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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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Quick Links

05/06/21

Message Overview:

Message Name:

SHORT CIRCUIT

Message Code:

B3-269321

Associated CAS:

ELECTRICAL FAULT
(Caution)

L MAIN BUS FAIL
(Caution)

R GEN FAIL
(Caution)

R MAIN BUS FAIL
(Caution)

Reporting LRU: BUS TIE FEEDER
System Description: 24-61-00
Schematic Diagram: 24-61-00
Wiring Diagram: 24-61-01
24-61-03

Message Description:

A Bus Tie (BT) Feeder short-circuit has been reported by the Left DC Power Center or the Right DC Power Center.

Possible Causes:

  • Bus Tie Feeder
  • Left DC Power-Center Primary-Logic (LLOG) (PCB3)
  • Right DC Power-Center Primary-Logic (RLOG) (PCB4)
  • Left DC Power Center (LDCPC) (A35)
  • Right DC Power Center (RDCPC) (A36)
  • 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

Fault confirmation:Verify the data used to determine this fault message (by accessing the MDC Advanced Diagnostic page or by analyzing the MDC NVM files.

  • If bit 19 of LABEL 352 from the L PROT is set to 1, the L DCPC has reported the failure.
  • If bit 19 of LABEL 352 from the R PROT is set to 1, the R DCPC has reported the failure.

Quick Links:

Removal of DC Power Center (DCPC) AMM 24-61-01-000-801
Installation of 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
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. When the Hydraulic-Motor Driven Generator option is installed on Aircraft, the fault message B3-345657 can be also posted on the MDC.

    1. If present, proceed with the associated T/S procedure prior to continue with this one.
    2. If other faults related to ATA24 are posted on the MDC, proceed with the T/S procedure(s) for those failures prior to continue with this one.

  2. Inspect the Left DCPC (A35), external and internal, for any signs of burning and for the presence of any foreign object that could have caused a short circuit.

    1. If inspection is okay, continue with next step.
    2. If inspection is not okay, go to step 8.

  3. Inspect the Right DCPC (A36), external and internal, for any signs of burning and for the presence of any foreign object that could have caused a short circuit.

    1. If inspection is okay, continue with next step.
    2. If inspection is not okay, go to step 9.

  4. Do a visual inspection and a wiring check of the following cable:

    From
    		 To
    		 Results
    LDCPC STUD T7 RDCPC STUD T7

    1. If the results of the inspection and the wiring check are satisfying, go to next step.
    2. If the results of the inspection and the wiring check are not satisfying, repair defective wiring.

  5. Do the fault confirmation described in the Troubleshooting Tips: section above and note which DCPC has reported the failure.
  6. 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, do close out.

  7. Do the fault confirmation described above in the Troubleshooting Tips: section and note which DCPC has reported the failure.

    1. If same DCPC has reported the failure again, replace the defective DCPC.
    2. If other DCPC has reported the failure, replace the defective DC Power-Center Primary-Logic.

  8. Replace Left DC Power Center (A35). Is the fault message still present?

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

  9. Replace Right DC Power Center (A36).
  10. Do close out.

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