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When the alternate brake pressure switch has pressure, it
sends signals to the alternate antiskid sense relay and the flight
data aquisistion unit (FDAU).
The AACU sends signals to the auto speedbrake module when
each wheel speed is more than 60 knots. The auto speedbrake
module uses the wheel speed input to operate the auto
speedbrake actuator during the RTO function.
See the air/ground system section for more information about
the PSEU. (SECTION 32-09)
See the parking brake system section for more information
about the parking brake system. (SECTION 32-44)
See the flight data recording system (FDRS) section for more
information about the FDAU. (SECTION 31-31)
See the speedbrake control system section for more
information about the auto speedbrake system.
(SECTION 27-62)
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ANTISKID/AUTOBRAKE SYSTEM - ANTISKID GENERAL DESCRIPTION
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General
The autobrake system applies the brakes to stop the airplane
after it lands or during a rejected takeoff.
These are the autobrake components of the antiskid/autobrake
system:
* Antiskid/autobrake control unit (AACU)
* AUTO BRAKE select switch
* Autobrake pressure control module
* Autobrake shuttle valves (2)
* AUTO BRAKE DISARM amber light.
The autobrake system does not operate with the alternate
hydraulic brake system.
Antiskid/Autobrake Control Unit
The antiskid/autobrake control unit controls autobrake
operation. The antiskid/autobrake control unit gets inputs from
these sources:
* Speed brake arming switch
* Autothrottle switch packs (2)
* ADIRU (2)
* PSEU
* Autobrake pressure control module
* Autobrake shuttle valve (2)
* Transducers (4).
AUTO BRAKE Select Switch
The AUTO BRAKE select switch lets the pilot select a rate of
deceleration to the antiskid/autobrake control unit for landing
autobrake or rejected takeoff (RTO) braking operation.
Autobrake Pressure Control Module
The autobrake pressure control module sends autobrake
pressure through the autobrake shuttle valves to the normal
brake system. Hydraulic system B supplies pressure to the
autobrake pressure control module.
Autobrake Shuttle Valve
The autobrake shuttle valve sends autobrake pressure to the
normal brake system. It does this when normal metered
pressure is less than autobrake pressure. The metered
pressure switch on the autobrake shuttle valve sends signals
to the antiskid/autobrake control unit when the normal brake
metering valves supply pressure.
AUTO BRAKE DISARM Amber Light
The AUTO BRAKE DISARM amber light comes on when the
pilot selects autobrakes and any of these conditions occur:
* Malfunction in the autobrake system
* Malfunction in the antiskid system
* Autobrake system is manually disarmed.
ANTISKID/AUTOBRAKE SYSTEM - AUTOBRAKE GENERAL DESCRIPTION
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General Description
You select an autobrake landing rate of deceleration or RTO
braking with the AUTO BRAKE select switch.
When all conditions for arming and application are correct, the
AACU controls the autobrake pressure control module. The
autobrake pressure control module sends autobrake pressure
to the brakes through the normal hydraulic brake system. The
autobrake pressure control module also sends brake pressure
electrical signals 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)
The AACU sends signals to the auto speedbrake module when
each wheel speed is more than 60 knots. The auto speedbrake
　
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