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Charging valve
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Pressure transducer
*
Pressure indicator (flight deck)
*
Pressure indicator (wheel well).
Location
The brake accumulator and servicing components are on the keel beam in the right main wheel well.
The brake accumulator pressure indicator is on the brake accumulator pressure indicator panel on the P1 left forward panel below the brake source light.
EFFECTIVITY BEJ ALL
Physical Description
The accumulator is a gas charged unit with a floating piston that separates the gas and the fluid sides. It has a precharge of 1000 psi and a volume of 600 cubic inches. The right hydraulic system pressurizes the accumulator.
The brake accumulator pressure transducer sends the pressure signal to the pressure indicator on the flight deck.
The pressure indicator in the main landing gear wheel well is used for inspection and servicing.
Charging instructions are on a placard by the charging valve and transducer.
Training Information Point
This is a summary of things you do to do a check of the accumulator precharge pressure:
*
Make sure the right and center hydraulic systems are off
*
Use the brake pedals to bleed hydraulic system pressure from the accumulator
*
Compare the accumulator indicator pressure to the pressure on the charging instructions graph.
Service the accumulator if necessary.
This warning has a relation to servicing the accumulator.
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Page 17 D633W101-BEJ Sep 05/2002
BRAKE HYDRO-MECHANICAL CONTROL -BRAKE ACCUMULATOR AND SERVICING COMPONENTS
WARNING: DO NOT LOOSEN THE BODY OF THE BRAKE ACCUMULATOR CHARGING VALVE. THE PRESSURE IN THE BRAKE ACCUMULATOR CAN QUICKLY PUSH THE CHARGING VALVE OFF THE MANIFOLD. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
This is a summary of the servicing procedure:
*
Connect the valve a pressure regulated source of dry nitrogen
*
Turn the outer swivel nut to open the valve
*
Pressurize the accumulator to the appropriate pressure shown on the graph
*
If a large pressure change was made, let the gas stabilize for five minutes and then measure the pressure again.
EFFECTIVITY BEJ ALL 32-41-00
Page 18
D633W101-BEJ Sep 05/2002
BRAKE HYDRO-MECHANICAL CONTROL -BRAKE ACCUMULATOR AND SERVICING COMPONENTS
EFFECTIVITY BEJ ALL 32-41-00
Page 19
D633W101-BEJ Jan 05/2002
BRAKE HYDRO-MECHANICAL CONTROL -ANTISKID SURGE ACCUMULATOR AND SERVICING COMPONENTS
Purpose
The anti-skid surge accumulator absorbs brake release surges from the left normal anti-skid valve module.
Components
The anti-skid surge accumulator and servicing components include:
*
Antiskid surge accumulator
*
Charging valve
*
Pressure gage assembly.
Location
The antiskid surge accumulator and servicing components are on the left main landing beam. They are outboard and aft of the left normal antiskid valve module.
You open an access panel outboard of the left MLG to access the antiskid surge accumulator.
Physical Description
The accumulator is a gas charged unit with a floating piston that separates the gas and the fluid sides. It has a precharge of 150 psi and a volume of 25 cubic inches.
Charging instructions are on a placard by the charging valve and gage.
Training Information Point
The right normal antiskid valve module does not need an antiskid surge accumulator because the right hydraulic system reservoir is very near to the right normal antiskid valve module.
EFFECTIVITY BEJ ALL 32-41-00
Page 20
D633W101-BEJ Sep 05/2002
BRAKE HYDRO-MECHANICAL CONTROL -ANTISKID SURGE ACCUMULATOR AND SERVICING COMPONENTS
EFFECTIVITY BEJ ALL 32-41-00
Page 21
D633W101-BEJ Jan 05/2002
BRAKE HYDRO-MECHANICAL CONTROL -ALTERNATE SOURCE SELECTOR AND ACCUMULATOR ISOLATION VALVES
Purpose
These two hydro-mechanical valves select and send pressure to the normal or the alternate brake hydraulic systems:
*
Brake alternate source selector valve (ASSV)
*
Brake accumulator isolation valve (AIV).
Location
The ASSV is on the keel beam in the left main landing gear wheel well.
The AIV is on the keel beam below the brake accumulator in the right main landing gear wheel well.
Physical Description
Both valves are the same and are interchangeable.
Each valve gets pressure from two sources. The pressures push on pistons in the valves that have different areas. This moves the valves to select the brake source.
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