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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:

B3-007688

Associated CAS:

ELECTRICAL FAULT
(Caution)

L MAIN BUS FAIL
(Caution)

R GEN FAIL
(Caution)

R MAIN BUS FAIL
(Caution)

ELECTRICAL FAULT
(Advisory)

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

Message Description:

The Right Bus Tie Contactor (RBTC) has failed.

Possible Causes:

  • Right Bus Tie Contactor (RBTC) (K80)
  • Right DC Power-Center Primary-Logic (RLOG) (PCB4)
  • Left DC Power-Center Primary-Logic (LLOG) (PCB3)
  • Right Battery-Diode Printed-Circuit-Board (PCB22)
  • Right DC Power Center (RDCPC) (A36)
  • 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 Bus Tie Contactor AMM 24-61-29-000-801
Installation of the Bus Tie Contactor AMM 24-61-29-400-801
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 Right Bus Tie Contactor (K80) connector and the Right DCPC Battery-Diode PCB (PCB22) located in the Right DC Power Center (A36). Do visual inspection of the connectors 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 7.

  2. Verify Right Bus Tie Contactor (K80) 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 satisfying, continue with next step.
    2. If the verification is not satisfying, replace the defective Bus Tie 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 Right DC Power-Center Primary-Logic (PCB4) and on the Left DC Power-Center Primary-Logic (PCB3).

  3. Interchange the Right Bus Tie Contactor (K80) with the Left Bus Tie Contactor (K79). Is the fault message still present?

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

  4. Interchange the Right DC Power-Center Primary-Logic (PCB4) with the Left DC Power-Center Primary-Logic (PCB3). 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 Right DCPC Battery-Diode PCB (PCB22) with the Left DCPC Battery-Diode PCB (PCB21). Is the fault message still present?

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

  6. Do wiring check between the Right DC Power Center (A36) and Left DC Power Center (A35) as per the following table. Repair wiring as required. Is the fault message still present?

    From To Results
    RDCPC Conn. A36P2 pin C LDCPC Conn. A35P2 pin C
    RDCPC Conn. A36P2 pin m LDCPC Conn. A35P2 pin m
    RDCPC Conn. A36P2 pin v LDCPC Conn. A35P2 pin v

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

  7. Replace Right DC Power Center (A36). Is the fault message still present?

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

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

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