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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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Quick Links

07/22/19

Message Overview:

Fault Message:

TAT1 HEATER (LEFT ENG) / WRG

Fault Code:

3030102HBM

Associated CAS:

TAT HT 1 FAIL
(Advisory)

Reporting LRU: Heater/Brake-Temperature Monitoring Unit (HBMU) 1
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 ]

Fault Description:

The Total Air Temperature (TAT) 1 Heater circuit has been detected opened by Heater/Brake-Temperature Monitoring Unit (HBMU) 1.

Possible Causes:

  • Total Air Temperature (TAT) 1 Heater
  • Heater/Brake-Temperature Monitoring Unit (HBMU) 1 (A121)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Heater/Brake-Temperature Monitoring Unit (HBMU) AMM 30-31-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Heater/Brake-Temperature Monitoring Unit (HBMU) AMM 30-31-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Total Air Temperature (TAT) Probes AMM 34-11-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Total Air Temperature (TAT) Probes AMM 34-11-05-400-801 [ 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 HBMU 1 and TAT 1 heater.

    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.

  2. Measure the resistance of TAT 1 heater.
    TAT 1 heater should be 16-26 ohms at ambient temperature.

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

  3. Replace TAT 1 probe Heater.

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

  4. Replace HBMU 1.
  5. Do close out.

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