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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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07/01/21

Message Overview:

Message Name:

TCAS AURAL WARNING FUNCTION DOES NOT OPERATE

Message Code: 344OBS020
Effectivity: All
System: Traffic/Collision Avoidance System
System Description: 34-43-00
Schematic Diagram: 34-43-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 23-51-57 [ Global Express ]  [ G5000 ]  [ Global XRS ]
34-43-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

The aural and/or the visual warning for the Ground Proximity Warning System (GPWS) failed to come on during an alert condition.

Possible Causes:

  • Traffic/Collision Avoidance System (TCAS) (A7)
  • Ground Proximity Warning System (GPWS) (A64)
  • Audio Panel 1 (A8)
  • Audio Panel 2 (A9)
  • Audio Panel 3 (A215)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

NOTE: The TCAS Cooling fan does not have a monitoring device to report malfunction. Make sure you perform the Operational Test of the Traffic/Collision Avoidance System (TCAS) Cooling Fan while performing the troubleshooting Recommendations below.

Quick Links:

Removal of the Audio Panels AMM 23-51-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Audio Panels AMM 23-51-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Enhanced Ground-Proximity Warning System (EGPWS) Computer AMM 34-42-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Enhanced Ground-Proximity Warning System (EGPWS) Computer AMM 34-42-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational Test of the Traffic/Collision Avoidance System (TCAS) AMM 34-43-00-710-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Traffic/Collision Avoidance System (TCAS) Receiver/Transmitter AMM 34-43-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Traffic/Collision Avoidance System (TCAS) Receiver/Transmitter AMM 34-43-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Perform wiring checks between TCAS Receiver/Transmitter, Audio panels and TM113.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.
      NOTE: Remove all interface components for short circuit checks.

  2. Replace defective Audio Panel.

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

  3. Replace TM113.

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

  4. Replace EGPWS Computer.
  5. Do close out.

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