(b)  
Install the pressure relief valve in the pressure module.

 1)  Tighten the pressure relief valve to 630-770 pound-inches (70-80 N.m).

 (c)  
Install a lockwire on the pressure relief valve.

 S 422-119
 (3)  
Tighten the mount bolts of the pressure module and clamps of reservoir pressurization tube on the diagonal brace, as necessary.

 (4)
Do this task: Hydraulic Reservoir Servicing (AMM 12-12-01/301).

 (5)  
Pressurize the hydraulic system (AMM 29-11-00/201).

 S 792-112

 (6)  
Examine the pressure relief valve for leakage.

 (a)
If you find leakage, repair the cause of the leak.

 S 612-059
 S 862-060
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-23
 ALL  ú ú 01 Page 211 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 412-062
 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.
 (7)  Close the left door on the applicable trailing edge fairing (AMM 54-62-00/201).
 TASK 29-11-23-002-063
 8. Pressure Check Valve Removal (Fig. 201)
____________________________
 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 012-065
 (1)  Open the left door on the applicable trailing edge fairing (AMM 54-62-00/201).
 S 862-064
 WARNING: MAKE SURE YOU RELEASE THE PNEUMATIC SYSTEM PRESSURE BEFORE YOU
_______ OPEN THE HYDRAULIC SYSTEM. THE PNEUMATIC SYSTEM PRESSURIZES THE HYDRAULIC RESERVOIR. HYDRAULIC FLUID THAT HAS PRESSURE CAN CAUSE INJURY TO PERSONS.
 (2) Release the pressure in the pneumatic system (AMM 36-00-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-23
 ALL  ú ú 01 Page 212 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 862-066
 WARNING: MAKE SURE YOU RELEASE THE HYDRAULIC SYSTEM PRESSURE BEFORE YOU
_______ OPEN THE HYDRAULIC SYSTEM. HYDRAULIC FLUID THAT HAS PRESSURE CAN CAUSE INJURY TO PERSONS.
 (3)
Release the pressure in the hydraulic system (AMM 29-11-00/201).

 S 022-067

 (4)
Remove the pressure check valve:

 (a)
Remove the pressure check valve with a wrench.

 (b)
Discard the packings and the backup rings.

 (c)
Install a cap on the open port to keep contamination out.

 TASK 29-11-23-402-069
 9. Pressure Check Valve Installation (Fig. 201)
_________________________________
 A. Consumable Materials
 (1)
D00153 Fluid - Hydraulic, Fire Resistant, BMS 3-11

 B.
References

 (1)
AMM 29-11-00/201, Main Hydraulic Supply System

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

 (3)
IPC 29-11-23 Fig. 1

 C.
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
　
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