TCAS -TCAS COMPUTER -FUNCTIONAL DESCRIPTION
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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:
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From the maintenance access terminal (MAT)
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From the front panel test switch.
TCAS Self-Test Indications -ND
During a self-test, the ND shows this data:
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A cyan message, TCAS TEST
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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
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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
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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
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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
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777 AIRCRAFT MAINTENANCE MANUAL
TCAS -TEST DISPLAYS
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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:
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All LED display segments come on for 3 seconds
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All LED segments go off for 3 seconds
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The applicable LED code shows the status of TCAS.
These are the TCAS fault codes:
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OK, no failure
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TP, TCAS processor
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T1, top antenna element #1
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T2, top antenna element #2
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T3, top antenna element #3
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T4, top antenna element #4
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B1, bottom antenna element #1
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B2, bottom antenna element #2
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B3, bottom antenna element #3
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B4, bottom antenna element #4
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X1, mode S transponder #1
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X2, mode S transponder #2
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RA, radio Altimeter #1 and #2
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PT, pitch attitude data
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RL, roll attitude data
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HD, heading data
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RD, RA display #1 and #2
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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.
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777 AIRCRAFT MAINTENANCE MANUAL
TCAS -SELF-TEST
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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:
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Traffic symbols on the NDs
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Up and down preventative advisories on the PFDs
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TCAS TEST PASS or FAIL aural at the end of the test.
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777 AIRCRAFT MAINTENANCE MANUAL
TCAS -GROUND TESTS
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