C.
Procedure

 S 012-067
 (1)  
On hydraulic systems 1 and 4, open the fairing doors on the trailing edge of the strut (AMM 54-62-00/201).

 S 492-068

 (2)  
On hydraulic systems 2 and 3, make sure the ground lockpins for the body gear are installed (AMM 09-11-00/201).

 S 862-069
 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 022-088

 (4)  
Remove the relief and differential pressure valve:

 (a)  
Remove the three mounting screws.

 (b)  
Remove the differential pressure valve.

 (c)  
Remove the return module.
 1) Discard the packings.

 S 432-090
 (5)  Install a cover on the opening to prevent contamination.
 TASK 29-11-29-402-072
 11. Relief and Differential Pressure Valve Installation (Fig. 201)
___________________________________________________
 A. Consumable Materials
 (1)  D00153 Fluid - Hydraulic, Fire Resistant BMS 3-11
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747-400
MAINTENANCE MANUAL

 (2)  
C00259 Primer - BMS 10-11, Type I, Class A

 B.
References

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

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

 (3)  
IPC 29-11-29 Fig. 1, 5, and 51

 C.
Access

 (1)  
Location Zone
 454 System 1 - Strut Aft Fairing
 735 System 2 - Wing Landing Gear Wheel Well
 745 System 3 - Wing Landing Gear Wheel Well
 484 System 4 - Strut Aft Fairing

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

 D.
Procedure

 S 422-089
 (1)  
Install the relief and differential pressure valve:

 (a)  
Lubricate the new packings and valve assembly threads with hydraulic fluid.

 (b)  
Install the packings on the valve assembly.

 (c)  
Install the valve assembly in the module.

 (d)  
Apply the primer on the three mounting screws.

 (e)  
Install the mounting screws while the primer is wet. 1) Tighten the screws. 2) Install lockwires on the screws.

 (2)  
Pressurize the hydraulic system (AMM 29-11-00/201).

 S 792-077

 (3)  
Examine the return module for leakage.

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

 S 862-076
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747-400 MAINTENANCE MANUAL
 S 862-078
 (4)  Release the pressure in the hydraulic system if it is not necessary for other operations (AMM 29-11-00/201).
 S 412-080 CAUTION: MAKE SURE YOU LATCH THE FAIRING DOORS ON THE TRAILING EDGE
_______ CORRECTLY. DAMAGE CAN OCCUR IF THE DOORS OPEN DURING A FLIGHT.
 (5)  On systems 1 and 4, close the fairing doors on the trailing edge of the strut (AMM 54-62-00/201).
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