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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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05/06/21

Message Overview:

Message Name:

MCS4 OR RPROT PCB FAULT

Message Code:

B3-007149

Associated CAS:

ELECTRICAL FAULT
(Caution)

ELECTRICAL FAULT
(Advisory)

Reporting LRU: RBAT CUR SNSR4
System Description: 24-32-00
24-61-00
Schematic Diagram: 24-32-00
24-61-00
Wiring Diagram: 24-32-03
24-61-03

Message Description:

A failure with the Right Battery Monitoring Sensor or the Right Protection PCB has been reported by the Right DC Power Center.

Possible Causes:

  • Right Battery Sensor (MCS4) (MPE074)
  • Right DC Power-Center Protection (RPROT) (PCB2)
  • Right DC Power Center (RDCPC) (A36)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the DC Power Center (DCPC) AMM 24-61-01-000-801
Installation of the DC Power Center (DCPC) AMM 24-61-01-400-801
Functional Test of the DC Power Center (DCPC) AMM 24-61-01-720-801
Removal of the Battery Sensor AMM 24-61-45-000-801
Installation of the Battery Sensor AMM 24-61-45-400-801
Removal of the DC Power-Center Protection AMM 24-61-77-000-801
Installation of the DC Power-Center Protection AMM 24-61-77-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Disconnect the Right Battery Sensor (MPE074) connector located in the Right DC Power Center (A36). Do visual inspection of the connector and associated wiring for any loose pins and/or damaged wire.

    1. If inspection is satisfying, continue with next step.
    2. If inspection is not satisfying, go to step 4.

  2. Interchange Right Battery Sensor (MPE074) with the Left Battery Sensor (MPE073). Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace the defective Battery Sensor.

  3. Interchange the Right Power-Center Protection (PCB2) with the Left DC Power-Center Protection (PCB1). Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace the defective DC Power-Center Protection.

  4. Replace Right DC Power-Center (A36).
  5. Do close out.

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