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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:

L AOA HEAT FAIL
(Caution)

Dispatch Deviation Guide None
Pilot Action (QRH): ABNORM 11-8
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 AOA 1 HEATER circuit has been detected open by HBMU 1.

Possible Causes:

  • Interface wiring between AOA1 HEATER (either vane or case) and Heater/Brake-Temperature Monitoring Unit (HMBU) 1
  • Angle-of-Attack (AOA) 1 Heater
  • Heater/Brake-Temperature Monitoring Unit (HMBU) 1

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 

NOTES: None

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 Angle-of-Attack Sensors AMM 27-32-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of Angle-of-Attack Sensors AMM 27-32-09-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair SPM 20-12-10 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Perform wiring checks between HBMU1 and  AOA1 Vane & Case heaters.

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

  2. Measure the resistance of AOA1 Vane & Case heaters.
    AOA vane heater = 30 ±10 ohms
    AOA case heater = 30 ±12 ohms

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

  3. Replace AOA1.

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

  4. Swap HBMUs
  5. Do close out.

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