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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 BATTERY FAIL
(Service Message)

Message Code:

B3-007153

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 a Low/failed battery situation.

Possible Causes:

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

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter:

The MDC internal Battery is used to keep Non-Volatile Memory and real time clocks active when power is off. When this service message is posted, even if the MDC is still operating as expected, we recommended to replace it as soon as possible to reduce the possibility of a MDC failure at power-up.

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
Discard of the Maintenance Diagnostic Computer (MDC) Battery AMM 45-45-01-960-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Discard the Maintenance Diagnostic Computer (MDC) Battery.
  2. Do close out.

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