S 216-538

 (3)  
Examine the differential pressure indicators on the pressure and return modules (Fig. 609).

 S 026-539

 (4)  
If a differential pressure indicator shows an unsatisfactory condition, replace the related filter element as follows:

 (a)  
Pressure module filter element (AMM 29-11-23/201)

 (b)  
Return module filter element (AMM 29-11-29/201).

 S 866-543
 (5)  
If it is necessary, push the button on the differential pressure indicator until it aligns with the adjacent surface.

 S 216-514

 (6)  
Examine the doors on the trailing edge fairing.

 (a)  
Examine the trailing edge fairing door latches for cracks and wear.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-00
 ALL  ú ú 01 Page 680 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (b)  
Make sure that all latch assemblies are installed.

 (c)  
Repair and adjust the latches if it is necessary (AMM 54-62-03/501).

 S 416-515
 CAUTION: MAKE SURE YOU LATCH THE FAIRING DOORS ON THE TRAILING EDGE
_______ CORRECTLY. DAMAGE CAN OCCUR IF THE DOORS OPEN DURING A FLIGHT.
 (7)  Close the doors on the trailing edge fairing (AMM 54-62-00/201).
 TASK 29-11-00-486-701
 11. Differential Pressure Indicators Inspection for the Case Drain Filters
______________________________________________________________________
 A. References
 (1)  
AMM 29-11-18/201, Case Drain Module

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

 (3)  
AMM 54-62-02/501, Nacelle Strut Access Doors

 (4)  
AMM 54-62-03/501, Trailing Edge Fairing 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

 (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

 (1)
Open the doors on the trailing edge fairing (AMM 54-62-00/201).

 S 216-540

 (2)  
Examine the differential pressure indicators on the case drain modules (Fig. 609).

 S 016-519
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-00
 ALL  ú ú 01 Page 680A ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 026-541
 (3)  
If a differential pressure indicator shows an unsatisfactory condition, replace the filter element in the case drain module (AMM 29-11-18/201).

 S 866-542

 (4)  
If it is necessary, push the button on the differential pressure indicator until it aligns with the adjacent surface.

 S 216-536

 (5)  
Examine the doors on the trailing edge fairing.

 (a)  
Examine the trailing edge fairing door latches for cracks and wear.

 (b)  
Make sure that all latch assemblies are installed.

 (c)  
Repair and adjust the latches if it is necessary (AMM 54-62-03/501).

 S 416-537
 CAUTION: MAKE SURE YOU LATCH THE FAIRING DOORS ON THE TRAILING EDGE
_______ CORRECTLY. DAMAGE CAN OCCUR IF THE DOORS OPEN DURING A FLIGHT.
 (6)  Close the doors on the trailing edge fairing (AMM 54-62-00/201).
 TASK 29-11-00-206-702
 12. Case Drain Filter Check
___________________________
 A. References
 (1)  
29-11-18/201, Case Drain Module

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

 (3)  
54-62-02/501, Nacelle Strut Access Doors
　
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