S 862-047

 (7)
Release the pressure in the hydraulic system (AMM 29-11-00/201).

 TASK 29-11-23-002-048
 6. Pressure Relief Valve Removal (Fig. 201)
_____________________________
 A. References
 (1)  
AMM 12-12-01/301, Hydraulic Systems

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

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

 (4)  
AMM 54-62-00/201, Nacelle Strut Access Doors

 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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-23
 ALL  ú ú 01 Page 209 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (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 012-049
 (1)  Open the left door on the applicable trailing edge fairing (AMM 54-62-00/201).
 S 862-050
 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).
 S 862-051
 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 682-052

 (4)
Drain the hydraulic fluid from the reservoir (AMM 12-12-01/301).

 S 022-053

 (5)  
Remove the pressure relief valve:

 NOTE: Loosen the mount bolts of the pressure module and
____ clamps of the reservoir pressurization tube on the diagonal brace, as necessary.
 (a)  
Remove the pressure relief valve from the pressure module with a wrench.

 (b)  
Remove the packings and the backup rings from the pressure relief valve. 1) Discard the packings and the backup rings.

 TASK 29-11-23-402-055
 7. Pressure Relief Valve Installation (Fig. 201)
__________________________________
 A. Consumable Materials
 (1)  
D00153 Fluid-Hydraulic, Fire Resistant, BMS 3-11

 B.
References

 (1)  
AMM 12-12-01/301, Hydraulic Systems

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-23
 ALL  ú ú 05 Page 210 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

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

 (4)  
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

 D.  
Procedure

 S 642-056
 (1)  
Lubricate the packings, the backup rings, and the component threads with hydraulic fluid.

 S 422-057

 (2)  
Install the pressure relief valve:

 (a)  
Install the packings and the backup rings on the pressure relief valve.
　
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