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A
747-400 MAINTENANCE MANUAL
 2)  After ten cycles of the manual brake operation, make sure the HYD BRAKE PRESS gage does not continue to decrease in pressure.
 S 684-008
 (9)
Do these steps to release the gas from the surge accumulator:

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

 WARNING:_______DO NOT LOOSEN THE VALVE BODY. IF YOU LOOSEN THE VALVE BODY, THE VALVE CAN BE BLOWN OFF. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.

 (b)  
Loosen the swivel hexagonal nut on the air charging valve a maximum of one turn.

 (c)  
Look at the pressure gage installed near the surge accumulator.

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

 E.  
Procedure

 S 024-010
 (1)  
Do these steps to remove the air charging valve:

 (a)  
Turn the valve counterclockwise to loosen it.

 (b)  
Remove the valve from the manifold.

 (c)  
Remove the O-ring and discard it.

 TASK 32-41-23-404-011
 3.  Hydraulic Pressure Surge Accumulator Air Charging Valve - Installation______________________________________________________________________ (Fig. 401)
 A.  General
 (1)  
In subsequent steps the hydraulic pressure surge accumulator air charging valve is referred to as the air charging valve.

 (2)  
In subsequent steps the hydraulic pressure surge accumulator is referred to as the surge accumulator.

 B.  
Consumable Materials

 (1)  
D00288 Lubricant - MCS 352

 C.  
References

 (1)  
AMM 09-11-00/201, Towing

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

 (3)  
AMM 24-22-00/201, Manual Control

 (4)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (5)  
AMM 32-00-30/201, Landing Gear Door Locks

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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MAINTENANCE MANUAL

HYRDRAULIC PRESSURE SURGE ACCUMULATORHYDRAULIC PRESSURE SURGE ACCUMULATOR PLACARD
FOR THE WING
LANDING GEAR

SEE A
HYDRAULIC PRESSURE
SURGE ACCUMULATOR
FOR THE WING
LANDING GEAR

SEE A
INBD HYDRAULIC PRESSURE SURGE ACCUMULATOR FOR THE BODY LANDING GEAR
PRESSURE MANIFOLD
GAGE
SEE B

SEE C FWD
HYDRAULIC PRESSURE SURGE ACCUMULATOR
HYDRAULIC PRESSURE  FOR THE WING LANDING GEAR
SURGE ACCUMULATOR
(LEFT SIDE SHOWN, RIGHT SIDE ALMOST THE SAME)
A
O-RINGCHARGING VALVE SWIVEL
MANIFOLD
NUT SEE C CAP
PLACARD
MANIFOLD
HYDRAULIC PRESSURE SURGE ACCUMULATOR FOR THE BODY LANDING GEAR C
B
Hydraulic Pressure Surge Accumulator Air Charging Valve Installation Figure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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MAINTENANCE MANUAL

 (6)  
AIPC 32-41-32 Fig. 1

 D.
Access

 (1)  
Location Zones 138 Body Landing Gear Well, RH (Body Gear Hydraulic Pressure Surge Accumulator) 571 Rear Spar to Landing Gear Support Beam, LH (Left Wing Gear Hydraulic Pressure Surge Accumulator)

 671  Rear Spar to Landing Gear Support Beam, RH (Right Wing Gear Hydraulic Pressure Surge Accumulator)
 E. Prepare for the Installation
 S 494-012
 (1)  Make sure the landing gear ground locks are installed
 (AMM 09-11-00/201).

 S 494-013
 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.
　
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