32-41-00
 ALL  ú ú 02 Page 515 ú Oct 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (2)  
AMM 20-11-02/401, Cable Turnbuckle Locking Clips

 (3)  
AMM 25-22-01/401, Main Passanger Cabin Ceiling Panels

 (4)  
AMM 27-21-06/401, Rudder Forward Quadrant - Removal/Installation

 (5)  
AIPC 32-41-02, Fig. 1

 (6)  
AIPC 32-41-05, Fig. 1

 (7)  
AIPC 32-41-34, Fig. 1

 D.
Access

 (1)  
Location Zones
 135 Wing Landing Gear Well - Left
 (Left Brake Metering Valve)
 136 Wing Landing Gear Well - Right
 (Right Brake Metering Valve Installation)
 211 Passenger Cabin Nose to First Door (left hand)
 (Left Brake Pedal Bus Installation)

 212  Passenger Cabin Nose to First Door (right hand) (Right Brake Pedal Bus Installation)
 E. Preconditions
 S 865-181
 (1)  
This condition is necessary for this task:

 (a)  
The internal and external temperatures must be stable for one hour.

 F.
Prepare to Adjust the Brake System

 NOTE:  Installation of rudder pedal arm rig pins R-1 (Captain's assembly)
____ or R-2 (First Officer's assembly) for this procedure can prevent inadvertent rudder pedal inputs and make the adjustment easier.
 S 495-064
 (1)  Make sure the ground locks are installed in all landing gear (AMM 09-11-00/201).
 S 495-008
 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.
 (2)  
Do this task: "Install the Door Locks for all the landing gear" (AMM 32-00-30/201).

 (3)  
Make sure that wheel chocks are installed at all wheels.

 S 495-010
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 845-065
 (4)  
Release the parking brake.

 S 015-035

 (5)  
Remove the outboard ceiling panels (approximately 8 feet 6 inches aft of the number 1 entry door) for access to the brake cable turnbuckles (AMM 25-22-01/401).

 NOTE: For access to other turnbuckles, remove the outboard
____ ceiling panels adjacent to the number three entry door. The turnbuckles are in the ceiling area at the locations specified below.
 ~........................................................... | BRAKE CABLE | TURNBUCKLE LOCATION | 2........................…..................................1 ~........................................................... | Forward Turnbuckles | ~........................................................... | LGB1A LH side | STA 586.45 | | LGB1B LH side | STA 611.57 | ............................................................. | LGB2A RH side | STA 586.45 | | LGB2B RH side | STA 611.57 | 2........................…..................................1 ~........................................................... | Aft Turnbuckles | ~........................................................... | LGB1A LH Side | STA 1295.88 | | LGB1B LH Side | STA 1308.56 | ............................................................. | LGB2A RH Side | STA 1295.88 | | LGB2B RH Side | STA 1308.56 | 2........................…..................................1
 G. Adjust the Brake System (Fig. 501)
 S 845-175
 (1)  
If you have installed new cables, do the steps that follow to prestretch the cables before you do the subsquent adjustments:

 (a)  
Install the rig pins No. 3 and No. 4 of the left and right brake metering valve control quadrant.

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