TCAS -TCAS COMPUTER -FUNCTIONAL DESCRIPTION
EFFECTIVITY BEJ ALL 34-45-00
Page 47
D633W101-BEJ Jan 05/2002
TCAS -TEST DISPLAYS
General
When a self-test starts, TCAS test indications go to the PFDs, NDs, and the front panel of the TCAS computer. At the end of the test, a TCAS test aural comes on at the aural warning speakers.
There are two ways to start a self-test:
*
From the maintenance access terminal (MAT)
*
From the front panel test switch.
TCAS Self-Test Indications -ND
During a self-test, the ND shows this data:
*
A cyan message, TCAS TEST
*
Amber TA traffic symbol at the 9:00 position, -200 feet relative altitude with an up vertical motion arrow and 2 nm distance from the airplane center
*
White other traffic symbol at the 11:00 position, +1000 feet relative altitude with no vertical motion arrow and 3.6 nm distance from the airplane center
*
White proximate traffic symbol at the 1:00 position, -1000 feet relative altitude with a down vertical motion arrow and 3.6 nm distance from the airplane center
*
Red RA traffic symbol at the 3:00 position, +200 feet relative altitude with no vertical motion arrow and 2 nm distance from the airplane center.
If the test fails, the message TCAS FAIL replaces the TCAS TEST message.
TCAS Self-Test Indications -PFD
During a self-test, the PFD shows the red RA preventative down advisory and red RA preventative up advisory cues on the attitude display.
TCAS Self-Test Aurals
When the test completes with no faults, the aural message TCAS SYSTEM TEST OK comes on. If the BITE detects a fault during the self-test, the aural message is TCAS SYSTEM TEST FAIL.z
EFFECTIVITY BEJ ALL 34-45-00
Page 48
D633W101-BEJ Sep 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
TCAS -TEST DISPLAYS
EFFECTIVITY BEJ ALL 34-45-00
Page 49
D633W101-BEJ Jan 05/2002
TCAS -SELF-TEST
Front Panel Self-Test
Push and hold the test switch on the front panel to start a self-test. During the test, the front panel shows:
*
All LED display segments come on for 3 seconds
*
All LED segments go off for 3 seconds
*
The applicable LED code shows the status of TCAS.
These are the TCAS fault codes:
*
OK, no failure
*
TP, TCAS processor
*
T1, top antenna element #1
*
T2, top antenna element #2
*
T3, top antenna element #3
*
T4, top antenna element #4
*
B1, bottom antenna element #1
*
B2, bottom antenna element #2
*
B3, bottom antenna element #3
*
B4, bottom antenna element #4
*
X1, mode S transponder #1
*
X2, mode S transponder #2
*
RA, radio Altimeter #1 and #2
*
PT, pitch attitude data
*
RL, roll attitude data
*
HD, heading data
*
RD, RA display #1 and #2
*
PP, program pins
If more than one fault exists, the fault codes show one at a time.
Training Information Point
The maintenance manual and the fault isolation manual do not have a task for the line maintenance technician to do a test from the front panel of the TCAS computer. You must do all tests for the TCAS computer from the MAT or a PMAT.
Many LRUs on the 777 are compatible with other model airplanes that do not have a central maintenance computing system (CMCS). For that reason, these LRUs have a front panel test feature.
EFFECTIVITY BEJ ALL 34-45-00
Page 50
D633W101-BEJ Sep 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
TCAS -SELF-TEST
EFFECTIVITY BEJ ALL 34-45-00
Page 51
D633W101-BEJ Jan 05/2002
TCAS -GROUND TESTS
General
You can do a TCAS system test from the MAT.
TCAS System Test
The TCAS system test makes sure the TCAS computer and its interfaces operate properly.
You get these indications when you do a system test:
*
Traffic symbols on the NDs
*
Up and down preventative advisories on the PFDs
*
TCAS TEST PASS or FAIL aural at the end of the test.
EFFECTIVITY BEJ ALL 34-45-00
Page 52
D633W101-BEJ Sep 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
TCAS -GROUND TESTS
EFFECTIVITY BEJ ALL 34-45-00 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：777 AMM 飛機維護手冊 導航 Navigation 1(59)
