(2)  
Make sure the wheel chocks are installed.

 (3)  
If necessary, release the parking brake.

 S 864-035
 S 864-036
 S 494-029
 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.
 (4)  Do this task: "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

HYDRAULIC LINE HYDRAULIC BRAKE ACCUMULATOR INSTALLATION
SEE A
UNION DIRECT READING O-RING
PRESSURE GAGE
GAS CHARGING VALVE
HYDRAULIC FWD
BRAKE ACCUMULATOR WHEEL WELL FOR THE RIGHT BODY GEAR
PLACARD
ACCUMULATOR
CLAMP
O-RING
UNION
TUBING TO DIRECT READING PRESSURE GAGE AND GAS CHARGING VALVE
HYDRAULIC BRAKE ACCUMULATOR INSTALLATION
A
Hydraulic Brake Accumulator Installation Figure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 (5)  S 494-030Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).
 (6)  S 864-006Remove the pressure from hydraulic systems 1, 2, and 4 (AMM 29-11-00/201).
 (7)  S 864-007Do these steps to remove the hydraulic fluid from the accumulator: (a) Look at the pressure indication of the HYD BRAKE PRESS gage on the Captain's Main Instrument Panel, P1. (b) Slowly push one set of brake pedals to the limit of travel, hold momentarily, and then release. Repeat this cycle 10 times. 1) Make sure the pressure indication of the HYD BRAKE PRESS gage decreases during manual brake operation. 2) After 10 cycles of manual brake operation, make sure the HYD BRAKE PRESS gage shows no more decrease in pressure.
 (8)  S 844-008Do these steps to release the gas from the hydraulic brake accumulator: (a) Remove the cap from the gas charging valve for the accumulator.
 WARNING:_______ DO NOT LOOSEN THE BODY OF THE GAS CHARGING VALVE. THE PRESSURE IN THE ACCUMULATOR CAN QUICKLY PUSH THE GAS CHARGING VALVE OFF THE MANIFOLD. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (b) (c)  Turn the outer nut of the gas charging valve one turn counterclockwise to release the gas pressure from the accumulator.Make sure the pressure indication of the direct reading pressure gage goes to zero.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 E. Procedure
 S 034-037
 (1)  
Disconnect the hydraulic line from the higher end of the accumulator.

 S 034-038

 (2)  
Put a cap on the line and the hydraulic port.

 S 034-039

 (3)
Disconnect the tubing on the lower end of the accumulator.

 S 024-009

 (4)  
Remove the hydraulic brake accumulator.

 (a)  
Loosen the clamps that attach the accumulator to the keel beam.

 (b)  
Remove the accumulator from the airplane.

 S 034-040
 (5)  
Remove the unions from the higher side and the lower side of the accumulator.

 S 034-041

 (6)  
Discard the O-rings.

 TASK 32-41-09-404-010
 3. Hydraulic Brake Accumulator Installation (Fig. 401)
________________________________________
 A. General
 (1)  
　
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