02/25/21
Message Overview:
Message Description:
The Right Generator Control Unit (RGCU) has failed.
Possible Causes:
- Right Generator Control Unit (RGCU) (PCB6)
- Right Generator Power Module (RGPM) (PCB8)
- Right Generator (RGEN) (G2)
- Right DC Power Center (RDCPC) (A36)
- Associated Wiring
Troubleshooting Tips:
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 MDC is reporting multiple GEN GCU fault messages simultaneously, accompanied by a Proximity Sensing Electronics Unit (PSEU) failure, most likely B3-007551 - PSEU SYSTEM FAILURE or B3-007550 - PSEU OFF/NO OUTPUT, the ATA 32 fault(s) must be addressed first.
NOTE: For troubleshooting purposes you may refer to the Generators Windings Values table.
Quick Links:
| Removal of the Main Generator | AMM 24-31-05-000-801 |
| Installation of the Main Generator | AMM 24-31-05-400-801 |
| Operational Test of the Main Generator | AMM 24-31-05-710-801 |
| Removal of the Generator Control Unit (GCU) - Primary | AMM 24-31-13-000-801 |
| Installation of the Generator Control Unit (GCU) - primary | AMM 24-31-13-400-801 |
| Removal of the Generator Power Module | AMM 24-31-21-000-801 |
| Installation of the Generator Power Module | AMM 24-31-21-400-801 |
| Removal of the DC Power Center (DCPC) | AMM 24-61-01-000-801 |
| Installation of the DC Power Center (DCPC) | AMM 24-61-01-400-801 |
| Functional Test of the DC Power Center (DCPC) | AMM 24-61-01-720-801 |
| Wiring - Maintenance Practices - ALL | SPM 20-12-00-02 |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 |
Troubleshooting Recommendations:
- Swap the Right Generator Control Unit (PCB6) with the Left Generator Control Unit (PCB5). Is the fault message still present?
- If YES, continue with next step.
- If NO, replace the defective Generator Control Unit.
NOTE: Whilst the card is removed, inspect the card contacts and make sure they are clean and free from contamination.
- Swap the Right Generator Power Module (PCB8) with the Left Generator Power Module (PCB7). Is the fault message still present?
- If YES, continue with next step.
- If NO, replace the defective Generator Power Module.
- Perform a wiring check between the right Generator (GEN 2) and the right DC Power Center (A36) as follows:
From To Results G2P1-A A36P1-F G2P1-B A36P-G G2P1-G A36P1-AA G2P1-D A36P1-H G2P-F A36P1-h G2P1-E A36P1-J G2P1-L A36P1-JJ G2P1-M A36P1-z G2P1-H A36P1-D G2P1-J A36P1-d G2P1-K A36P1-E - If wiring defects are found, repair defective wiring as required and do close out.
- If no defects are found, continue with next step.
- Swap the Right Generator (G2) with the Left Generator (G1). Is the fault message still present?
- If YES, continue with next step.
- If NO, replace the defective Generator.
- Replace Right DC Power Center (A36).
- Do close out.