S 862-038

 (3)  
Operate the bleed valve (13), on the module (1) for the reservoir pressurization, to release the pressure in the reservoir.

 S 032-039

 (4)  
Remove the four screws (24) and washers (25) from the check valve (5).

 S 022-040

 (5)  
Remove the check valve (5) from the module.

 S 032-079

 (6)  
Remove and discard the packings (22 and 23) from the check valve (5).

 TASK 29-17-01-402-041
 7. Check Valve Installation (Fig. 201)
________________________
 A. Consumable Materials
 (1)  
D00567 Lubricant - Skydrol Assembly Lube, MCS 352

 (2)  
G00095 Detector - Leak, Leak-Tek (160X)

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747-400 MAINTENANCE MANUAL
 B. Parts
 ~.............................................................................. | MM | | IPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 201 | 1 | Reservoir Pressurization Module | 29-17-01 | 02 | 1 | | | 5 | Check Valve | | | 15 | | | 22 | Packing | | | 35 | | | 23 | Packing | | | 30 | | | 24 | Screw | | | 20 | | | 25 | Washer | | | 25 | 2......…........…...................................…..........….....….........1
 C. Reference
 (1)  
AMM 36-00-00/201, Pneumatic System

 (2)  
AMM 54-62-00/201, Nacelle Strut Access Panels

 (3)  
AMM 54-62-02/501, Nacelle Strut Access Doors

 D.
Access

 (1)  
Location Zone
 454 System 1 - Strut Aft Fairing
 464 System 2 - Strut Aft Fairing
 474 System 3 - Strut Aft Fairing
 484 System 4 - Strut Aft Fairing

 (2)  
Access Panel 454AL Trailing Edge Fairing Doors - System 1 464AL Trailing Edge Fairing Doors - System 2 474AL Trailing Edge Fairing Doors - System 3 484AL Trailing Edge Fairing Doors - System 4

 E.
Procedure

 (1)  
Apply some lubricant to the packings (22 and 23).

 (2)  
Install the packings (22 and 23) on the check valve (5).

 S 422-081

 (3)  
Install the check valve (5) in the reservoir pressurization module (1).

 (4)  
Install the four screws (24) and washers (25).

 (5)  
Tighten the screws (24) to 20-25 pound-inches (2-3 N.m).

 S 642-042
 S 432-043
 S 432-082
 S 432-083
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747-400
MAINTENANCE MANUAL

 S 432-084
 (6)  
Safety the screws (24) with a lockwire.

 S 792-045

 (7)  
Apply some leak detector on the check valve.

 S 862-085

 (8)  
Pressurize the pneumatic system (AMM 36-00-00/201).

 S 792-046

 (9)  
Examine the check valve for leakage:

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

 (b)  
If you find a high concentration of leakage, you must repair the cause of the leakage.

 S 212-086
 (10)
 Examine the doors on the trailing edge fairing:

 (a)  
Examine the latches on the doors in the trailing edge fairing for cracks and wear.

 (b)  
Make sure that all latches are there.

 (c)  
Repair and adjust the latches if it is necessary (AMM 54-62-02/501).

 S 412-087
 CAUTION: MAKE SURE YOU LATCH THE DOORS ON THE TRAILING EDGE FAIRING
_______ CORRECTLY. IF THE DOORS OPEN DURING A FLIGHT, THIS CAN CAUSE DAMAGE TO THE DOORS.
　
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