Summary
Circumstances:
During a practice low level circuit, the engine failed, accompanied by a loud bang. During the subsequent forced landing, the helicopter rolled on to its right side. Later examination of the engine revealed that the number three connecting rod had failed at the crankshaft and pierced the crankcase. The connecting rod showed signs of metal fatigue. However, no manufacturing defects were identified near the fracture surface nor was any assembly-related fault established. This accident was not the subject of an on-scene investigation.
Significant Factors:
The following factors were considered relevant to the development of the accident:
1. Engine failure as a result of a broken connecting rod.
2. The connecting rod failed from metal fatigue for reasons which were not determined.
Occurrence summary
| Investigation number | 198903828 |
|---|---|
| Occurrence date | 29/12/1989 |
| Location | Bribie Island |
| State | Queensland |
| Report release date | 10/05/1990 |
| Report status | Final |
| Investigation type | Occurrence Investigation |
| Investigation status | Completed |
| Mode of transport | Aviation |
| Occurrence class | Accident |
| Highest injury level | None |
Aircraft details
| Manufacturer | Hiller Aviation |
|---|---|
| Model | UH-12 |
| Registration | VH-FBH |
| Serial number | 5081 |
| Sector | Helicopter |
| Operation type | Private |
| Departure point | Caloundra QLD |
| Destination | Caloundra QLD |
| Damage | Substantial |