(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)  
The Integrated Display System (IDS) is serviceable (AMM 31-61-00/501).

 NOTE: The EIU, EICAS, and CMC must be serviceable.
____
 E. Prepare for the Test
 S 495-087
 (1)  
Make sure that the ground lockpins for the landing gear are
 installed (AMM 09-11-00/201).

 S 495-088

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

 S 865-089

 (3)  
Release the parking brake.

 S 495-090
 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 865-040

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

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

 S 025-093
 NOTE: Put the bleed plug in a clean bag and keep them for
____
 installation when you complete the test.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 425-094
 CAUTION: DO NOT TIGHTEN THE BRAKE PRESSURE GAGE TO MORE THAN 110
_______ POUND-INCHES. IF THE BRAKE PRESSURE GAGE IS TIGHTENED TO MORE THAN 110 POUND-INCHES, DAMAGE TO THE BRAKE CAN OCCUR.
 (7)  
Install a pressure gage on a brake.

 S 615-011

 (8)  
Make sure the brake hydraulic accumulator has the correct precharge pressure (AMM 12-15-09/301).

 S 615-012

 (9)  
Make sure the hydraulic pressure surge accumulators have the correct precharge pressure (AMM 12-15-11/301).

 F.  
Parking Brake System Test (Fig. 502)

 S 865-016
 (1)  
Pressurize hydraulic system 4 (AMM 29-11-00/201).

 (a)  
Make sure the pressure indication for hydraulic system 4 on EICAS shows 2900-3150 psi.

 (b)  
Make sure that the HYD BRAKE PRESS gage on the P1-4 panel shows 2900-3150 psi.

 S 715-017
 (2)  
Do a test on the parking brake operation:

 (a)  
Push on the captain's left brake pedal and pull the parking brake lever on the control stand. 1) Make sure the parking brake will not engage. 2) Make sure all three indicator lights on the nose gear are

 off.

 (b)  
Push on the captain's right brake pedal and pull the parking brake lever on the control stand. 1) Make sure the parking brake will not engage. 2) Make sure all three indicator lights on the nose gear are

 off.

 (c)  
Push on the first officer's left pedal and pull the parking brake lever. 1) Make sure the parking brake will not engage.

 (d)  
Push on the first officer's right pedal, and pull the parking brake lever. 1) Make sure the parking brake will not engage.

 (e)  
Push on the captain's left and right pedals, and pull the parking brake lever. 1) Make sure the parking brake engages. 2) Make sure the EICAS message PARKING BRAKE SET shows on

 EICAS.
 3)  Make sure the pressure gage on the brake and the HYD BRAKE PRESS gage on the P1 panel show the same pressure (|100 psi).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
EICAS
SEE A
SEE C
PARKING BRAKE
SET LIGHT (L1539)

BRAKEPARKING
ON BRAKE SET
REMOTE BRAKE INDICATOR LIGHT (L1541)
　
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