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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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08/09/21

Message Overview:

Message Name:

NO LB-RIU-8 BUS INPUT

Message Code:

B3-539743

Associated CAS:

None

Reporting LRU: TSS-4100
System Description: 34-43-00
Schematic Diagram: 34-43-00
Wiring Diagram: 23-51-23
34-43-01

Message Description:

TSS is reporting LB-RIU-8 bus inactive while LB-RIU-8 is not reported inactive by the L-HF radio.

Possible Causes:

  • Traffic Alert and Collision-Avoidance System (TCAS) Transceiver (TSS-4100) (A238)
  • Junction Box (JB3)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Junction Box JB3 AMM 24-63-09-000-802
Installation of the Junction Box JB3 AMM 24-63-09-400-802
Removal of the Traffic/Collision Avoidance System (TCAS) and Traffic Surveillance System (TSS) Transponder Unit AMM 34-43-03-000-801
Installation of the Traffic/Collision Avoidance System (TCAS) and Traffic Surveillance System (TSS) Transponder Unit AMM 34-43-03-400-801
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/XPDR 1 Circuit Breaker CB1-A5. Is the fault message still present?

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

  2. Do wiring check between Traffic/Collision Avoidance System (TCAS) and Traffic Surveillance System (TSS) Transponder Unit (A238) and the Junction Box No. 3 (JB3) for the following wires:

    From To Results
    A238BP1 - 7D JB3DP1 - 12D
    A238BP1 - 7C JB3DP1 - 12E

    1. If wiring check is not satisfactory, repair the defective wire.
    2. If wiring check is satisfactory, continue with next step.

  3. Replace Traffic/Collision Avoidance System (TCAS) and Traffic Surveillance System (TSS) Transponder Unit (A238). Is the fault message still present?

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

  4. Replace the Junction Box No. 3 (JB3).
  5. Do close out.

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