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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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For AOG assistance contact:

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Quick Links

03/31/21

Message Overview:

Message Name:

FAN FAILURE

Message Code:

B3-539746

Associated CAS:

TSS FAN FAIL
(Advisory)

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

Message Description:

The fan speed is below the expected value.

Possible Causes:

  • Traffic Alert/Collision Avoidance System (TCAS) and Traffic Surveillance System (TSS) Unit Mounting Tray
  • Traffic Alert/Collision Avoidance System (TCAS) and Traffic Surveillance System (TSS) Unit (A238)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

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
Removal of the Traffic/Collision Avoidance System (TCAS) and Traffic Surveillance System (TSS) Transponder Unit Mounting Tray AMM 34-43-07-000-801
Installation of the Traffic/Collision Avoidance System (TCAS) and Traffic Surveillance System (TSS) Transponder Unit Mounting Tray AMM 34-43-07-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset TCAS/XPDR1 (CB1-A5) circuit breaker.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  2. Confirm presence of the 28 VDC and Ground at the TSS cooling fan connector A187P1. Repair/replace as required.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  3. Do the wiring check between TSS connector A238BP1 and TSS cooling fan A187P1. Repair/replace as required.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  4. Replace the TSS Mounting Tray.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  5. Replace TSS.
  6. Do close out.

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