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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

07/22/19

Message Overview:

Fault Message:

DAU1B NO DATA / WRG

Fault Code:

3030002HBM

Associated CAS:

None

Reporting LRU: Heater/Brake-Temperature Monitoring Unit (HBMU) 1
System Description: 30-31-00
Schematic Diagram: 30-31-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 31-42-05 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

Heater/Brake-Temperature Monitoring Unit (HBMU) 1 does not receive A429 DATA from Data Acquisition Unit (DAU) 1B.

Possible Causes:

  • Heater/Brake-Temperature Monitoring Unit (HBMU) 1 (A121)
  • Data Acquisition Unit (DAU) 1 (A17)
  • Junction Box (JB3)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

NOTE: Test Points are available in the Junction Box to monitor the different signals if needed.

Quick Links:

Removal of the Junction Box JB3 AMM 24-00-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Junction Box JB3 AMM 24-00-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Heater/Brake-Temperature Monitoring Unit (HBMU) AMM 30-31-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Heater/Brake-Temperature Monitoring Unit (HBMU) AMM 30-31-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Data Acquisition Units (DAU) AMM 31-42-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Data Acquisition Units (DAU) AMM 31-42-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Swap HBMU 1 with HBMU 2.

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

  2. Swap DAU 1 with DAU 3.

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

  3. Perform wiring checks between JB3, DAU 1 and HBMU 1.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  4. Replace JB3.
  5. Do close out.

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