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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:

MDC FAULT HISTORY LOSS

Identifier: 454OBS001
Effectivity: AIRCRAFT 20501 - 20999
System: Maintenance Diagnostics
Associated CAS: None
System Description: 45-45-00
Schematic Diagram: 45-45-00
Wiring Diagram: 45-45-01

Message Description:

MDC Fault History and Engine Trend and Exceedance history has been lost.

Possible Causes:

  • Maintenance Diagnostic Computer (MDC) (A4-MDC)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

The loss of Fault History and Engine Trend and Exceedance history has been reported from the field regarding operation of the MDC-3110 and MDC-4110 products. Engineering laboratory and field investigation by the RCI MDC team revealed that a short power cycle (~15 seconds) removed power from the MDC at a time when the file system software operation was performing a critical operation. In addition, file system blocks were being used after a test indicated the block was not ready for use.

  • Interim Action: Apply power to the avionics, specifically the IAPS, for a period of one or more minutes to avoid the condition described above.
  • Resolution: A change will be made to the MDC-3110/-4110 software to improve the operation of file system software during that critical operation, and reduce the loss of history data. The MDC software update is planned to be available on or before June 29, 2007.

Quick Links:

Removal of the Maintenance Diagnostic Computer (MDC) AMM 45-45-01-000-801
Installation of the Maintenance Diagnostic Computer (MDC) AMM 45-45-01-400-801
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. None

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