Investigation Report
EC175B Accessory Gearbox Bearing Failure During Post-Maintenance Ground Run
Airbus Helicopters EC175-B, G-EMEB 06-21
- AAIB
- Investigation Report
- Mechanical failure
- Helicopter operationsInspection and maintenance
- HelicopterRotating machinery
- Operating and work proceduresRisk assessment
- Onshore facility
Summary
An AAIB investigation examines an EC175B accessory gearbox bearing failure during a post-maintenance ground run at Aberdeen Airport. Excess grease and trapped air imposed excessive axial loading during alternator installation. Manufacturer testing informed revised maintenance instructions covering grease removal and V-band clamping. A subsequent similar event is also discussed.
Classifications: Mechanical failure; equipment failure.
Classifications: Helicopter operations; offshore aviation; rotary-wing operations.
Classifications: Inspection and maintenance; asset inspection; equipment maintenance.
Classifications: Helicopter; rotorcraft.
Classifications: Rotating machinery; rotating equipment.
Classifications: Operating and work procedures.
Classifications: Risk assessment; hazard assessment.
Classifications: Onshore facility; onshore plant.