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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

11/24/25

Message Overview:

Message Name:

LEFT HBMU

Message Code:

30303FFHBM

Associated CAS:

L PROBE MON FAIL
(Advisory)

Reporting LRU: Heater/Brake-Temperature Monitoring Unit (HMBU) 1
System Description: 30-31-00 - Air Data Probes And Sensors
Schematic Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] 30-31-00  - Air Data Probes And Sensors Heat Control - Electrical Schematic
Wiring Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] 30-31-02 -  Air Data And Sensors Heat Control System (Left)

Message Description:

Left Heater/Brake-Temperature Monitoring Unit (HBMU) internal fault.

Possible Causes:

  • Heater/Brake-Temperature Monitoring Unit (HBMU) 1 (A121)

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

Quick Links:

Standard Aircraft Configuration for Maintenance [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM12-00-00-867-801
Connect Electrical Power to the Aircraft [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-861-801
Electrical/Electronic Safety Precautions [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-910-801
Electrostatic Discharge Safety Precautions [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-910-802
Removal of the Heater/Brake-Temperature Monitoring Unit (HBMU) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM30-31-01-000-801
Installation of the Heater/Brake-Temperature Monitoring Unit (HBMU) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM30-31-01-400-801
Access to Active Faults [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-802
Access to Stored Faults [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-803
Access to System Diagnostics [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-804

Troubleshooting Recommendations:

  1. Replace left HBMU.
  2. Do close out.

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