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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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06/22/21

Message Overview:

Message Name:

TEL NOCOMM ON FMS CDU

Message Code: 232OBS005
Effectivity: All
System: Airborne Data Link System
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 ]

Message Description:

Airborne Data Link Unit (ADLU) sets 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 downlink message and all three attempts are unsuccessful
  • Three consecutive attempts to receive an uplink message have been made and all three attempts are unsuccessful

Possible Causes:

  • Airborne Data Link Unit (ADLU) (A239)
  • Telephony Modem
  • Cabin Communication System
  • 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:

Operational Test of the Data Link System AMM 23-23-00-710-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
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 ]
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.
    NOTE: Do the initialization of the Flight Management System (FMS). Deactivate SATCOM and VHF 3 systems by respective circuit breakers.
  2. Check if the terminal text weather information displayed?

    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.

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

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

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

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