- TCAS FAIL Message:
Notes:
- The amber TCAS FAIL message indicates a TCAS failure. The message shows in all NAV Data Display modes regardless of whether the TFC button on the EFIS Control Panel is pressed ON or OFF.
- The TCAS FAIL message can show for faults that are external to the TCAS Computer as well as for faults that are internal to the TCAS Computer.
- When the selected ATC Transponder has failed the TCAS will indicate failure until the alternate operational ATC Transponder is selected.
- An air/ground discrete short to ground, or an RA status discrete from the DEUs is grounded, can cause the TCAS FAIL message to show and will not cause a maintenance message on the TCAS Computer.
TCAS FAIL Message Possible Causes:Before replacing any component perform BITE if available. (TCAS Processor and ATC Transponder bite check in main E&E.)
1.TCAS Computer
2.ATC Transponder
3.Antenna
4.Wiring
TCAS Failed Message:
Circuit Breakers:TCAS: P18-1 = B6.
ATC Transponder #1: P18-1 = B5.
ATC Transponder #2: P6-1 = D14.
Applicable deferrals MEL 34-40 Traffic Collision / Avoidance System (TCAS)