03/13/26
Message Overview:
Message Name:
INTERNAL FAULT
Message Code:
B3-007088
Associated CAS:
| Reporting LRU: | LEFT GENERATOR |
| System Description: | 24-31-00 - Primary DC Power System 24-61-00 - DC Power Center (DCPC) |
| Schematic Diagram: | SSM 24-31-00-101 - Primary DC-Power System SSM 24-61-00-101 - DC Power Center (DCPC) System |
| Wiring Diagram: | 24-31-05 - Main Generator (Left) - ALL 24-31-13 - Generator Control Unit (GCU) Left - ALL 24-61-01 - DC Power Center (DCPC) Left - ALL |
Message Description:
The Left Generator (LGEN) has failed.
Possible Causes:
- Left Generator (LGEN) (G1)
- Left Generator Control Unit (LGCU) (PCB5)
- Left Generator Power Module (LGPM) (PCB7)
- Left DC Power Center (LDCPC) (A35)
- 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.
Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None
Flight Operation Notifications Manual (FONM): None
NOTES:
Quick Links:
| General Setup for Maintenance | |
|---|---|
| Standard Aircraft Configuration for Maintenance | AMM 12-00-00-867-803 |
| Connect Electrical Power to the Aircraft | AMM 24-00-00-861-801 |
| Remove Electrical Power from the Aircraft | AMM 24-00-00-861-802 |
| Electrical/Electronic Safety Precautions | AMM 24-00-00-910-801 |
| Electrostatic Discharge Safety Precautions | AMM 24-00-00-910-802 |
| Maintenance Tasks | |
| Removal of the Main Generator | AMM 24-31-05-000-801 |
| Installation of the Main Generator | AMM 24-31-05-400-801 |
| 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 |
Troubleshooting Recommendations:
- Inspect the Generator Cooling Inlet and Outlet on the engine cowling for obstruction or debris.
- Verify that the Generator electrical connections are secured and in good condition.
- Spin the Left Generator (G1) shaft by hand through the opening of the cooling ports. Does it spin freely?
- If YES (the shaft is sheared), replace the defective Generator.
- If NO (some friction could be felt), continues with next step.
- Do wiring check of the following wires:
From To Results L GEN conn. G1P1 - pin A L DCPC conn. A35P1 - pin F L GEN conn. G1P1 - pin B L DCPC conn. A35P1 - pin G L GEN conn. G1P1 - pin G L DCPC conn. A35P1 - pin AA L GEN conn. G1P1 - pin D L DCPC conn. A35P1 - pin H L GEN conn. G1P1 - pin F L DCPC conn. A35P1 - pin h L GEN conn. G1P1 - pin E L DCPC conn. A35P1 - pin J L GEN conn. G1P1 - pin L L DCPC conn. A35P1 - pin JJ L GEN conn. G1P1 - pin M L DCPC conn. A35P1 - pin z L GEN conn. G1P1 - pin H L DCPC conn. A35P1 - pin D L GEN conn. G1P1 - pin J L DCPC conn. A35P1 - pin d L GEN conn. G1P1 - pin K L DCPC conn. A35P1 - pin E - If wiring check is satisfying, continue with next step.
- If wiring check is not satisfying, repair the defective wire.
- Interchange the Left Generator (G1) with the Right Generator (G2). Is the fault message still present?
- If YES, continue with next step.
- If NO, replace the defective Generator.
- Interchange the Left Generator Control Unit (PCB5) with the Right Generator Control Unit (PCB6). Is the fault message still present?
- If YES, continue with next step.
- If NO, replace the defective Generator Control Unit.
- Interchange the Left Generator Power Module (PCB7) with the Right Generator Power Module (PCB8). Is the fault message still present?
- If YES, continue with next step.
- If NO, replace the defective Generator Power Module.
- Replace Left DC Power Center (A35).
- Do close out.