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The antiskid valves release brake pressure to prevent wheel
skids.
Four antiskid valves in the normal hydraulic brake system give
protection to each wheel during normal brake operation. Two
antiskid valves in the alternate hydraulic brake system each
give protection to both wheels on a main landing gear during
alternate brake operation.
Location
The antiskid valves for the normal brake system are on the aft
bulkhead of the main landing gear wheel well.
The antiskid valves for the alternate brake system are on the
outboard sides of the ceiling of the main landing gear wheel
well.
ANTISKID/AUTOBRAKE SYSTEM - ANTISKID VALVE
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-42-00-005
ANTISKID/AUTOBRAKE SYSTEM - ANTISKID VALVE
ANTISKID/AUTOBRAKE SYSTEM - ANTISKID VALVE
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-42-00-005
General
Four antiskid valves in the normal hydraulic brake system
control the brake pressure for each brake independently. Two
antiskid valves in the alternate hydraulic brake system each
control brake pressure for both brakes on one of the main
landing gear. All six antiskid valves are the same.
The antiskid valves have these two stages of control:
* The first stage valve controls pressure in proportion to input
current from the antiskid/autobrake control unit.
* The second stage keeps pressure to the brakes equal to the
first stage control pressure.
Filters
In-line screen filters remove contamination from the metered
pressure as it goes into the antiskid valve and as it goes out of
the valve and to the brake.
First Stage Valve
The first stage valve uses a current controlled flapper between
two nozzles to adjust the first stage pressure. One nozzle
connects to the metered pressure and the other connects to the
return.
When no current goes to the valve, the flapper moves against
the return nozzle. In this position, control pressure is the same
as metered pressure.
When full current goes to the valve, the flapper moves against
the pressure nozzle. In this position, control pressure is the
same as return pressure.
For each intermediate value of input current, the flapper moves
between the two nozzles to adjust the control pressure.
Second Stage Valve
The second stage valve uses a spool valve. It moves with first
stage control pressure and a spring on one end and brake
pressure on the other end.
When there is no brake pressure, the spring holds the spool in
position to send metered pressure to fill the brakes.
When control pressure is more than brake pressure, the spool
moves to send metered pressure to the brakes.
During antiskid operation, the spool operates to keep the brake
pressure equal to first stage control pressure. It sends
unwanted brake pressure to the system return.
Return Check Valve
If the return line has a blockage and return pressure is more
than brake pressure, the return check valve releases brake
pressure to metered pressure.
ANTISKID/AUTOBRAKE SYSTEM - ANTISKID VALVE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-42-00-006
ANTISKID/AUTOBRAKE SYSTEM - ANTISKID VALVE - FUNCTIONAL DESCRIPTION
ANTISKID/AUTOBRAKE SYSTEM - ANTISKID VALVE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 32-42-00
Page 19
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-42-00-006
Purpose
The autobrake pressure control module uses input from the
antiskid/autobrake control unit to meter hydraulic system B
pressure to the normal brake system during autobrake
operation.
Location
The autobrake pressure control module is on the ceiling of the
main landing gear wheel well.
Physical Description
The autobrake pressure control module is an LRU and contains
these LRUs:
* Filter
* Control valve pressure switch
* Solenoid valve pressure switch
* Control valve
* Solenoid valve.
Training Information Point
Obey these cautions when you remove and install LRUs on the
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