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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 COMPUTER LOCK-UP CONDITIONS

Identifier: 454OBS002
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 Computer temporary Lock-up.

The MDC can experience a temporary lock-up condition when the user attempts to view the electronic part numbers using the LRU SW Part Number Data function accessed from the Configuration Data page. This function reports the electronic part numbers from LRUs containing field loadable software. When the lock-up condition is present, the user will see the MFD display "No Data Available" soon after the operation is attempted. The remainder of the MDC functions will not be affected by the lock-up condition.

Possible Causes:

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

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

The MDC can experience a temporary lock-up condition when the user attempts to view the electronic part numbers using the LRU SW Part Number Data function accessed from the Configuration Data page. This function reports the electronic part numbers from LRUs containing field loadable software. When the lock-up condition is present, the user will see the MFD display "No Data Available" soon after the operation is attempted. The remainder of the MDC functions will not be affected by the lock-up condition

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. See SIL 523-0817800-001000 for troubleshooting.

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