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

 D.
Procedure

 S 422-084
 (1)  
Install the return filter element:

 (a)  
Lubricate the new packings and the filter bowl threads with hydraulic fluid.

 S 422-091
 (2)  Install the packing for the filter case (View A-A).
 NOTE:____There are two packings supplied with each filter kit. It is not always necessary to replace the upper packing each time you replace the filter element.
 (a)  
Install the new filter element on the fitting on the module.

 (b)  
Install the filter case.

 (c)  
Tighten the case to 540-600 pound-inches (60-65 N.m).

 (d)  
Install a lockwire on the filter case.

 (e)  
Install the retainer clamp on the module.

 (3)  
Pressurize the hydraulic system (AMM 29-11-00/201).

 S 792-033

 (4)  
Examine the return module for leakage.

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

 S 862-032
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-29
 ALL  ú ú 03 Page 206 ú Feb 18/02
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A
747-400 MAINTENANCE MANUAL
 S 862-034
 (5)  Release the pressure in the hydraulic system if it is not necessary for other operations (AMM 29-11-00/201).
 S 412-036
 CAUTION: MAKE SURE YOU LATCH THE FAIRING DOORS ON THE TRAILING EDGE
_______ CORRECTLY. DAMAGE CAN OCCUR IF THE DOORS OPEN DURING A FLIGHT.
 (6)  On systems 1 and 4, close the fairing doors on the trailing edge of the strut (AMM 54-62-00/201).
 TASK 29-11-29-002-037
 6. Differential Pressure (.P) Indicator Removal (Fig. 201)
____________________________________________
 A. References
 (1)  
AMM 09-11-00/201, Towing and Taxiing

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

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

 (4)  
IPC 29-11-29 Fig. 1, 5, and 51

 B.
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

 C.
Procedure

 S 012-038
 (1)  On hydraulic system 1 and 4, open the fairing doors on the trailing edge of the strut (AMM 54-62-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-29
 ALL  ú ú 03 Page 207 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 492-039
 (2)  On hydraulic systems 2 and 3, make sure the ground lockpins for the body gear are installed (AMM 29-11-00/201).
 S 862-040
 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 022-085

 (4)  
Remove the differential pressure indicator:

 (a)  
Remove the four mounting screws.

 (b)  
Remove the differential pressure indicator from the return module.

 S 432-042
 (5)  Install a cap on the opening to prevent contamination.
 TASK 29-11-29-402-043
 7. Differential Pressure (.P) Indicator Installation (Fig. 201)
_________________________________________________
 A. Consumable Materials
　
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