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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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02/25/21

Message Overview:

Message Name:

LBATT OR LPROT PCB FAULT

Message Code:

B3-007017

Associated CAS:

L BATT FAIL
(Caution)

ELECTRICAL FAULT
(Advisory)

Reporting LRU: LEFT BATTERY
System Description: 24-32-00
24-61-00
Schematic Diagram: 24-32-00
24-61-00
Wiring Diagram: 24-32-01
24-61-01

Message Description:

The Left DC Power-Center Protection has reported a failure with the Left Battery or the Left DC Power-Center Protection.

Possible Causes:

  • Left Battery (LBAT) (BT1)
  • Left DC Power-Center Protection (LPROT) (PCB1)
  • Left DC Power-Center Primary-Logic (LLOG) (PCB3)
  • Left Power Center (LDCPC) (A35)
  • Remote Data Concentrator (RDC) (A13)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Battery AMM 24-32-01-000-801
Installation of the Battery AMM 24-32-01-400-801
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
Removal of the DC Power-Center Primary-Logic AMM 24-61-73-000-801
Installation of the DC Power-Center Primary-Logic AMM 24-61-73-400-801
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
Removal of the Remote Data Concentrator (RDC) AMM 31-41-05-000-802
Installation of the Remote Data Concentrator (RDC) AMM 31-41-05-400-802
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

Troubleshooting Recommendations:

  1. Confirm the Left DC Power-Center Protection (PCB1) is correctly seated in place. Re-install as required. Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, do close out.

  2. Measure at the Left DC Power Center connector A35P2 (between w and d) the resistance of the Left Battery temp sensor T1.

    1. If the resistance is between 41.8Ω and 160kΩ, go to step 6.
    2. If the resistance is not between 41.8Ω and 160kΩ, continue with the next step.

  3. Measure at the Remote Data Concentrator connector A13AP1 (between 13E and 13F) the resistance of the Left Battery temp sensor T2.

    1. If the resistance is between 41.8Ω and 160kΩ, go to step 6.
    2. If the resistance is not between 41.8Ω and 160kΩ, continue with the next step.

  4. Do wiring check of the following wires:

    From To Results
    L BAT conn. B1P2 - pin A L DCPC conn. A35P2 - pin w
    L BAT conn. B1P2 - pin B L DCPC conn. A35P2 - pin d
    L BAT conn. B1P2 - pin C RDC conn. A13AP1 - pin 13E
    L BAT conn. B1P2 - pin D RDC conn. A13AP1 - pin 13E

    1. If wiring check is satisfying, continue with next step.
    2. If wiring check is not satisfying, repair the defective wire.

  5. Swap the Left Battery (BT1) with the Right Battery (BT2). Is the fault message still present?

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

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

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

  7. Swap the Left DC Power-Center Primary-Logic (PCB3) with the Right DC Power-Center Primary-Logic (PCB4). Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace the Power-Center Primary-Logic.

  8. Replace the Remote Data Concentrator (A13). Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace the Remote Data Concentrator.

  9. Replace Left DC Power Center (A35).
  10. Do close out.

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