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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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For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

08/06/24

Message Overview:

R AOA HEAT FAIL
(Caution)

DDG Reference: None
Pilot Action (QRH): ABNORM 11-8
System Description: 30-31-00
Schematic Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] 27-32-00 Stall Protection System
[ Global Express ]  [ G5000 ]  [ Global XRS ] 24-51-00 AC Load Distribution AC Power Center (ACPC) System
[ Global Express ]  [ G5000 ]  [ Global XRS ] 24-52-00 AC Load Distribution Cockpit Circuit Breaker Panel (CCBP) System.
Wiring Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] 30-31-02 Heat Control System (Right)
[ Global Express ]  [ G5000 ]  [ Global XRS ] 24-51-00 ACPC Distribution Left
[ Global Express ]  [ G5000 ]  [ Global XRS ] 24-51-00 ACPC Distribution Right
[ Global Express ]  [ G5000 ]  [ Global XRS ] 24-52-01 Cockpit Circuit Breaker Panel (CCBP)

Message Description:

The HBMU senses an AOA sensor heat fail condition.

Possible Causes:

  • Interface wiring between AOA2 HEATER (either Vane or Case) and Heater/Brake-Temperature Monitoring Unit (HMBU) 2
  • Angle-of-Attack (AOA) 2 Heater
  • Heater/Brake-Temperature Monitoring Unit (HMBU) 2

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:

  • Verify C/B status on both pilot and copilot EMS CDUs. This CAS Message will post if either of the following circuit breaker or Smart Contactor status is OUT or Tripped.

LOCATION CB NO. NAME
CCBP (A54) CB-H9 R AOA HEAT A
ACPC (A35) SC-K15 AC 1 FEED

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. Check status of AC 1 FEED on EMS CDU, the AC 1 Feed being out or tripped can drive multiple CAS to post.
    BUS > AC 1 > AC 1 FEED.

    1. If AC 1 FEED CB is IN go to step 3.
    2. If AC 1 FEED CB is OUT, set to IN.

      3. AC 1 FEED
      CB SYSTEM PHASE CAS
      CB-G6 ESS TRU 1 3 AC BUS 1 FAIL (Caution)
      CB-G3 EVS FAIRING HEAT 3 EVS HEAT FAIL (Caution)
      CB-G9 SLAT/FLAP PWR 1 3 SLAT-FLAP HALFSPD (Advisory)
      CB-H5 EVS WINDOW HEAT 1 EVS HEAT FAIL (Caution)
      CB-H6 A/T CTLR 1 A/T 1 FAIL (Advisory)
      A/T 2 FAIL (Advisory)
      CB-H7 PITOT 1 HT A 1 PITOT 1 HT FAIL (Caution)
      CB-H8 R ICE DETECTOR 1 ICE DETECTOR FAULT (Advisory)
      CB-H9 R AOA HEAT A 1 R AOA HEAT FAIL (Caution)
      CB-H10 L WSHLD HEAT 1 1 L WSHLD HEAT FAIL (Caution)
      CB-H11 L WSHLD HEAT 2 1 R WSHLD HEAT FAIL (Caution)
      CB-G12 TRU BAY FAN 3 ELEC SYS FAULT (Advisory)
      CB-B6 STAB TRIM CH1 3 STAB CH 1 FAIL (Advisory)

  2. Did the CAIMS Fault & CAS messages clear after setting AC 1 FEED CB to IN.

    1. If YES, do close out.
    2. If NO, go to next step.

  3. Perform wiring checks between HBMU2 and AOA2 Vane & Case heaters.

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

  4. Measure the resistance of AOA2 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.

  5. Replace AOA2.

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

  6. Interchange HBMUs.
  7. Do close out.
    Select related CAIMS message below:

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