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(WARNING)
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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

06/14/19

Message Overview:

Fault Message:

ADLU TELEPHONY MODEM FAULT

Fault Code:

2320007TDY

Associated CAS:

None

Reporting LRU: Airborne Data-Link Unit
System Description: 23-23-00
Schematic Diagram: 23-23-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 23-23-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]
23-23-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

Airborne Data-Link Unit (ADLU) sets Telephony Communication (TEL NOCOMM) message when:

  • Three attempts are made to establish a telephony link and all three attempts are unsuccessful. This could be the result of the phone line being busy, the ground not answering, being between the cells in which case the Airborne Phone System could not establish connection etc.
  • Three consecutive attempts are made to transfer the down link message and all three attempts are unsuccessful
  • Three consecutive attempts to receive an up link message have been made and all three attempts are unsuccessful

Possible Causes:

  • Airborne Data-Link Unit (ADLU) (A239)
  • Cabin Distribution Bus Repeater 2 (A244)
  • Telephony Modem
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

No connection can be made with the Telephony Modem. This fault is set when Telephony Modem access fails and cleared when Telephony Modem access succeeds. Make sure that Cabin Communication System is operative before proceeding with troubleshooting.

Quick Links:

Removal of the Airborne Data-Link Unit AMM 23-23-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Airborne Data-Link Unit AMM 23-23-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Initialization of the Flight Management System (FMS) AMM 34-61-00-840-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Operate the Airborne Data-Link System using Airborne Telephony to receive the terminal text weather information. If its displayed?
    NOTE: Do the initialization of the Flight Management System (FMS). Deactivate SATCOM and VHF 3 systems by respective circuit breakers.

    1. If YES, Verify that CAIMS fault code 2320007TDY "ADLU TELEPHONY MODEM FAULT" is not displayed on PMAT and do close out.
    2. If NO, continue with next step.

  2. Perform a wiring check, short to ground and pin/socket retention check between the ADLU connector A239BP1 and the CDBR-2 connector A244P5.Is it satisfactory?

    1. If NO, repair or replace the defective wiring as required per WM 20-12 and do close out.
    2. If YES, continue with next step.

  3. Replace the Airborne Data-Link Unit (ADLU) (ADLU TELEPHONY MODEM FAULT is faulty).
  4. Do close out.

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