APU GEN FAIL
(Caution)

The APU Generator has failed.

The amber 'APU GEN FAIL' caution CAS message will be posted when the following conditions occurs:

• APU SW is not turned OFF and APU On-Speed Mode Ready for Gener.
  AND;
• APU GEN is not producing voltage between 24V & 31.5V
  
  OR;
• Left APU CONTACTOR and Right APU CONTACTOR are not closed
  AND;
• Aircraft is not WOW
  
  OR;
• EXTERNAL DC CONTACTOR is not closed.

• Aircraft system failure
• Electrical System component(s)
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW300-24-0073 - SB100-24-08 - Modification of DC Power Center (DCPC) - System Reactivation
• AW300-24-0085 - DC Generator Shaft Spline Wear/Corrosion
• AW300-24-0326 - Generator Control Unit PN R3608-005

Forum Articles/Infoservice/Newsletter: None

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]B3-006345 - INTERNAL FAULT [APU GENERATOR]B3-006658 - DPMS5/APU LOG/WIRE FAULT [DIFF PROT SNSR 5]B3-006659 - DPMS7 OR WIRING FAULT [DIFF PROT SNSR 7]B3-007013 - FAULT [L APU GEN CNTOR1]B3-007676 - FAULT [R APU GEN CNTOR1]B3-226907 - FAULT [APU LOGIC PCB]B3-226908 - DPMS8 OR WIRING FAULT [DIFF PROT SNSR 8]B3-226909 - FAULT [L APU GEN CNTOR2]B3-226910 - FAULT [R APU GEN CNTOR2]