(b)  
Make sure that these pressure indications are the same (|100 psi): 1) The indication of the HYD BRAKE PRESSURE gage on the

 Captain's Main Instrument Panel, P1. 2) The indication for hydraulic system 4 on the EICAS hydraulic synoptic display (AMM 31-61-00/001).

 (c)  
Make sure that these pressure indications are the same (|100 psi): 1) The indication of the direct reading pressure gage adjacent

 to the hydraulic brake accumulator 2) The indication of the HYD BRAKE PRESS gage, on the P1 panel.
 S 866-007
 (3)  
Remove the power from hydraulic system 4 (AMM 29-11-00/201).

 S 786-008

 (4)  
Make sure the pressure indication of the HYD BRAKE PRESS gage, on the P1 panel, does not decrease.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 E. Put the Airplane Back to Its Usual Condition
 S 496-020
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ DOOR LOCKS FROM THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  
Do this task: "Removal of the Door Locks from the Wing Landing Gear" (AMM 32-00-30/201).

 S 496-021

 (2)  
Do this task: "Removal of the Door Locks from the Body Landing Gear" (AMM 32-00-30/201).

 (3)
Remove electrical power, if it is not necessary (AMM 24-22-00/201).

 S 846-025
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 HYDRAULIC BRAKE ACCUMULATOR GAS CHARGING VALVE - REMOVAL/INSTALLATION
_____________________________________________________________________
 1.  General_______
 A.  This procedure contains two tasks:
 (1)  
The removal of the hydraulic brake accumulator gas charging valve

 (2)  
The installation of the hydraulic brake accumulator gas charging valve.

 B.  
In subsequent steps, the hydraulic brake accumulator gas charging valve is referred to as the gas charging valve.

 C.  
The gas charging valve is part of the manifold assembly. The manifold assembly is part of the hydraulic brake acumulator charging equipment installation.

 D.  
The manifold assembly is installed on the center web of the keel beam in the wheel well for the right body gear.

 TASK 32-41-10-004-001
 2.  Hydraulic Brake Accumulator Gas Charging Valve Removal (Fig. 401)______________________________________________________
 A.  General
 (1)  
In subsequent steps, the hydraulic brake accumulator gas charging valve is referred to as the gas charging valve.

 B.  
References

 (1)  
AMM 09-11-00/201, Towing

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

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

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

 (5)  
AIPC 32-41-11 Fig. 1

 C.  
Access

 (1)  
Location Zone
 138 Body Landing Gear Well - Right

 D.  
Prepare for the Removal

 S 844-042
 (1)  
Make sure the landing gear ground locks are installed (AMM 09-11-00/201).

 (2)  
Make sure the wheel chocks are installed.

 (3)  
If necessary, release the parking brake.

 S 844-003
 S 844-004
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