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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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07/01/21

Message Overview:

Message Name:

GPWS WARNING FAILED DURING ALERT CONDITION

Message Code: 344OBS006
Effectivity: All
System: Enhanced Ground Proximity Warning-System (EGPWS)
System Description: 34-42-00
Schematic Diagram: 34-42-00 [ Global Express ]  [ G5000 ]  [ GlobalXRS ]
Wiring Diagram: 34-42-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

The Aural and/or the visual warning for the Ground Proximity Warning-System (GPWS) failed to come on during an alert condition.

Possible Causes:

  • Enhanced Ground-Proximity Warning System (EGPWS) (A64)
  • Audio Panel 1 (A8)
  • Audio Panel 2 (A9)
  • Data Acquisition Unit (DAU) 3 (A30)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter:

Quick Links:

Removal of the Audio Panels AMM 23-51-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Audio Panels AMM 23-51-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational Test of the Audio Panels AMM 23-51-05-710-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Connect Electrical Power to the Aircraft AMM 24-00-00-861-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Remove the Electrical Power from the Aircraft AMM 24-00-00-861-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Electrical/Electronic Safety Precautions AMM 24-00-00-910-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational Test of the Data Acquisition System AMM 31-42-00-710-801 [ 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 ]
Operational Test of the Enhanced Ground-Proximity
Warning System (EGPWS)		 AMM 34-42-00-710-801 [ 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 ]
Safety Precautions - Maintenance Practices - ALL SPM 20-00-01-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Remove the affected audio panel (A8 or A9) and perform a continuity check between the GPWC connector (A64BP1) and AUDIO PANEL 1 or 2 as follows:
    For Pilot's Audio Panel:

    From To Result
    A64BP1-C13 A8P2-m
    A64BP1-D13 A8P2-j
    A64BP1-SH A8P2-SH

    For Copilot's Audio Panel:

    From To Result
    A64BP1-C13 A9P2-m
    A64BP1-D13 A9P2-j
    A64BP1-SH A9P2-SH

    1. If there is no continuity, repair defective wiring as required and go to step 3.
    2. If there is continuity, continue with next step.

  2. Install the audio panel and perform the operational test of the audio panels.

    1. If the operational test are not satisfactory, perform troubleshooting for "Audio Panel 1" or "Audio Panel 2" and do close out.
    2. If the operational test are satisfactory, go to step 6.

  3. Perform the operational test of the GPWS system. Check if the warning GPWS displayed on the PFDs.

    1. If the warning GPWS is seen on PFDs, do close out.
    2. If the warning GPWS is not seen on PFDs, continue with next step.

  4. Remove the DAU 3 (A30) and access connector A30CP1. Perform a continuity check between the pins of the connectors DAU 3 (A30CP1) and GPWC (A64AP1) or (A64BP1) as follows:

    From To Result
    A64AP1-A2 A30CP1-F8
    A64AP1-B2 A30CP1-G8
    A64AP1-SH A30CP1-SH
    A64BP1-C1 A30CP1-D7
    A64BP1-D1 A30CP1-E7
    A64BP1-SH A30CP1-SH

    1. If there is no continuity, repair defective wiring as required and do close out.
    2. If there is continuity, continue with next step.

  5. Install the DAU 3 and perform the operational test of the DAU 3.

    1. If the operational test are not satisfactory, perform the troubleshooting for CAS message DAU 3A FAIL (Advisory) or DAU 3B FAIL (Advisory) and do close out.
    2. If the operational test are satisfactory, continue with next step.

  6. Replace GPWS computer.
  7. Do close out.

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