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The normal antiskid valves release unwanted brake pressure
through the parking brake valve. Therefore, the antiskid system
monitors the parking brake system for a fault. When the parking
brake valve is not in its commanded position, the parking brake
relay does not send a ground to the AACU. This causes a fault
in the outboard and inboard antiskid, and the amber ANTISKID
INOP light comes on.
The amber ANTISKID INOP light also comes on for these
conditions if the alternate brake selector valve is pressurized:
* Inboard or outboard antiskid card fault
* Inboard or outboard antiskid power fault
* One or more transducer faults
* Alternate antiskid valve fault.
Training Information Point
When there is a fault in the antiskid system, the autobrake
system is inoperative.
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General
The antiskid/autobrake control unit (AACU) uses the autobrake
card to control the autobrake system for landing and rejected
takeoff.
The antiskid/autobrake control unit gets power from bus 1 and 2
main dc buses. This power also goes to the AUTO BRAKE
select switch.
Functional Description
When you move the AUTO BRAKE select switch to the OFF
position, it sends power to energize the autobrake disarm relay
to the reset position. The 1, 2, 3, MAX, or RTO contacts on the
select switch send the select switch position data to the AACU.
When all the conditions for arming the system occur, the AACU
sends power to the autobrake pressure control module to
control autobrake pressure to the brake system. This slows and
stops the airplane at the deceleration rate the pilot selects.
These components send signals to the AACU:
* Thrust lever position from the autothrottle microswitch packs
* Air/ground from the proximity switch electronics unit
* Speed brake lever arm switch
* Metered pressure switches
* Ground speed from the air data inertial reference unit
* Control valve pressure switch monitored for faults in the
autobrake pressure control module control valve
* Solenoid valve pressure switch monitored for faults in the
autobrake pressure control module solenoid valve.
These switches are used for arm and disarm of the autobrake
operation.
When a disarm condition occurs, the AACU removes power
from the solenoid and control valves on the autobrake pressure
control module. It also sends a ground to energize the
autobrake disarm relay to the disarm position. The disarm
relay sends a ground to make the AUTO BRAKE DISARM light
come on.
To reset the autobrake disarm relay, move the AUTO BRAKE
select switch to the OFF position. This will turn the amber AUTO
BRAKE DISARM light off when the autobrake system is
disarmed, and the AUTO BRAKE select switch is not in the
OFF position.
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General
The autobrake system controls autobrake pressure to stop the
airplane at the selected deceleration rate.
Landing Arm Logic
The autobrake system arms for landing when all of these
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