ASN Wikibase Occurrence # 133725
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| Date: | Wednesday 30 September 1998 |
| Time: | 10:45 LT |
| Type: | Mayala DRAGONFLY |
| Owner/operator: | Private |
| Registration: | N4478V |
| MSN: | 437 |
| Total airframe hrs: | 988 hours |
| Engine model: | Volkswagen |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Avon, MT -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Helena, MT (KHLN) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot-in-command/owner of the homebuilt Volkswagen-engine powered Dragonfly departed Helena, Montana, uneventfully. After approximately 30 minutes of flight he observed the engine oil pressure decrease to zero in less than two minutes with a concurrent increase in oil temperature. He then executed a forced landing in a rough pasture during which the aircraft bounced and then cartwheeled. Post-crash examination revealed oil on the aircraft's firewall and underside. Further examination revealed that the engine rear crankshaft seal was deformed and the neoprene gasket was missing.
Probable Cause: Failure of the engine crankshaft aft oil seal resulting in the loss of engine oil, and rough terrain during the forced landing.
Accident investigation:
 |
|
Sources:
NTSB SEA98LA192
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 06-Apr-2024 06:00 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Departure airport, Source, Narrative, Plane category, Category, Accident report] |
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