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:
*
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
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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:
*
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

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X2, mode S transponder #2

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RA, radio Altimeter #1 and #2

*
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

*
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:
*
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.

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777 AIRCRAFT MAINTENANCE MANUAL

TCAS -GROUND TESTS

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