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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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01/28/21

Message Overview:

TSS FAN FAIL
(Advisory)

DDG Reference: 34-54
Pilot Action (QRH): AVNC 02-39
System Description: 34-43-00
Schematic Diagram: 34-43-00
System Wiring: 34-43-01

Message Description:

The cyan 'TSS FAN FAIL' advisory CAS message indicates that the fan speed is below the expected value. Air flow is blowing up through the TSS. This message is displayed when the TSS is powered, but the fan on the TSM-4100 is not operating properly. It is inhibited when either transponder reports a failure.

Possible Causes:

  • Traffic Alert/Collision Avoidance System (TCAS) and Traffic Surveillance System (TSS) Mounting Tray (TSM-4100 A187)
  • Traffic Alert/Collision Avoidance System (TCAS) and Traffic Surveillance System (TSS) Unit (A31)
  • Associated Wiring A187P1-C FAN CTRL ON/OFF IN
  • Associated Wiring A187P1-E FAN MONITOR OUT

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 Air Traffic Control (ATC) Transponder AMM 34-54-01-000-801
Installation of the Air Traffic Control (ATC) Transponder AMM 34-54-01-400-801
Functional Test of the Traffic Surveillance System (TSS) AMM 34-54-01-720-804
Functional Test of the Transponder (TDR) AMM 34-54-01-720-805
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. Interrogate the MDC as follows:

    1. On the cursor control panel (CCP), ensure the toggle switch is to the right and select Anti-Ice, ECS and Fuel buttons simultaneously. The MDC main menu should now be displayed on Display Unit #3.
    2. Using the joystick, select Current Faults (if the fault is active) or Aircraft History to research stored faults. From Aircraft History you can then select Fault Message History and locate the error condition fault logged.
    3. Select the MDC fault from the drop down below to provide additional information to assist in troubleshooting.

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

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

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

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

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

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  5. Replace the TSS Mounting Tray (TSM).

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  6. Replace the TSS.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  7. Do close out.

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