32-41-14
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (4)  
AMM 32-00-30/201, Landing Gear Door Locks

 (5)  
AIPC 32-41-14 Fig. 2

 (6)  
SSM 32-41-02

 (7)  
WDM 32-41-11

 C.
Access

 (1)  
Location Zone
 135 Wing Landing Gear Well - Left

 D.
Prepare for the Removal

 S 844-046
 (1)  
Make sure the landing gear ground locks are installed
 (AMM 09-11-00/201).

 S 844-048

 (2)  
Make sure the wheel chocks are installed.

 S 844-039

 (3)  
If necessary, release the parking brake.

 S 494-050
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (4)  
Do this task: "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).

 S 494-052

 (5)  
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).

 S 844-040

 (6)  
Supply electrical power (AMM 24-22-00/201).

 (7)
Remove the pressure from hydraulic system 4 (AMM 29-11-00/201).

 S 034-045

 (8)  
Do these steps to remove the hydraulic fluid from the hydraulic brake accumulator:

 (a)  
Look at the pressure indication of the HYD BRAKE PRESS gage on the Captain's Main Instrument Panel, P1.

 S 844-054
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 32-41-14
 ALL  ú ú 01 Page 404 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  Slowly push one set of brake pedals to the limit of travel, hold momentarily, and then release. Repeat this cycle 10 times. 1) Make sure the pressure indication of the HYD BRAKE PRESS
 gage decreases during manual brake operation. 2) Aftr 10 cycles of manual brake operation, make sure the HYD BRAKE PRESS gage shows no more decrease in pressure.
 E. Procedure
 S 034-056
 (1)  
Disconnect the electrical connector, DS1886, from the pressure switch.

 S 034-058

 (2)  
Remove the lockwire that safeties the pressure switch to the manifold.

 S 024-043

 (3)  
Turn the pressure switch counterclockwise at the lands at its base, to remove it from the manifold.

 S 914-060

 (4)  
Install a plug in the open port on the manifold.

 S 034-062

 (5)
Remove the O-rings from the pressure switch and discard them.

 TASK 32-41-14-404-008
 4. Alternate Brake Hydraulic System Pressure Switch - Installation (Fig. 401)
_______________________________________________________________
 A. General
 (1)  
In subsequent steps, the alternate brake hydraulic system pressure switch is referred to as the pressure switch.

 B.
Consumable Materials

 (1)  
D00288 Lubricant - MCS 352

 NOTE: Use BMS 3-11 or MCS 352 to lubricate
____ O-rings and fittings on the accumulator assembly.
 (2)  D00196 Hydraulic Fluid - BMS 3-11
 NOTE: Use BMS 3-11 or MCS 352 to lubricate
____ O-rings and fittings on the accumulator assembly.
 C. References
 (1)  
AMM 12-12-01/301, Hydraulic Systems (Hydraulic Replenishing)

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (4)  
AMM 31-61-00/001, Integrated Display System

 (5)  
AMM 32-00-30/201, Landing Gear Door Locks

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