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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 (2)  S 094-085Do this task: "Removal of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).
 (3)  S 844-086Remove electrical power, if it is not necessary (AMM 24-22-00/201).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 LANDING GEAR BRAKE UNIT - INSPECTION/CHECK
__________________________________________
 1.  General_______
 A.  This procedure has instructions to do these tasks:
 (1)  
Examine the Brakes for Wear

 (2)  
Examine the Brake Unit

 B.  
This procedure examines the brake unit for leaks, correct movement of the pressure plate, and worn brake pads. You can do some of the steps with the wheel installed and some with the wheel removed. With the brake removed, you can do a dimension inspection of the brake unit and other brake components.

 TASK 32-41-15-206-042
 2.  Examine the Brakes for Wear____________________________
 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)  
AMM 32-41-15/401, Landing Gear Brake Unit

 B.  
Access

 (1)  
Location Zones
 755 Body Landing Gear - Left
 765 Body Landing Gear - Right
 735 Wing Landing Gear - Left
 745 Wing Landing Gear - Right

 C.  
Prepare for the Inspection

 S 496-057
 (1)
Make sure you install the chocks at all the wheel locations.

 S 496-058

 (2)  
Make sure you installed the landing gear ground locks (AMM 09-11-00/201).

 S 496-045
 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 496-046

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

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A
747-400 MAINTENANCE MANUAL
 S 866-047
 (5)
Supply pressure to hydraulic system No. 4 (AMM 29-11-00/201).

 S 866-048

 (6)  
Make sure the parking brake is set.

 D.
Examine the Brakes for Wear

 S 216-049
 (1)  Examine the wear indicator pin (Fig. 601, dimension "L").
 NOTE: Each brake has two brake wear indicator pins.
____
 (a)  
If the two wear pins are missing, you must replace the brake prior to the next flight.

 (b)  
If one wear pin is missing, the brake can stay in service if the remaining wear pin operation is satisfactory.

 S 906-050
 (2)  
If the end of the wear pin aligns with the bracket (L=0), replace the brake (AMM 32-41-15/401).

 E.
Put the Airplane Back to Its Usual Condition

 S 496-053
　
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