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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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03/26/21

Message Overview:

Message Name:

NO TTR-TX-1 BUS OUTPUT

Message Code:

B3-008058

Associated CAS:

None

Reporting LRU: TCAS CH A
System Description: 34-43-00
Schematic Diagram: 34-43-00
Wiring Diagram: 34-43-01

Message Description:

TTR-TX-1 bus data is absent at L-TDR; TTR data is NOT absent at R-TDR.

Possible Causes:

  • Traffic Alert and Collision-Avoidance System (TCAS) Transceiver (A5)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 9
  2. Comp Id = A005
  3. {Term Definitions}

    1. TDR1-5 1X 350 01 EXCT XXXX-TXXX XXXX-XXXX XXXX-XXXX 350: 28;NO TTR-TX-1 IN
    2. TDR2-14 2X 350 10 EXCT XXXX-XXXX TFTT-FFTT XXXX-XXXX 350: (B3);TCAS BUS INACT

Quick Links:

Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Suspect the TTR, or wiring. If still in standby the TDR may still be flagging both TTR busses failing.

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