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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 D.  Procedure
 S 642-070
 (1)  
Lubricate the packings, the backup rings, and the component threads with hydraulic fluid.

 S 422-113

 (2)  
Install the pressure check valve:

 (a)  
Remove the cap from the check valve port.

 (b)  
Install the packings and the backup rings on the check valve.

 (c)  
Install the check valve for the ground disconnect, the demand pump, or the EDP, in the pressure module. 1) On the pressure module of the Sterer type,

 Tighten the check valve to 360-440 pound-inches (40-50 N.m).
 2)  On the pressure module of the Ronson/Hydraulic type, Tighten the check valve to 450-550 pound-inches (50-60 N.m).
 (d)  Install the check valve for the auxiliary pump: 1) Install the check valve in the pressure module. 2) Tighten the check valve to 270-330 pound-inches
 (30-37 N.m).
 S 862-074
 (3)  
Pressurize the hydraulic system (AMM 29-11-00/201).

 S 792-075

 (4)  
Examine the check valve installation for leakage.

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

 S 862-076
 (5)  Release the pressure in the hydraulic system if it is not necessary (AMM 29-11-00/201).
 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.
 (6)  Close the left door on the applicable trailing edge fairing (AMM 54-62-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-23
 ALL  ú ú 02 Page 214 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 TASK 29-11-23-002-079
 10. Differential Pressure Indicator 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 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

 S 012-080
 (1)  Open the left door on the applicable trailing edge fairing (AMM 54-62-00/201).
 S 862-081
 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).
 S 862-082
 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 022-083

 (4)  
Remove the indicator for differential pressure:

 (a)  
Remove the screws that attach the indicator to the pressure module.

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