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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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08/06/24

Message Overview:

TAT HT 3 FAIL
(Advisory)

DDG Reference: 34-11-01
Pilot Action (QRH): ADVISORY 10-4
System Description: 30-31-00
Schematic Diagram: 30-31-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 30-31-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

The TAT3 Heater circuit has been detected opened by HBMU1.

Possible Causes:

  • Interface wiring between Heater/Brake-Temperature Monitoring Unit (HMBU) 3 and Total Air Temperature (TAT) 3
  • Total Air Temperature (TAT) 3 Heater
  • Heater/Brake-Temperature Monitoring Unit (HMBU) 3

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM):

  •  [ Global Express ]  [ G5000 ]  [ Global XRS ] FON 01-16 ICE-002, [PITOT 1 (2) (3) HT FAIL] (Caution/Amber), [L (R) AOA HEAT FAIL] (Caution/Amber), [STBY PITOT HT] (Caution/Amber), [ICE DETECTOR FAULT] (Advisory/Cyan), [L (R) PROBE MON FAIL] (Advisory/Cyan) or [TAT HT 1 (2) (3) FAIL] (Advisory/Cyan) On Ground.

Quick Links:

Removal of Heater/Brake-Temperature Monitoring Unit (HMBU) AMM 30-31-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of Heater/Brake-Temperature Monitoring Unit (HMBU) AMM 30-31-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of Total Air Temperature (TAT) Probes AMM 73-21-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of Total Air Temperature (TAT) Probes AMM 73-21-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair SPM 20-12-10 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Perform wiring checks between HBMU 1 and TAT 3 heater.

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

  2. Measure the resistance of TAT 3 heater.
    NOTE: TAT 3 heater should be approximately 20 ohms at ambient temperature.

    1. If resistance within range, go to step 4.
    2. If resistance out of range, continue with next step.

  3. Replace the TAT 3 probe.

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

  4. Swap HBMU 1 with HBMU 2.
  5. Do close out.

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