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 29-11-17
 ALL  ú ú 01 Page 514 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 CASE DRAIN MODULE - MAINTENANCE PRACTICES
_________________________________________
 1.  General_______
 A.  This procedure contains these eight tasks:
 (1)  
Case Drain Module Removal

 (2)  
Case Drain Module Installation

 (3)  
Case Drain Filter Element Removal

 (4)  
Case Drain Filter Element Installation

 (5)  
Case Drain Module Check Valve Removal

 (6)  
Case Drain Module Check Valve Installation

 (7)  
Differential Pressure Indicator Removal

 (8)  
Differential Pressure Indicator Installation.

 B.  
It is necessary to open the fairing doors on the trailing edge of the strut to do these tasks.

 C.  
The installation of the case drain module is the same for each system.

 TASK 29-11-18-002-001
 2.  Case Drain Module 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

 (4)  
IPC 29-11-18 Fig. 5 (Outboard), IPC 29-11-18 Fig. 6 (Inboard)

 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 012-002
 (1)  Open the fairing doors on the trailing edge of the applicable strut (AMM 54-62-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-18
 ALL  ú ú 01 Page 201 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

6.  SCREW 7. DIFFERENTIAL PRESSURE (4 LOCATIONS) INDICATOR
8.  PACKING
SEE A
9.  BACKUP RING
AUXILIARY CHECK VALVE
10. CHECK VALVE PORT A
12. PACKINGPORT A
CHECK
1.  
ADAPTER

VALVE
2.  
JAMNUT

3.  
PACKING

4.  
BACKUP RING

14. PACKING
5.  
PACKING

11. BACKUP33. ADAPTER
2.  
JAMNUT RING

3.  
PACKING

13. BACKUP RING

4.  
BACKUP RING

5.  
PACKING

PORT B CHECK VALVE
PORT B 
1. ADAPTER 
2. JAMNUT 
3. PACKING 
4.  BACKUP RING 
5. PACKING 
PORT OUT 
SEE  B  C  15. 16.  PLUG PACKING  1 
17.  ADAPTER 
30.  BOLT  18.  JAMNUT 
31.  WASHERS (QTY 2)  19.  PACKING 
32. NUT  PORT  20.  BACKUP  2 
(3 LOCATIONS)  AUX  RING 
21.  PACKING 
29.  PACKING 
ENGINE-DRIVEN 
DRAIN FILTER PUMP CASE  28.  PACKING  FWD 

22. CASE27. FILTER ELEMENT
DEMAND PUMP CASE DRAIN FILTER
23.
PACKING

24.
VALVE

25.
PACKING

1 HYDRAULIC SYSTEMS 1,2, AND 3  A
26. MAGNETIC
2
HYDRAULIC SYSTEM 4 PLUG
Case Drain Module Filter Element, Check Valve, and
Differential Pressure Indicator Installation
Figure 201 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
　
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