32-44-10
 ALL  ú ú 01 Page 402 ú Feb 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 494-021
 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.
 (3)  
Do this task: "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).

 S 494-022

 (4)  
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).

 S 864-004

 (5)  
Open this circuit breaker and attach a DO-NOT-CLOSE tag:

 (a)  
P6 Main Power Distribution Panel
 1) 6L18 PARK BRAKE

 S 864-005
 (6)  
Release the parking brake.

 S 864-006

 (7)  
Remove pressure from hydraulic systems 1 and 4 (AMM 29-11-00/201).

 D.  
Procedure

 S 024-007
 (1)  
Remove the pressure switch.

 (a)  
Disconnect the electrical plug: 1) Disconnect electrical plug DS130 from the left pressure switch.

 2)  Disconnect electrical plug DS129 from the right pressure switch.

 (b)  
Seal the plug and the receptacle with a cap.

 (c)  
Remove the pressure switch from the manifold.

 (d)  
Discard the O-rings and the backup rings.

 (e)  
Seal the port with a cap.

 TASK 32-44-10-404-008
 3.  Installation of the Pressure Switch for the Parking Brake (Fig. 401)_________________________________________________________
 A.  Consumable Materials
 (1)  
D00196 Fluid - Hydraulic, BMS 3-11, Type IV, CL1

 B.  
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (3)  
AMM 32-00-30/201, Landing Gear Door Locks

 (4)  
IPC 32-41-14 Fig. 2

 (5)  
WDM 32-44-11

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 32-44-10
 ALL  ú ú 02 Page 403 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 C.  Access
 (1)  
Location Zone
 135 Wing Landing Gear Wheel Well, LH
 136 Wing Landing Gear Wheel Well, RH

 D.  
Procedure

 S 644-023
 (1)
Lubricate a new O-ring and new backup rings with hydraulic fluid.

 S 434-009

 (2)
Install the new O-ring and the backup rings on the pressure switch.

 S 424-026

 (3)  
Install the pressure switch.

 (a)  
Install the pressure switch to the manifold.

 (b)  
Connect the electrical plug: 1) Connect electrical plug DS130 to the left pressure switch.. 2) Connect electrical plug DS129 to the right pressure switch.

 S 864-027
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (4)  
Pressurize hydraulic system 4 (AMM 29-11-00/201).

 S 794-013

 (5)  
Do a check of the pressure switch for leaks.

 S 864-014

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

 S 724-015

 (7)  
Do a test for the operation of the pressure switch.

 (a)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 1)  P6 Main Power Distribution Panel a) 6L18 PARK BRAKE

 (b)  
Set the parking brake.

 (c)  
Make sure that the red BRAKE ON indicator light on the P37 panel comes on.

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