Mayala DRAGONFLY N4478V
30 September 1998 · Avon, Montana, United States · Minor injuries
Summary
On 30 September 1998 at about 15:45 local time, a Mayala DRAGONFLY registered N4478V was involved in an accident near Avon, Montana, United States. One person was on board and one had minor injuries. The aircraft was destroyed. The NTSB has published a probable cause for this accident; it is quoted in full below.
The record
- Date
- at 15:45
- Classification
- Accident
- Location
- Avon, Montana, United States
- Coordinates
- 46.6507, -112.6006
- Aircraft
- Mayala DRAGONFLY
- Registration
- N4478V
- Category
- Airplane
- Engines
- 1
- Operator
- Not recorded
- Operating rule
- Part 91: General Aviation
- Purpose of flight
- Personal
- Phase of flight
- Not recorded
- Route
- Helena → Unknown
- Aircraft damage
- Destroyed
- Weather
- VMC
- Light
- Day
- NTSB number
- SEA98LA192
People
1 person had minor injuries.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 1 | 0 | 0 | 1 | 0 |
Probable cause
Failure of the engine crankshaft aft oil seal resulting in the loss of engine oil, and rough terrain during the forced landing.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
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.
Quoted verbatim from the NTSB record.
Other Mayala DRAGONFLY accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 25 Aug 1986 | Mayala DRAGONFLY | Helena, Montana, United States | Hjalmer A. Mayala | Serious injuries | - |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 6 Apr 1998 | Mooney M20F | Lodgepole, Montana, United States | - | Fatal | 1 |
| 19 May 1998 | Piper PA-31T1 | Great Falls, Montana, United States | - | Fatal | 2 |
| 7 Jun 1998 | Mooney M20A | Canyon Creek, Montana, United States | - | Fatal | 1 |
| 17 Jun 1998 | Aero Commander 680FL | Helena, Montana, United States | - | Fatal | 1 |
| 11 Apr 1998 | Piper PA-46-350P | Bigfork, Montana, United States | - | Fatal | 2 |
| 19 Jun 1998 | Cessna 340 | Lincoln, Montana, United States | Curtis M. Moeller | Fatal | 1 |