(6)  
Release the hydraulic fluid from the hydraulic pressure surge accumulator.

 (a)  
Look at the pressure on the HYD BRAKE PRESS gage on the captain's instrument panel.

 (b)  
Push in on the brake pedals fully 10 times.

 (c)  
Make sure the pressure does not decrease the last time you operate the brake pedals.

 S 684-008
 (7)
Release the gas from the hydraulic pressure surge accumulator.

 (a)  
Remove the dust cap from the charging valve.

 WARNING:_______DO NOT LOOSEN THE BODY OF THE VALVE. THE PRESSURE IN THE HYDRAULIC PRESSURE SURGE ACCUMULATOR CAN QUICKLY PUSH THE VALVE OFF THE MANIFOLD. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (b)  Loosen the swivel hexagonal nut on the charging valve a maximum of one turn.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 (c)  
Look at the pressure gage for the hydraulic pressure surge accumulator.

 (d)  
Make sure the pressure gage shows zero pressure.

 (e)  
Install the dust cap.

 D.
Remove the Pressure Gage

 S 024-009
 (1)  
Remove the pressure gage.

 (a)  
Loosen the tubing nuts on the tube between the manifold and the pressure gage.

 (b)  
Disconnect the tube from the pressure gage.

 (c)  
Put a cap on the pressure gage fitting and the tube fitting.

 (d)  
Remove the four nuts that attach the pressure gage to the mounting bracket.

 (e)  
Remove the pressure gage from the mounting bracket.

 (f)  
Remove the screws, washers, shield, and spacers from the pressure gage.

 TASK 32-41-24-404-010
 3.  Hydraulic Pressure Surge Accumulator Pressure Gage Installation (Fig. 401)_______________________________________________________________
 A. Consumable Materials
 (1)  
D00288 MCS 352 Lubricant

 B.
References

 (1)  
AMM 09-11-00/201, Towing

 (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 Door Locks

 (5)  
AIPC 32-41-10 Fig. 3

 (6)  
AIPC 32-41-32 Fig. 1

 C.
Access

 (1)  
Location Zone 138 Body Landing Gear Well - Right 571 Rear Spar to Landing Gear Support Beam, Left 671 Rear Spar to Landing Gear Support Beam, Right

 D.
Prepare for the Installation

 S 494-011
 (1)  Make sure that the landing gear ground locks are installed (AMM 09-11-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 494-019
 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.
 (2)  
Install the door locks on the doors for the wing and the body landing gears (AMM 32-00-30/201).

 E.
Install the Pressure Gage

 S 424-012
 (1)  
Install the pressure gage:

 (a)  
Install the screws, washers, shield, and spacers on the pressure gage.

 (b)  
Install the pressure gage on the mounting bracket.

 (c)  
Install four nuts to attach the pressure gage to the mounting bracket.

 (d)  
Lubricate the threads on the pressure gage fitting.

 (e)  
Connect the tube to the pressure gage.

 (f)  
Tighten the tubing nuts at the pressure gage and the manifold.
　
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