Message Name:

DPMS2/RPROT/WIRING FAULT

Message Code:

B3-006657

Associated CAS:

ELECTRICAL FAULT
(Caution)

R GEN FAIL
(Caution)

ELECTRICAL FAULT
(Advisory)

The Right Generator Sensor has detected a current imbalance between the 2 feeders.

A failure with the Right Generator Sensor or Right Protection PCB has been reported by the Right DCPC.

• Right Generator power feeders terminal lugs corroded / Oxidized and / or under torqued at right generator or right DCPC
• Right Generator Sensor (DPMS2 or MPE072)
• Right DC Power-Center Protection (RPROT) (PCB2)
• Right DC Power Center (RDCPC) (A36)
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW300-24-0024 - Electrical System - Troubleshooting Tips: 

• AW300-24-0034 - "ELECTRICAL FAULT" CAS Message When External Power is Connected

• AW300-24-0137 - Y06 Electrical System Upgrade

• AW300-24-0289 - Generator failures during APU start 

Forum Articles/Infoservice/Newsletter: None

NOTE:

• If all or any combination of the following MDC faults are posted at the same time, troubleshoot the MDC Fault B3-006657 first.  
  B3-007087 - FAULT [L GEN GCU]
  B3-006292 - FAULT [APU GEN GCU]
  B3-006657 - DPMS2/RPROT/WIRING FAULT [DIFF PROT SNSR

1. Do visual inspection of the feeder cables between the Right Generator G2 positive terminal block and the Right DC Power-Center T11 and T12 Studs.

   1. If inspection is satisfying, continue with next step.
   2. If inspection and wiring check are not satisfying, repair/replace defective wiring as required.

2. Make sure the Right Generator power feeder cables terminal lugs are free of any corrosion / oxidation at Right DC Power-Center T11 and T12 Studs and Right generator positive terminal stud.

   1. If inspection is satisfying, continue with next step.
   2. If inspection is not satisfying, clean affected terminal lugs as per best maintenance practices.

3. Make sure the right generator positive stud hardware stack up is installed and torqued as per AMM's generator installation task 24-31-05-400-801.

   1. If inspection is satisfying, continue with next step.
   2. If inspection is not satisfying, reinstall the right generator positive terminal stud hardware stack up as per AMM's generator installation task

4. Make sure the Right DC Power-Center terminal studs T11 and T12 hardware is installed and torqued as per AMM TASK 24-61-77-400-801

   1. If inspection is satisfying, continue with next step.
   2. If inspection is not satisfying, torque the Right DC Power-Center studs T11 and T12 hardware as per specs
      NOTE: At the operator's discretion, a Generator Load Test can be performed to ensure the generator functionality under heavy output load. Refer to RIL BD-0069.

5. Disconnect the Right Generator Sensor (DPMS2) connector. Do visual inspection of the connector 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 5.

6. Swap Right Generator Sensor (DPMS2) with the Left Generator Sensor (DPMS1). Is the fault message still present?

   1. If YES, continue with next step.
   2. If NO, replace the defective Generator Sensor.

7. Swap the Right DC Power-Center Protection (PCB2) with the Left 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 Protection.

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