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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:

STBY PITOT HT FAIL
(Caution)

DDG Reference: None
Pilot Action (QRH): ABNORM 11-8
System Description: 30-31-00
Schematic Diagram: 30-31-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 30-31-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

The STBY PITOT STATIC probe heater circuit has been detected open circuit by HBMU 2.

Possible Causes:

  • Standby Pitot Static Probe Heater
  • Heater/Brake-Temperature Monitoring Unit (HBMU) 2
  • Associated wiring between HBMU2 and Standby Pitot Static Probe

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 Pitot-Static Probes AMM 34-11-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of Pitot-Static Probes AMM 34-11-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair SPM 20-12-10 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Perform wiring checks between HBMU2 and standby pitot static probe heater.

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

  2. Measure the resistance of pitot standby static probe heater.
    STBY PITOT-STATIC head heater should be 20 ohms ±10 ohms at ambient temperature.
    STBY PITOT-STATIC probe base heater should be 210 ohms approximately.

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

  3. Replace standby pitot static probe.

    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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