
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747-400 MAINTENANCE MANUAL
 (b)  If bubbles come quickly into view, or if a large leak occurs, you must repair the cause of the leakage.
 S 864-031
 (17)
 Release the pressure in the pneumatic system if it is not necessary for other operations (AMM 36-00-00/201).

 S 864-032

 (18)
 Remove electrical power if it is not necessary for other operations (AMM 24-22-00/201).

 S 414-033

 (19)
 Close the access door (AMM 06-09-03/201).

 TASK 36-11-07-704-040
 4.  Do the Operational Check of the Wing Isolation Valve____________________________________________________
 A. References
 (1)  
AMM 06-09-03/201, Body Section 44 Access Doors and Panels

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 36-00-00/201, Pneumatic System

 B. 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

 C. Procedure
 S 864-041
 (1)  
Supply the electrical power (AMM 24-22-00/201).

 S 014-042

 (2)  
Open the access door 192NR for the right isolation valve or 191NL for the left isolation valve (AMM 06-09-03/201).

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 S 864-055
 (3)  
Make sure the wing ISLN switch (P5 Pilots' Overhead Panel) is in the open position.

 S 864-056

 (4)  
Using a ground air source or the APU, pressurize the pneumatic system (AMM 36-00-00/201).

 S 214-057

 (5)  
Check the valve joints for leakage.

 (a)  
Diffused leakage is acceptable

 (b)  
Jet-blast type leakage must be repaired by joint or clamp realignment.

 S 864-043
 (6)  Put the applicable wing ISLN switch (P5 Pilots' Overhead Panel) to the closed position.
 NOTE: Make sure that the wing isolation valve moves to the
____
 closed position.

 S 864-044
 (7)  Put the applicable wing ISLN switch (P5 Pilots' Overhead Panel) to the open position.
 NOTE: Make sure that the wing isolation valve moves to the
____
 open position.

 S 864-054
 (8)  
Remove pneumatic pressure (AMM 36-00-00/201)

 S 864-045

 (9)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 414-046

 (10)
 Close the access door (AMM 06-09-03/201).

 TASK 36-11-07-204-047
 5. Do the Visual Check of the Wing Isolation Valves
________________________________________________
 A. References
 (1)  
AMM 06-09-03/201, Body Section 44 Access Doors and Panels
　
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