(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

 E.
Procedure

 S 642-026
 (1)  
Apply some lubricant to all packings and the threads of the filter cap.

 S 432-095

 (2)  
Install the packing (21) on the restrictor (20).

 S 432-027

 (3)  
Install the packing (19) in the filter element (18).

 S 432-028

 (4)  
Install the packing (17) on the filter cap (16).

 S 422-073

 (5)  
Install the restrictor (20) and the filter element (18) in the module (1) for the reservoir pressurization.

 S 432-074

 (6)  
Install the filter cap (16).

 S 422-029

 (7)
Tighten the filter cap (16) to 75-95 pound-inches (9-10 N.m).

 S 792-030

 (8)  
Apply some leak detector on the filter cap (16).

 (9)  
Pressurize the pneumatic system (AMM 36-00-00/201).

 S 862-075
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 S 792-076
 (10)
 Examine the filter cap (16) for leakage:

 (a)  
If bubbles come slowly into view, the quantity of leakage is satisfactory.

 (b)  
If you find a high concentration of bubbles, you must repair the cause of the leakage.

 S 422-098
 (11)
 Safety the filter cap (16) with lockwire.

 S 422-099

 (12)
 Put the seal (26) on the lockwire.

 S 422-101

 (13)
 Apply a bead of sealant to the joint between the cap and the reservoir pressurization module.

 S 212-077

 (14)
 Examine the doors on the trailing edge fairing:

 (a)  
Examine the latches on the doors in the trailing edge fairing for cracks and wear.

 (b)  
Make sure that all latches are there.

 (c)  
Repair and adjust the latches if it is necessary (AMM 54-62-02/501).

 S 412-078
 CAUTION: MAKE SURE YOU LATCH THE DOORS ON THE TRAILING EDGE FAIRING
_______ CORRECTLY. IF THE DOORS OPEN DURING A FLIGHT, THIS CAN CAUSE DAMAGE TO THE DOORS.
 (15)
 Close the doors in the trailing edge fairing (AMM 54-62-00/201).

 S 862-034

 (16)
 Release the pressure in the pneumatic system if it is not necessary (AMM 36-00-00/201).

 TASK 29-17-01-002-035
 6. Check Valve Removal (Fig. 201)
___________________
 A. References
 (1)  
AMM 36-00-00/201, Pneumatic System

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

 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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 02 Page 210 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (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 012-036
 (1)  Open the doors in the trailing edge fairing (AMM 54-62-00/201).
 S 862-080
 WARNING: YOU MUST RELEASE THE PRESSURE IN THE PNEUMATIC SYSTEM BEFORE
_______ YOU OPEN THE PNEUMATIC SYSTEM. THE AIR, WHICH HAS HIGH TEMPERATURE AND PRESSURE, CAN CAUSE INJURY TO PERSONS.
 (2)  
　
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