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Select color for CAS message that you wish to troubleshoot

(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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Quick Links

06/04/21

Message Overview:

R BATT FAIL
(Caution)

DDG Reference: None
Pilot Action (QRH): ELEC 04-4
System Description: 24-32-00
Schematic Diagram: 24-32-00
24-61-00
Wiring Diagram: 24-32-03
24-61-03

Message Description:

The amber 'R BATT FAIL' caution CAS message indicates either the respective battery has failed, the contactor for the battery has failed or the battery has been automatically isolated.

The battery is monitored by the respective side DCPC. The battery will be disconnected and the EICAS Caution R BATT FAIL message displayed if the following conditions are detected:

  • Overheat Detection (Battery temperature > 65°C and aircraft not in emergency operation)
  • Battery Reverse Current Detection Protection Threshold 150 amps for 80 seconds.
  • Battery Over-load detection Protection Threshold Time delay Effect Overload 600A ±20 A < 50 ms (ie short circuit on ESS bus).
    NOTE: This signal is inhibited during an APU start.

Possible Causes:

  • Electrical System Component(s)
  • Right Battery (RBATT) (BT2)
  • Right DC Power-Center Primary-Logic (RLOG) (PCB4)
  • Right DC Power-Center Protection (RPROT) (PCB2)
  • Right DCPC Battery-Diode PCB
  • Right Battery Current Thermal Sensor (MPE074)
  • Right DC Power-Center L DCPC ESS BUS 5 Amp Circuit Breaker
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-24-0141 - Electrical System and Flight Display Issues During Flight

Forum Articles/Infoservice/Newsletter: None

NOTE: Check Right DC Power-Center (R DCPC) (A36) L DCPC ESS BUS 5 Amp Circuit Breaker (CB6−C1) first.

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
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 Current Thermal Sensor AMM 24-61-51-000-801
Installation of the Current Thermal Sensor AMM 24-61-51-400-801
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 DCPC Battery-Diode Printed-Circuit-Board (PCB) AMM 24-61-82-000-801
Installation of the DCPC Battery-Diode Printed-Circuit-Board (PCB) AMM 24-61-82-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Interrogate the MDC as follows:

    1. On the cursor control panel, ensure the toggle switch is to the right and select Anti-Ice, ECS and Fuel buttons simultaneously. The MDC main menu should now be displayed on Display Unit #3.
    2. Using the joystick, select Current Faults (if the fault is active) or Aircraft History to research stored faults. From Aircraft History you can then select Fault Message History and locate the fault. Going into advanced diagnostics will provide an equation id for the fault identified.
    3. Select the MDC fault or equation from the drop down below to provide additional information to assist in troubleshooting.

  2. Interchange Right Battery (BT2) with Left Battery (BT1). Is the fault still present?

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

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

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

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

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

  5. Interchange Right BATT DIODE PCB with Left BATT DIODE PCB. Is the fault still present?

    1. If YES, continue with next step.
    2. If NO, replace defective BATT DIODE PCB.

  6. Interchange Right BATT Current Thermal Sensor (MPE074) with Left BATT Current Thermal Sensor (MPE073). Is the fault still present?

    1. If YES, continue with next step.
    2. If NO, replace defective BATT Current Thermal Sensor.

  7. Replace Right DC Power Center (A36).
  8. Do close out.

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