Message Name:

R LOGIC/RBTC/LBTC FAULT

Message Code:

B3-007828

Associated CAS:

ELECTRICAL FAULT
(Caution)

ELECTRICAL FAULT
(Advisory)

The Right DC Power-Center Primary-Logic has failed.

• Left Bus Tie Contactor (LBTC) (K79)
• Right DC Power-Center Primary-Logic (RLOG) (PCB4)
• Right DC Power-Center Protection (RPROT) (PCB2)
• Right Auxiliary Bus Contactor (RAUXC) (K76)
• Right Battery Contactor (RBATC) (K74)
• Right Bus Tie Contactor (RBTC) (K80)
• Right Essential Bus Contactor (RESSC) (K78)
• Right DC Power Center (RDCPC) (A36)
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW300-24-0013 - Loss of Normal Electrical Power
• AW300-24-0038 - Nuisance "ELECTRICAL FAULT" CAS Message Upon Engine or APU Shut Down
• AW300-24-0115 - Introduction of Improved Generator P/N A3579-102
• AW300-24-0132 - Power Module (PMOD) P/N R3608-011 - Generator Failures at High Engine Speed
• 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

NOTE: If the Aircraft is energized by the External power while both batteries are disconnected, this MDC Fault message will appear. Return the Aircraft to the normal configuration prior to continuing with this procedure.

1. Check on the EICAS if one of the following messages is posted.
   Select an CAS Message:APU GEN FAILL GEN FAILR GEN FAIL
   

   1. If one or many CAS messages are present, continue with the associated troubleshooting procedures.
   2. If none are present, continue with next step.

2. Check in the MDC if one of the following faults is logged in the current faults page or in the fault history page.
   Select an MDC Fault Message:B3-007019 - FAULT [L BUS TIE CNTOR]B3-007679 - FAULT [R AUX BUS CNTOR]B3-007687 - FAULT [R BAT CNTOR]B3-007688 - FAULT [R BUS TIE CNTOR]B3-007750 - FAULT [R ESS CNTOR]
   

   1. If one or many faults are present, continue with the associated troubleshooting procedures.
   2. If none are present, continue with next step.

3. 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.

4. Swap the Right DC Power-Center Protection (PCB2) with the Left DC Power-Center Protection (PCB1). 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. Replace Right DC Power Center (A36).
6. Do close out.