ASN Wikibase Occurrence # 215830
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| Date: | Thursday 1 May 1986 |
| Time: | 13:45 |
| Type: |  Hughes 269C |
| Owner/operator: | |
| Registration: | VH-THY |
| MSN: | |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Location: | 5km E of Theda Station, WA -
 Australia
|
| Phase: | Landing |
| Nature: | Agricultural |
| Departure airport: | Theda Station, WA |
| Theda Station, WA | |
| Investigating agency: | BASI |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was engaged in mustering operations and was attempting transition from a low forward speed to an out of ground effect hover in order to turn a breakaway herd number. As he approached the hover, the helicopter experienced a sudden partial power failure. The pilot maintained the aircraft heading, lowered the collective lever and attempted to gain some forward airspeed. In the attempted landing with partial power, the helicopter struck the ground heavily and its main rotor blades hit a small sapling. The forced landing was made in light downwind conditions. Investigation revealed that the No 2 cylinder exhaust valve had failed in fatigue and the valve seat and retaining cap had failed in overload. Further testing indicated that the exhaust valve had been subjected to higher than normal operating temperatures which would have contributed to the premature failure of the valve.
Accident investigation:
 |
|
Sources:
https://www.atsb.gov.au/publications/investigation_reports/1986/aair/aair198600137/
https://www.atsb.gov.au/media/31125/aair198600137.pdf
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 30-Sep-2018 07:13 | Pineapple | Added |
Corrections or additions? ... Edit this accident description
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