ANTISKID/AUTOBRAKE SYSTEM -COMPONENT LOCATIONS
EFFECTIVITY BEJ ALL 32-42-00
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D633W101-BEJ Jan 05/2002
ANTISKID/AUTOBRAKE SYSTEM -AUTOBRAKE SELECTOR
Purpose
The autobrake selector permits selection of a landing autobrake deceleration rate or the rejected takeoff function.
Location
The autobrake selector is on the P2 center forward panel below the landing gear handle.
Functional Description
The autobrake selector is an eight-position selector. A latch solenoid holds the selector in all positions except OFF and DISARM. The BSCU controls the latch solenoid.
There is a detent between the OFF and DISARM positions. You must push the selector as you move it from OFF to DISARM or from DISARM to OFF. There is no detent between the OFF and RTO positions of the autobrake selector.
Positions 1 through MAX AUTO set the rate of deceleration for autobrake operation after landing. For each level of deceleration, the BSCU controls the autobrake pressure to a maximum limit. The BSCU uses a 0.1 second time delay for autobrake application after landing.
If a disarm condition occurs when the selector is in 1 through MAX AUTO, the latch solenoid releases the selector to DISARM.
The RTO position commands maximum brake pressure for a rejected takeoff. There is no time delay before RTO autobrake application.
The latch solenoid releases the selector from the RTO position to the OFF position when the airplane goes in the air.
Training Information Point
One of these memo messages shows when the autobrake selector is in a landing autobrake position or in the RTO position:
*
AUTOBRAKE 1
*
AUTOBRAKE 2
*
AUTOBRAKE 3
*
AUTOBRAKE 4
*
AUTOBRAKE MAX
*
AUTOBRAKE RTO.
EFFECTIVITY BEJ ALL 32-42-00
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D633W101-BEJ Sep 05/2002
ANTISKID/AUTOBRAKE SYSTEM -AUTOBRAKE SELECTOR
EFFECTIVITY BEJ ALL 32-42-00
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D633W101-BEJ Jan 05/2002
ANTISKID/AUTOBRAKE SYSTEM -ANTISKID TRANSDUCER
Purpose
Antiskid transducers supply wheel speed data to the BSCU to get wheel deceleration input. These data also goes to the BSCU for autobrake operation.
Location
There are twelve antiskid transducers. The antiskid transducer is in a support in each main landing gear axle.
Functional Description
Antiskid transducers are permanent magnetic devices with an internal rotor and stator.
An antiskid transducer cup attaches to the hubcap through a flexible bellows assembly. This bellows assembly makes installation adjustment allowances when it compresses. The hubcap turns with the MLG wheel. The cup connects to the antiskid transducer drive dog which turns the rotor in the antiskid transducer.
Training Information Point
The transducer is an LRU.
The antiskid transducer is part of an in-axle assembly. These components make up the in-axle assembly:
* Wheel interface unit
*
Antiskid transducer
*
Support.
You remove the in-axle assembly from the axle as a unit to get access to the antiskid transducer.
The system can operate with one unserviceable transducer on each six wheel truck if no other brake on that truck is deactivated.
EFFECTIVITY BEJ ALL 32-42-00
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D633W101-BEJ Sep 05/2002
ANTISKID/AUTOBRAKE SYSTEM -ANTISKID TRANSDUCER
EFFECTIVITY BEJ ALL 32-42-00
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D633W101-BEJ Jan 05/2002
ANTISKID/AUTOBRAKE SYSTEM -BRAKE SYSTEM CONTROL UNIT (BSCU) -INTRODUCTION
Purpose
The brake system control unit (BSCU) contains circuit cards for the antiskid and autobrake systems, and related BITE functions.
It sends brake release inputs to the antiskid valve modules and brake application inputs to the autobrake valve module.
The BSCU also:
*
Monitors the antiskid and autobrake systems for faults
*
Communicates with other airplane systems
*
Does the built-in-test functions.
Location
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