777 AIRCRAFT MAINTENANCE MANUAL
ANTISKID/AUTOBRAKE SYSTEM -INDICATIONS
EFFECTIVITY BEJ ALL 32-42-00
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D633W101-BEJ Jan 05/2002
ANTISKID/AUTOBRAKE SYSTEM -SYSTEM TESTS
General
These are the system tests for the antiskid and autobrake systems:
*
System interface
*
Antiskid brake release
*
Autobrake application
*
Wheelspeed transducer spin.
System Interface
You use the system interface test to do a test of the BSCU and of the wiring to some of the LRUs in the antiskid and autobrake systems. During the test, the brakes apply and release to check the operation of the autobrake and antiskid systems. This test also does a check of the correct operation of the sensor inputs to the BSCU.
Antiskid Brake Release
The brake release test releases the brake pressure for a selected brake through its antiskid valve. You must visually make sure the brake pressure releases. To do this, monitor the movement of the wear indicator pins.
Autobrake Application
The autobrake application test does a check of the autobrake system. The test applies and releases brake pressure to all the brakes.
Wheelspeed Transducer Spin
The wheelspeed transducer spin test lets you do a test of the antiskid transducers and their wiring. You manually turn the selected antiskid transducer during this test. You must turn the transducer at 20 rpm or more during the test.
You remove the hubcap to get access to the antiskid transducer.
EFFECTIVITY BEJ ALL 32-42-00
Page 58
D633W101-BEJ Sep 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
ANTISKID/AUTOBRAKE SYSTEM -SYSTEM TESTS
EFFECTIVITY BEJ ALL 32-42-00
Page 59
D633W101-BEJ Jan 05/2002
ANTISKID/AUTOBRAKE SYSTEM -LRU REPLACEMENT TESTS
General
These are the LRU replacement tests for the antiskid and autobrake systems:
*
Brake system control unit
*
Antiskid valve
*
Autobrake valve module
*
Wheelspeed transducer.
Brake System Control Unit
The brake system control unit replacement test does a check of the BSCU and of the wiring to some of the LRUs in the antiskid and autobrake systems. During the test, the brakes apply and release to check the operation of the autobrake and antiskid systems.
This test is almost the same as the system interface test in the system test menu.
Antiskid Valve
The antiskid valve replacement test lets you do a test of a selected antiskid valve. The test releases the brake pressure for the selected brake. You must visually make sure the brake pressure releases.
This test is the same as the antiskid brake release test in the system test menu.
Autobrake Valve Module
The autobrake valve module replacement test does a check of the autobrake system. The test applies and releases brake pressure to all of the brakes.
This test is the same as the autobrake application test in the system test menu.
Wheelspeed Transducer
The wheelspeed transducer replacement test lets you do a test of a selected antiskid transducer and its wiring. You manually turn the selected antiskid transducer during this test. You must turn the transducer at 20 rpm or more during the test.
This test is the same as the wheelspeed transducer spin test in the system test menu.
EFFECTIVITY BEJ ALL 32-42-00
Page 60
D633W101-BEJ Sep 05/2002
ANTISKID/AUTOBRAKE SYSTEM -LRU REPLACEMENT TESTS
EFFECTIVITY BEJ ALL 32-42-00
Page 61
D633W101-BEJ Jan 05/2002
ANTISKID/AUTOBRAKE SYSTEM -SPECIAL FUNCTIONS
General
You use the antiskid indication disable function after you deactivate a brake. Brakes may be deactivated by three methods:
*
Install a flight dispatch disconnect tool in the brake position on the related antiskid shuttle valve module (This deactivates normal braking only. Alternate braking is still available.)
*
Disconnect the brake line
*
Remove the brake.
You use the antiskid indication disable function to disable (remove) the ANTISKID advisory message for one MLG wheel on each MLG truck. This makes sure that the advisory message for antiskid failures on the selected wheel or wheels does not show.
The related ANTISKID status message can not be disabled.
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