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module:
CAUTION: DO NOT LET DIRT OR CONTAMINANTS GO INTO
THE PORT OF THE FILTER. MALFUNCTION CAN
OCCUR.
CAUTION: WHEN YOU REMOVE THE SOLENOID VALVE
FROM THE MODULE, MAKE SURE THE VALVE IS
KEPT IN A VERTICAL POSITION. IF THE VALVE IS
NOT KEPT IN A VERTICAL POSITION, DAMAGE TO
THE CONNECTOR PINS CAN OCCUR.
CAUTION: WHEN YOU REMOVE THE SOLENOID VALVE AND
THE SEAL PLATE, MAKE SURE NO
CONTAMINANTS GO INTO THE OPEN PORTS ON
THE MODULE. DAMAGE TO THE VALVE CAN
OCCUR IF CONTAMINANTS GO INTO THE PORTS.
ANTISKID/AUTOBRAKE SYSTEM - AUTOBRAKE PRESSURE CONTROL MODULE
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ANTISKID/AUTOBRAKE SYSTEM - AUTOBRAKE PRESSURE CONTROL MODULE
ANTISKID/AUTOBRAKE SYSTEM - AUTOBRAKE PRESSURE CONTROL MODULE
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General
The autobrake pressure control module has these components:
* Solenoid valve
* Solenoid valve pressure switch
* Control valve
* Control valve pressure switch.
Solenoid Valve
The solenoid valve is a two-stage valve. The first stage is a
solenoid-operated valve. It controls pressure to the second
stage valve. The second stage is a pressure-operated valve. It
controls pressure to the control valve. The antiskid/autobrake
control unit (AACU) sends signals to the solenoid valve.
The AACU uses a solenoid valve pressure switch to monitor the
pressure from the solenoid valve for faults. The solenoid valve
pressure switch also sends brake pressure signals less than
750 psi to the flight data aquisition unit for recording purposes.
See the flight data recording system (FDRS) section for more
information about the FDAU. (SECTION 31-31)
Control Valve
The control valve is also a two stage valve. The first stage is a
variable electro-hydraulic control valve. It sends control
pressure to operate the second stage valve. The second
stage valve is a metering valve that is almost the same as the
brake metering valves. The second stage valve sends
autobrake pressure to the normal brake system in proportion
to the signal from the AACU. The signal from the AACU
operates the first stage of the control valve.
The AACU uses the control valve pressure switch to monitor the
pressure from the control valve for faults. The pressure switch
opens when control pressure from the control valve is less than
1000 psi.
Functional Description
When you move the AUTO BRAKE select switch to the 1, 2, 3,
MAX, or RTO positions, it sends the selected position to the
AACU.
The AACU sends signals to the first stage of the solenoid valve
and the first stage of the control valve to apply the autobrakes.
Pressure then goes to operate the second stage of both valves.
This sends autobrake pressure to the brakes.
The solenoid and control valve pressure switches monitor the
valves for correct operation. The AACU disarms the autobrakes
if one of the valves has a fault.
ANTISKID/AUTOBRAKE SYSTEM - AUTOBRAKE PRESSURE CONTROL MODULE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-42-00-104
ANTISKID/AUTOBRAKE SYSTEM - AUTOBRAKE PRESSURE CONTROL MODULE - FUNCTIONAL DESCRIPTION
ANTISKID/AUTOBRAKE SYSTEM - AUTOBRAKE PRESSURE CONTROL MODULE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-42-00-104
Purpose
Two autobrake shuttle valves select the highest of autobrake or
normal metered pressures and send it to the brakes.
Location
The autobrake shuttle valves are on the aft bulkhead of the main
landing gear wheel well.
Physical Description
The valves are un-biased shuttle valves with detents. The
valves are interchangeable.
Functional Description
The metered pressure switch sends signals to the antiskid/
autobrake control unit when the pressure from the normal brake
metering valve increases to more than 750 psi. The antiskid/
autobrake control unit uses this signal to disarm the operation
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