ELECTRICAL FAULT
(Advisory)

The cyan 'ELECTRICAL FAULT' advisory CAS message indicates an electrical system fault has occurred that causes the loss of redundancy in the display of electrical indications.

• Electrical System Component(s)
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW300-24-0023 - Nuisance "ELECTRICAL FAULT" CAS Message During APU Start
• AW300-24-0024 - Electrical System - Troubleshooting Tips
• AW300-24-0038 - Nuisance "ELECTRICAL FAULT" CAS Message Upon Engine or APU Shut Down.
• AW300-24-0073 - SB100-24-08 - Modification of DC Power Center (DCPC) - System Reactivation.
• AW300-24-0085 - DC Generator Shaft Spline Wear/Corrosion
• AW300-24-0141 - Electrical System and Flight Display Issues During Flight
• AW300-24-0326 - Generator Control Unit PN R3608-005

Forum Articles/Infoservice/Newsletter: None

NOTE:

• If during engine start a cyan 'ELECTRICAL FAULT' advisory CAS is posted and the MDC shows Fault Code B3-007087, swap the GEN GCUs and monitor if condition follows the GCU.

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.
      Select an MDC Fault Code/Message:B3-006292 - FAULT [APU GEN GCU]B3-006293 - FAULT [APU GEN PWR MDL]B3-006656 - DPMS1/LPROT/WIRING FAULT [DIFF PROT SNSR 1]B3-006657 - DPMS2/RPROT/WIRING FAULT [DIFF PROT SNSR 2]B3-006658 - DPMS5/APU LOG/WIRE FAULT [DIFF PROT SNSR 5]B3-006659 - DPMS7 OR WIRING FAULT [DIFF PROT SNSR 7]B3-006668 - FAULT [EXT DC CNTOR]B3-007013 - FAULT [L APU GEN CNTOR1]B3-007014 - FAULT [L AUX BUS CNTOR]B3-007019 - FAULT [L BUS TIE CNTOR]B3-007071 - FAULT [L ESS CNTOR]B3-007105 - L LOGIC/LBTC/RBTC FAULT [L LOGIC PCB]B3-007122 - FAULT [L PROTECTION PCB]B3-007676 - FAULT [R APU GEN CNTOR1]B3-007679 - FAULT [R AUX BUS CNTOR]B3-007688 - FAULT [R BUS TIE CNTOR]B3-007750 - FAULT [R ESS CNTOR]B3-007828 - R LOGIC/RBTC/LBTC FAULT [R LOGIC PCB]B3-007845 - FAULT [R PROTECTION PCB]B3-226907 - FAULT [APU LOGIC PCB]B3-226908 - DPMS8 OR WIRING FAULT [DIFF PROT SNSR 8]