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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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Quick Links

03/29/21

Message Overview:

Message Name:

INTERNAL FAULT

Message Code:

B3-008072

Associated CAS:

None

Reporting LRU: TCAS LOWER ANT
System Description: 34-43-00
Schematic Diagram: 34-43-00
Wiring Diagram: 34-43-01
34-43-09

Message Description:

Failure in TCAS lower antenna.

Possible Causes:

  • Traffic Alert And Collision-Avoidance System (TCAS) Omnidirectional Antenna (E11)
  • TCAS Transceiver (A5)
  • Coaxial Cable
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Traffic Alert and Collision-Avoidance System (TCAS)Traffic Surveillance System (TSS) Directional Antenna (Post SB100-34-11) AMM 34-43-09-000-801
Installation of the Traffic Alert and Collision-Avoidance System (TCAS)Traffic Surveillance System (TSS) Directional Antenna (Post SB100-34-11) AMM 34-43-09-400-801
Removal of the Traffic Alert and Collision-Avoidance System (TCAS) and Traffic Surveillance System (TSS) Omnidirectional Antenna (Pre SB100-34-11) AMM 34-43-13-000-801
Installation of the Traffic Alert and Collision-Avoidance System (TCAS) and Traffic Surveillance System (TSS) Omnidirectional Antenna (pre SB100-34-11) AMM 34-43-13-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

Troubleshooting Recommendations:

  1. Reset TCAS Circuit Breaker CB1-A6. Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, do close out.

  2. Do wiring check between TCAS (A5) and the TCAS Lower Antenna (E11) for the following cables:

    From To Results
    Conn. A5BP1 - 1 Conn. E11P1 - 1
    Conn. A5BP1 - 2 Conn. E11P1 - 2
    Conn. A5BP1 - 3 Conn. E11P1 - 3
    Conn. A5BP1 - 4 Conn. E11P1 - 4

    1. If check is satisfactory, continue with next step.
    2. If check is not satisfactory, repair defective cable.
      NOTE: Conn. E11P1 - 2, Conn. E11P1 - 3 and Conn. E11P1 - 4 are not connected (bag & Stow) at TCAS Lower Antenna for Aircraft pre SB100-34-11. However, coaxial cables must be check.

  3. Replace TCAS Lower Antenna (E11). Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, do close out.

  4. Replace TCAS (A5).
  5. Do close out.

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