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747-400 MAINTENANCE MANUAL
 (5)  S 214-022Look for leaks at the hydraulic fittings of the relief valve.
 (6)  S 864-059Supply electrical power (AMM 24-22-00/201)
 (7)  S 864-023Remove the DO-NOT-CLOSE tag and close this circuit breaker: (a) P6 Main Power Distribution Panel 1) 6L18 PARK BRAKE
 (8)  S 724-025Do the steps that follow to do a test of the operation of the parking brake system: (a) Set the parking brake. (b) Make sure the EICAS message PARKING BRAKE SET shows on the EICAS display. (c) Release the parking brake. (d) Make sure the EICAS message PARKING BRAKE SET does not show on the EICAS display.
 (9)  S 864-026Set the parking brake.
 S 864-027

 (10)
 Remove hydraulic pressure (AMM 29-11-00/201).

 S 864-028

 (11)
 Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 094-036
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ DOOR LOCKS FROM THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (12)
 Do this task:  "Removal of the Door Locks from the Wing Landing Gear" (AMM 32-00-30/201).

 S 094-037

 (13)
 Do this task:  "Removal of the Door Locks from the Body Landing Gear" (AMM 32-00-30/201).

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747-400 MAINTENANCE MANUAL
 PARKING BRAKE PRESSURE SWITCH - REMOVAL/INSTALLATION
____________________________________________________
 1.  General
_______
 A.  This procedure contains two tasks:
 (1)  
The removal of the pressure switch for the parking brake (referred to as the pressure switch)

 (2)  
The installation of the pressure switch.

 B.  
Pressure switch S130 is installed in the wheel well for the left wing landing gear. Pressure switch S129 is installed in the wheel well for the right wing landing gear.

 TASK 32-44-10-004-001
 2.  Removal of the Pressure Switch for the Parking Brake (Fig. 401)
____________________________________________________
 A.  References
 (1)  
AMM 09-11-00/201, Towing

 (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

 B.  
Access

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

 C.  
Prepare for the procedure

 (1)  
Install chocks at all wheels.

 S 494-016
 S 494-020
 WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  Install the ground locks in all landing gear (AMM 09-11-00/201).
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MAINTENANCE MANUAL

SEE A
WHEEL WELL CEILING 
SWITCH PRESSURE 
LINE HYDRAULIC 
MANIFOLD  INBD 
A  FWD 
____NOTE:  INSTALLATION IS ALMOST THE SAME. INSTALLATION. THE RIGHT PRESSURE SWITCH THIS VIEW SHOWS THE LEFT PRESSURE SWITCH 
Parking Brake Pressure Switch Installation Figure 401 

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