B.
Standard Tools and Equipment

 (1)  
Gage, Hydraulic Pressure, 0-4000 psi with a
 0.5625 (inch)-18 UNF male thread adapter
 (Aeroquip P/N 2266-6-8S) (Quantity two)

 -Commercially Available
 NOTE: The adapter permits installation of the
____ pressure gage directly in the bleeder assembly port of the brake unit housing.
 C. Consumable Materials
 (1)  
D00153 Hydraulic Fluid - BMS 3-11

 D.
References

 (1)  
AMM 09-11-00/201, Towing

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (4)  
AMM 34-21-00/201, Inertial Reference System

 E.
Access

 (1)  
Location Zones
 221 Control Cabin, LH
 222 Control Cabin, RH
 730 Wing Landing Gear - Left and Doors
 740 Wing Landing Gear - Right and Doors
 750 Body Landing Gear - Left and Doors
 760 Body Landing Gear - Right and Doors

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747-400 MAINTENANCE MANUAL
 F. Preconditions
 S 865-411
 (1)  
These conditions are necessary for this task:

 (a)  
Electrical power is available (AMM 24-22-00/201).

 (b)  
The hydraulic systems are servicable (AMM 29-11-00/201).

 (c)  
The Inertial Reference System is serviceable
 (AMM 32-21-00/201).

 G.
Prepare for the Test

 S 845-242
 (1)  
Make sure that the landing gear ground locks are installed
 (AMM 09-11-00/201).

 S 845-244

 (2)  
Make sure that the wheel chocks are installed.

 S 845-327

 (3)  
Supply electrical power (AMM 24-22-00/201).

 S 845-328

 (4)  
Release the parking brake.

 S 485-329

 (5)  
Install a pressure gage at a brake unit on each side of the airplane (2 locations):

 (a)  
Make sure that the parking brake is released.

 (b)  
Make sure that the brakes are not operated manually.

 WARNING: THE BRAKES MUST NOT BE IN OPERATION WHEN YOU CONNECT OR
_______ DISCONNECT THE TWO PARTS OF A HYDRAULIC BRAKE DISCONNECT. IF YOU TRY TO CONNECT OR DISCONNECT A HYDRAULIC BRAKE DISCONNECT WITH THE BRAKE IN OPERATION, HYDRAULIC FLUID UNDER HIGH PRESSURE CAN RELEASE. THIS CAN CAUSE INJURY TO PERSONNEL AND DAMAGE TO EQUIPMENT.
 (c)  
To remove all pressure from the brake unit, disconnect the hose half of the hydraulic brake disconnect from the brake half.

 (d)  
Remove the brake bleeder assembly from the brake unit housing.

 NOTE: Each brake bleeder assembly has a bleeder valve
____ installed in an adapter. The adapter is installed in the brake unit housing.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

 CAUTION:_______ BE CAREFUL DURING INSTALLATION OF THE PRESSURE GAGE IN THE
 PORT ON THE BRAKE UNIT HOUSING.  DO NOT INSTALL THE
 PRESSURE GAGE WITH MORE THAN 110 POUND-INCHES OF TORQUE.
 IF YOU USE TOO MUCH TORQUE DURING INSTALLATION OF A

 PRESSURE GAGE, YOU CAN DAMAGE THE BRAKE UNIT HOUSING.
 (e)  
Install a pressure gage in the port on the brake unit housing.

 (f)  
Connect the hose half of the hydraulic brake disconnect to the brake half.

 S 845-330
 (6)  
Make sure that all the thrust levers are set to the aft stop.

 S 845-331

 (7)  
Make sure that all three inertial reference systems are aligned (AMM 34-21-00/201).

 S 845-332
 WARNING: MAKE SURE THAT PERSONS ARE EQUIPMENT ARE CLEAR OF ALL
　
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