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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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08/28/19

Message Overview:

Fault Message:

GPWS/WRG/ COM FAULT

Fault Code:

343001AHUD

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: 34-32-03 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

Head-Up Display System (HUD) does not receive data from the Ground Proximity Warning System (GPWS).

Possible Causes:

  • Head-Up-Display (HUD) Computer (A250)
  • Ground Proximity Warning System (GPWS) (A64)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

If the EICAS message GPWS SYSTEMS FAIL (Cyan) shows, do the fault isolation for the GPWS.

Quick Links:

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 ]
Removal of the Enhanced Ground-Proximity Warning System (EGPWS) Computer AMM 34-42-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Enhanced Ground-Proximity Warning System (EGPWS) Computer AMM 34-42-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Perform wiring check between EGPWS and HUDC as follow:

    From To Result
    A64BP1-C1 A250DP1-A1
    A64BP1-D1 A250DP1-B1
    GND A250DP1-C1
    A64BP1-SH A250DP1-SH

    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 component includes DAU 3).

  2. Replace EGPWS.

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

  3. Replace HUDC.
  4. Do close out.

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