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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