(2)
Continuity failure in the TCAS antennas or antenna cables
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MAINTENANCE MANUAL
(3)
Failure data or data leakage on the ARINC 429 data bus from the mode S Transponder.
(4)
Internal TCAS computer failures and failure of internal power supplies
(5)
Incorrect data from the radio altimeter.
(6)
Failures that occur in the TCAS computer/transponder rf loop-around test
(7)
If a failure makes the TCAS operate unsatisfactorily, the TCAS computer stops all TCAS operations and shows the applicable indication on the front panel of the TCAS computer.
N. The TEST switch on the TCAS computer starts a self test that operates as follows:
(1)
All of the LED indicators are normally off.
(2)
Push and hold for 2 seconds, the TEST button on the front panel of the TCAS computer.
(3)
All of the LED indicators come on.
(4)
The TTR PASS LED indicator stays on if there is no failure to the TCAS computer or other essential system that interface with TCAS .
(5)
The applicable LED failure indicator comes on if there is a failure. ~........................................................ | LEDs | FAILURE | .......................................................... | TTR PASS | TCAS OK (NO FAILURE) | .......................................................... | TTR FAIL | TCAS COMPUTER | .......................................................... | XPNDR | ATC TRANSPONDER OR DATA LINK| | | INTERFACE | .......................................................... | UPPER ANT | TOP TCAS ANTENNA | .......................................................... | LOWER ANT | BOTTOM TCAS ANTENNA | .......................................................... | RAD ALT | NO RADIO ALTITUDE DATA | .......................................................... | HDNG | NO HEADING DATA | .......................................................... | R/A | RA DISPLAY | .......................................................... | T/A | TA DISPLAY | 2.................…......................................1
3. Directional Antenna (Fig. 2)
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