CAUTION: DO NOT TIGHTEN THE ADAPTER FITTING FOR THE BRAKE BLEEDER
_______ MORE THAN 90-110 POUND-INCHES. IF YOU TIGHTEN THE FITTING MORE THAN 110 POUND-INCHES, DAMAGE TO THE FITTING OR BRAKE ASSEMBLY CAN OCCUR.
 (a)  Tighten the adapter fitting for the brake bleeder to 90-110 pound-inches.
 NOTE: The specified torque values are for the installation of
____ the bleeder adapter fitting in the brake assembly. The maximum torque value for the brake bleeder valve (which you do not operate in this procedure) is 45 pound-inches.
 S 865-023
 (5)  
Pressurize hydraulic system 4 (AMM 29-11-00/201).

 S 865-041

 (6)  
Set the parking brake.

 S 095-011
 WARNING: REFER TO THE SPECIFIED PROCEDURE WHEN YOU REMOVE THE DOOR LOCKS
_______ FROM THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF THERE IS PRESSURE IN THE SYSTEM. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT.
 (7)  
Remove the door locks from the landing gear (AMM 32-00-30/201).

 S 865-042

 (8)  
Remove all hydraulic power if it is not necessary (AMM 29-11-00/201).

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A
747-400 MAINTENANCE MANUAL
 S 865-044
 (9)  Remove electrical power if it is not necessary (AMM 24-22-00/201).
 TASK 32-44-00-735-051
 4.  System Test - Parking Brake Hold Check______________________________________
 A. Standard Tools and Equipment
 (1)  
Pressure gage for use with BMS 3-11, Quantity 1, 0 to 4000 PSI pressure capacity

 B.
References

 (1)  
AMM 12-15-09/301, Brake Hydraulic Accumulator

 (2)  
AMM 12-15-11/301, Hydraulic Pressure Surge Accumulator

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

 (4)  
AMM 32-00-30/201, Landing Gear Ground Locks

 C.
Access

 (1)  
Location Zone
 221 Control Cabin, LH
 222 Control Cabin, RH
 735 Wing Landing Gear Left
 745 Wing Landing Gear Right
 755 Body Landing Gear Left
 765 Body Landing Gear Right

 D.
Preconditions

 S 865-052
 (1)  
These preconditions are necessary for this task:

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

 (b)  
Hydraulic systems are serviceable (AMM 29-11-00/201).

 (c)  
The brake hydraulic accumulators have the correct precharge pressure (AMM 12-15-09/301).

 (d)  
The surge accumulators have the correct precharge pressure (AMM 12-15-11/301).

 E.
Prepare for the Test

 S 495-053
 (1)  
Make sure that the ground lockpins for the landing gear are installed (AMM 09-11-00/201).

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

 (3)  
Release the parking brake.

 S 495-054
 S 865-055
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 ALL  ú ú 05 Page 518 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 495-056
 WARNING:_______ REFER TO THE SPECIFIED PROCEDURE TO INSTALL THE DOOR LOCKS
 CORRECTLY.  THE DOORS CAN CLOSE QUICKLY IF YOU INSTALL THE DOOR
 LOCKS INCORRECTLY.  THIS CAN CAUSE INJURIES TO PERSONS AND

 DAMAGE TO THE EQUIPMENT.
 (4)  
Install the door locks for each wing gear and body gear (AMM 32-00-30/201).

 S 865-057

 (5)  
Operate the brakes until the HYD BRAKE PRESS gage on the P1 Captain's Instrument Panel shows accumulator precharge pressure.

 S 025-092

 (6)  
Remove the bleed plug from one of the wheel brakes.
　
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