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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:

FAULT

Message Code:

B3-007018

Associated CAS:

L BATT OVERHEAT
(Warning)

ELECTRICAL FAULT
(Caution)

L BATT FAIL
(Caution)

Reporting LRU: L BAT CNTOR
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 Battery Contactor (LBATC) has failed.

Possible Causes:

  • Left Battery Contactor (LBATC) (K73)
  • Left DC Power-Center Primary-Logic (LLOG) (PCB3)
  • Left DCPC Battery-Diode Printed-Circuit Board (PCB21)
  • Left DC Power Center (LDCPC) (A35)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-24-0024 - Electrical System - Troubleshooting Tips
  • AW300-24-0137 - Y06 Electrical System Upgrade
  • AW300-24-0162 - Service Bulletin 100-24-20 - DC Power Center (DCPC) System - Inspection and Replacement of Internal Fuses in the L/H and R/H DC Power Center (DCPC)

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Power Center (DCPC) AMM 24-61-01-000-801
Installation of the Power Center (DCPC) AMM 24-61-01-400-801
Removal of the Battery Contactor AMM 24-61-05-000-801
Installation of the Battery Contactor AMM 24-61-05-400-801
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 DCPC Battery-Diode Printed-Circuit Board AMM 24-61-82-000-801
Installation of the DCPC Battery-Diode Printed-Circuit Board AMM 24-61-82-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Disconnect the Left Battery Contactor (K73) connector and the Left DCPC Battery-Diode Printed-Circuit Board (PCB21) connector located in the Left DC Power Center (A35). Do visual inspection of the connectors and associated wiring for any loose pins and/or damaged wire.

    1. If inspection is satisfactory, continue with next step.
    2. If inspection is not satisfactory, replace Left DCPC (A35).

  2. Verify Left Battery Contactor (K73) coils by measuring the resistances at the contactor connector (J-side) as per the following table:

    Coils Expected Values Results
    (Pick-up) Pin 1 and Pin 2 between 4.5 Ω and 6.5 Ω
    (Hold) Pin 2 and Pin 3 between 260 Ω and 280 Ω

    1. If the verification is satisfactory, continue with next step.
    2. If the verification is not satisfactory, replace the defective Battery Contactor.
      NOTE: It is important to not skip this verification before proceeding with the interchange at step 3. A short of one of the 2 coils will result with a blowing of a fuse on the Left DC Power-Center Primary-Logic (PCB3).

  3. Interchange the Left Battery Contactor (K73) with the Right Battery Contactor (K74). Is the fault message still present?

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

  4. Interchange 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 defective DC Power-Center Primary-Logic.

  5. Interchange the Left DCPC Battery-Diode Printed-Circuit Board (PCB21) with the Right DCPC Battery-Diode Printed-Circuit Board (PCB20). Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace the defective DCPC Battery-Diode Printed-Circuit Board.

  6. Replace Left DC Power Center (A35).
  7. Do close out.

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