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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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10/31/19

Message Overview:

YD HEAT 2 FAIL
(Advisory)

DDG Reference: 30-31-01
Pilot Action (QRH): ADVISORY 10-4
System Description: 30-31-00
Schematic Diagram: 22-13-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 30-31-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

The Right Yaw Damper Actuator Heater circuit has been detected opened by HBMU2.

Possible Causes:

  • Yaw Damper Actuator 2 Heater
  • Interface wiring between the Heater/Brake-Temperature Monitoring Unit (HMBU) 2 and Yaw Damper Actuator 2 Heater
  • Yaw Damper Actuator
  • Heater/Brake-Temperature Monitoring Unit (HMBU) 2

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: 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 Yaw Damper Actuator AMM 22-13-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of Yaw Damper Actuator AMM 22-13-01-400-801 [ 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 yaw damper actuator 2 heater.

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

  2. Measure the resistance of yaw damper actuator 2 heater.
    Yaw damper actuator 2 heater = 37.8 ohms ±10%.

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

  3. Replace yaw damper actuator.

    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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