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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 G/S MUTED FUNCTION FAIL

Message Code: 344OBS005
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: 31-43-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]
34-42-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

The Glideslope cancel function of the Ground Proximity Warning-System (GPWS) is not operational. The aural warning "GLIDESLOPE" continues after the G/S WARN MUTED Switch on the Enhanced Ground Proximity Warning-System (EGPWS) Control Panel is set to ON.

Possible Causes:

  • Enhanced Ground Proximity Warning-System (EGPWS) Control Panel (AP72)
  • Enhanced Ground Proximity Warning-System (EGPWS) (A64)
  • Data Acquisition Unit (DAU) 2 (A18)
  • Lamp Dimmer Power Supply (LDPS) 1 (A145)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter:

Normal operation of Flap override can be tested by going to the system diagnostics page and do the SELF TEST LEVEL 6 for the GPWS on PMAT (AMM TASK 45-45-00-970-804). The follows will happen:

  • "LANDING FLAPS" will be heard from the flight compartment speakers when FLAP OVRD switch is set to ON
  • "NOT LANDING FLAPS" will be heard when FLAP OVRD switch is set to OFF

Quick Links:

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 Lamp-Dimmer Power-Supply
System		 AMM 31-43-00-710-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Lamp-Dimmer Power Supplies AMM 31-43-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Lamp-Dimmer Power Supplies AMM 31-43-01-400-801 [ 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 ]
Removal of the EGPWS Control Panel AMM 34-42-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the EGPWS Control Panel AMM 34-42-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational Test of the EGPWS Control Panel AMM 34-42-05-710-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to System Diagnostics AMM 45-45-00-970-804 [ 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 DAU 2 to get access to the connector A18AP1, electrical connector A145P1 from the lamp-dimmer power supply 1, EGPWS control panel connector (AP72P1) and GPWS computer connector (A64BP1). Perform a continuity check between the connectors that follows:

    From To Result
    AP72P1-S A145P1-C
    AP72P1-T GS706
    AP72P1-H A18AP1-A7
    AP72P1-L A64BP1-D9

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

  2. Install the DAU 2 and perform the operational test.

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

  3. Connect the disconnected electrical connector A145P1 to the lamp-dimmer power supply 1. Perform the operational test of the lamp-dimmer power supply 1.

    1. If the operational test are not satisfactory, perform troubleshooting for Panel Integral Lighting and do close out.
    2. If the operational test are satisfactory, continue with next step.

  4. Connect the disconnected connector A64BP1 and perform the operational test of the GPWS computer.

    1. If the operational test are not satisfactory, perform the troubleshooting for CAS message GPWS SYSTEMS FAIL and do close out.
    2. If the operational test are satisfactory, continue with next step.

  5. Replace EGPWS control panel.
  6. Do close out.

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