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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

08/28/19

Message Overview:

Fault Message:

DAU4A/WRG/HUDC MON FAULT

Fault Code:

3430019HUD

Associated CAS:

None

Reporting LRU: Head-Up Display (HUD) Computer
System Description: 34-32-00
Schematic Diagram: 34-32-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 31-42-08 [ Global Express ]  [ G5000 ]  [ Global XRS ]
34-32-04 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

Head-Up Display System (HUD) does not receive data from the Data Acquisition Unit 4 (DAU 4).

Possible Causes:

  • Head-Up-Display (HUD) Computer (A250)
  • Data Acquisition Unit (DAU) 4 (A31)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

If the message DAU 4A FAIL (Cyan) shows on the EICAS, do the fault isolation for the DAU 4.

Quick Links:

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 ]
Removal of the Head-Up-Display (HUD) Computer AMM 34-32-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Head-Up-Display (HUD) Computer AMM 34-32-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Swap DAU 4 with DAU 2.

    1. If system checks are good, replace DAU 4 and do close out.
    2. If fault remains, continue with next step.

  2. Perform wiring checks between DAU 4A, JB4 and HUDC.

    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.
      NOTE: When short circuit is detected, remove all interface components and reinstall one at a time to isolate short (interface components include CPC2, ACSC2, SFCU2, BMC 2, LGECU and SPC).

  3. Replace HUDC.
  4. Do close out.

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