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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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04/26/21

Message Overview:

Message Name:

FMS CDU UNRESPONSIVE

Identifier: 346OBS004
Effectivity: AIRCRAFT 20501 - 20999
System: Navigation
System Description: 34-61-00
Schematic Diagram: 34-61-00
Wiring Diagram: 34-61-11

Message Description:

Flight Management System (FMS) Control Display Unit (CDU) has become unresponsive.

Possible Causes:

  • Flight Management Computer (FMC-6200)

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

NOTE: The Flight Management System (FMS) Control Display Unit (CDU) may become unresponsive when accepting changes from Air Traffic Control (ATC) through the Controller Pilot Data Link Communications (CPDLC) data feed.

Quick Links:

Removal of the Control Display Unit (CDU) AMM 34-61-05-000-801
Installation of the Control Display Unit (CDU) AMM 34-61-05-400-801
Operational Test of the Control Display Unit (CDU) AMM 34-61-05-710-801

Troubleshooting Recommendations:

  1. Review the content of AW300-23-0344.
  2. Make sure crew are aware of the mitigation measures described in the AW to prevent the issue or unlock the FMS if needed.
  3. If the condition on the aircraft does not apply to the condition described in the AW, you may interchange the affected FMS CDU with the other FMS CDU to confirm faulty unit and replace if required.
  4. Do close out.

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