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A
747-400 MAINTENANCE MANUAL
 S 094-025
 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.
 (8)  
Do this task: "Removal of the Door Locks from the Wing Landing Gear" (AMM 32-00-30/201).

 S 094-024

 (9)  
Do this task: "Removal of the Door Locks from the Body Landing Gear" (AMM 32-00-30/201).

 S 864-018

 (10)
 Remove hydraulic power if it is not necessary (AMM 29-11-00/201).

 S 864-019

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

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

 (2)  
The installation of the parking brake switch.

 B.  
The switch, S313, is installed under the upper deck floor in the forward passenger cabin forward of door No. 1.

 TASK 32-44-11-004-065
 2.  Remove the Parking Brake Switch (Fig. 401)_______________________________
 A.  References
 (1)  
AMM 25-22-01/401, Main Passenger Cabin Ceiling Panels

 B.  
Access

 (1)  
Location Zones 211 Passenger Cabin - Nose to First Door, L.H. 221 Control Cabin - L.H.

 C.  
Prepare to Remove the Switch

 S 494-055
 (1)  
Make sure the chocks are installed at all wheels.

 S 864-056

 (2)  
Release the parking brake.

 S 864-032

 (3)  
Open this circuit breaker and attach a DO-NOT-CLOSE tag:

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

 S 014-057
 (4)  
Remove the fourth middle and left ceiling panels in the passenger compartment forward of door No. 1 (AMM 25-22-01/401).

 D.  
Remove the Switch

 (1)  
Disconnect the electrical wires from the switch.

 S 034-058

 (2)  
Remove the screws, washers and nuts that hold the switch and spacer to the structure.

 (3)  
Remove the switch and spacer.

 S 034-000
 S 024-059
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A
747-400 MAINTENANCE MANUAL
BRAKE PEDALS
SEE A
UPPER DECK FLOOR
NO. 1 ENTRY DOOR
CAPTAIN'S BRAKE PEDALS
BRAKE PEDALS
PARKING BRAKE PAWL
A
STRUCTURE (REF)
SWITCH ACTUATOR SCREW
A
(2 LOCATIONS)
SWITCH
FWD
A PARKING BRAKE SWITCH, S313
SPACER
B
A-A
Installation of the Switch for the Parking Brake Figure 401
PARKING BRAKE SWITCH, S313
SEE B
PARKING BRAKE PAWL
SWITCH ACTUATOR
NUT WASHER
(2 LOCATIONS)
SWITCH
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