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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

09/05/19

Message Overview:

Fault Message:

INTERFACE - FWC 1 BUS FAULT

Fault Code:

3440104AE

Associated CAS:

GND PROX FAIL
(Advisory)

GPWS SYSTEMS FAIL
(Advisory)

TERR FAIL
(Advisory)

Reporting LRU: Enhanced Ground-Proximity Warning System (EGPWS)
System Description: 34-42-00
Schematic Diagram: 34-42-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 34-41-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]
34-42-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

Loss of communication on ARINC 429 Fault Warning Computer (FWC) bus from Integrated Avionics Computer (IAC) 1 is detected by Enhanced Ground-Proximity Warning System (EGPWS) Computer.

Possible Causes:

  • Integrated Avionics Computer (IAC) 1 (A11)
  • Enhanced Ground-Proximity Warning System (EGPWS) Computer (A64)
  • Junction Box (JB) 5
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter:

Quick Links:

Removal of the Integrated Avionics Computers (IAC) AMM 31-41-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Integrated Avionics Computers (IAC) AMM 31-41-01-400-801 [ 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. Consult EGPWS - NFF reduction before performing the troubleshooting.
  2. Swap IAC 1 with IAC 2.

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

  3. Perform wiring checks between IAC 1, JB5 and EGPWS Computer.

    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: Remove all interface components for short circuit checks.

  4. Replace EGPWS Computer.

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

  5. Replace JB5.
  6. Do close out.

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