S 422-091

 (3)  
Install the bleed valve (13) on the reservoir pressurization module (1).

 (4)
Tighten the bleed valve (13) to 50-65 pound-inches (6-7 N.m).

 (5)  
Apply some leak detector on the bleed valve (13).

 (6)  
Pressurize the pneumatic system (Ref 36-00-00/201).

 S 432-057
 S 432-090
 S 792-059
 S 862-092
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 S 792-060
 (7)  
Examine the bleed valve (13) 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 212-093
 (8)  
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 412-094
 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.
 (9)  
Close the doors in the trailing edge fairing (AMM 54-62-00/201).

 S 862-063

 (10)
 Release the pressure in the pneumatic system if it is not necessary (AMM 36-00-00/201).

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 RESERVOIR PRESSURE RELIEF VALVE - REMOVAL/INSTALLATION
______________________________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task removes the pressure relief valve for the hydraulic reservoir. The second task installs the pressure relief valve.
 B.  You must open the doors in the trailing edge fairing to get access for these tasks.
 TASK 29-17-07-004-001
 2.  Reservoir Pressure Relief Valve Removal (Fig. 401)_______________________________________
 A.  References
 (1)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (2)  
AMM 36-00-00/201, Pneumatic System

 (3)  
AMM 54-62-00/201, Nacelle Strut Access Panels

 B.  
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

 C.  
Procedure

 S 014-002
 (1)  
Open the door in the applicable trailing edge fairing (AMM 54-62-00/201).

 (2)
Remove the pressure from the hydraulic system (AMM 29-11-00/201).

 (3)
Remove the pressure from the pneumatic system (AMM 36-00-00/201).

 S 864-003
 S 864-004
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747-400
MAINTENANCE MANUAL

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