C.
Procedure

 S 012-023
 (1)  Open the fairing doors on the trailing edge of the applicable strut (AMM 54-62-00/201).
 S 862-024
 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

 29-11-18
 ALL  ú ú 02 Page 208 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 862-025
 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 022-073

 (4)  
Remove the filter element for the case drain:

 (a)  
Remove the lockwire from the case (22).

 (b)
Loosen the case (22) and remove it from the module.

 NOTE: Do not remove the packing (29) from the case drain
____ module. A spring-loaded valve in the case drain module moves to seal against the packing (29) when you remove the case (22). If the packing (29) has a leak, you must replace the case drain module.
 (c)  
Remove the filter element (27) and the packing (28). 1) Discard the element and the packing.

 (d)  
Remove the lockwire from the magnetic plug (26).

 (e)  
Remove the magnetic plug (26).

 (f)  
Discard the packing (25).

 (g)  
Examine the magnetic plug for particles.

 (h)  
At regular intervals, check element and magnetic plug for contamination. If excessive amount of metal particles are found, replace associated pump, clean filter bowl and replace elements.

 NOTE: Excessive is offered as a guide and relies on operator
____ and individual mechanic experience. Examine other system filters and magnetic plugs to gain a relative measurement between hydraulic systems. If particles are starting to accumulate quickly or becoming larger, this is the sign to examine or replace the hydraulic pump.
 TASK 29-11-18-402-028
 5.  Case Drain Filter Element Installation (Fig. 201)______________________________________
 A. Consumable Materials
 (1)  D00567 Skydrol Assembly Lube MCS 352
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-18
 ALL  ú ú 01 Page 209 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 B. Parts
 ~.............................................................................. | MM | | IPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 201 | 22 | Case | 29-11-18 | 01 | 65 | | | 23 | Packing | | | 25 | | | 24 | Valve | | | 15 | | | 25 | Packing | | | 20 | | | 26 | Magnetic plug | | | 10 | | | 27 | Filter element | | | 35 | | | 28 | Packing | | | 40 | | | 29 | Packing | | | 30 | 2......…........…...................................…..........….....….........1
 C. References
 (1)  
AMM 29-11-00/201, Main Hydraulic Supply System

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

 D.
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
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 液壓 HYDRAULIC 2(25)