ASN Wikibase Occurrence # 189056
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| Date: | Wednesday 3 August 2016 |
| Time: | 11:55 |
| Type: |  Sonex Waiex |
| Owner/operator: | Sonex Ltd |
| Registration: | N12YX |
| MSN: | 0001 |
| Year of manufacture: | 2003 |
| Total airframe hrs: | 304 hours |
| Engine model: | AMA/EXPR AeroVee |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Fond Du Lac County Airport (KFLD), Fond du Lac, WI -
 United States of America
|
| Phase: | Take off |
| Nature: | Training |
| Departure airport: | Fond Du Lac, WI (FLD) |
| Oshkosh, WI (OSH) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Shortly after takeoff on an instructional flight, the pilots heard a sudden change in engine noise. The instructor scanned the engine instruments and observed that the engine rpm was lower than expected. The instructor took control of the airplane and attempted to return to the airport. The airplane was not able to maintain altitude, and the instructor could not restore engine power to full. Unable to reach the airport, the instructor initiated a forced landing to a field. During the approach, the airplane collided with a power transmission line and impacted terrain. An examination of the engine found that the Nos. 1 and 2 exhaust valves displayed excessive wear. While such wear will result in a loss of engine power, it could not be determined what caused the sudden change in noise and engine power that the pilots experienced on the day of the accident.
Probable Cause: A partial loss of engine for reasons that could not be determined during an examination of the engine.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 04-Aug-2016 00:03 | Geno | Added |
| 02-Apr-2018 07:34 | ASN Update Bot | Updated [Time, Departure airport, Destination airport, Source, Narrative] |
Corrections or additions? ... Edit this accident description
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