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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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For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

04/07/21

Message Overview:

Message Name:

INTERNAL CLOCK FAIL

Message Code:

B3-007151

Associated CAS:

None

Reporting LRU: MDC
System Description: 45-00-00
Schematic Diagram: 45-45-00
Wiring Diagram: 45-45-01

Message Description:

Maintenance Diagnostic Computer (MDC) has detected an internal clock failure.

Possible Causes:

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

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

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
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset R IAPS Circuit Breaker CB2-B6. Is the fault message still present?

    1. If NO, do close out.
    2. If YES, replace MDC.

  2. Do close out.

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