ASN Wikibase Occurrence # 196644
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| Date: | Thursday 13 July 2017 |
| Time: | 09:40 |
| Type: |  Aviat A-1B Husky |
| Owner/operator: | SWGB Aviation LLC |
| Registration: | N211AM |
| MSN: | 2110 |
| Year of manufacture: | 2000 |
| Total airframe hrs: | 871 hours |
| Engine model: | Lycoming O-360-A1P |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Butterfield Canyon, Salt Lake County, W of Herriman, UT -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Training |
| Departure airport: | West Jordan, UT (U42) |
| West Jordan, UT (U42) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The flight instructor and pilot receiving instruction, departed on an instructional flight and proceeded toward mountainous terrain. A witness saw the airplane in a box canyon and reported that the airplane made a steep right turn and the nose dropped. To the witness, it appeared that the airplane was trying to escape the box canyon and that the speed of the airplane increased after the nose of the airplane dropped. The witness lost sight of the airplane behind terrain. Shortly thereafter, the witness saw smoke coming from the area where he had last seen the airplane. The wreckage was subsequently located by law enforcement personnel on down sloping terrain.
Examination of the airframe and engine revealed no preaccident mechanical anomalies that would have precluded normal operation.
The density altitude at the departure airport was 7,000 ft mean sea level (msl); the density altitude in the area of the accident site was over 10,000 ft msl. Given the high-density altitude it is likely that the airplane performance was decreased, and there was not enough engine power available for the airplane to climb out of the box canyon. It is also likely that as a result of the turn, the true airspeed increased the radius of the turn, and the pilot would have attempted to compensate and increased the bank angle and exceeded the airplanes critical angle of attack resulting in a stall.
Probable Cause: The flight instructor's decision to conduct a low-altitude flight into a box canyon in high density altitude conditions and his failure to maintain airspeed while maneuvering to escape the canyon, which resulted in an exceedance of the airplane's critical angle of attack and an aerodynamic stall.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=N211AM
History of this aircraft
Other occurrences involving this aircraft
| 4 August 2013 | N211AM | Tim Miller | 0 | West Jordan, Utah | |
sub |
Location
Images:
Photo: NTSB
Media:
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Jul-2017 18:26 | Captain Adam | Added |
| 13-Jul-2017 18:27 | harro | Updated [Aircraft type, Total occupants, Other fatalities, Damage] |
| 13-Jul-2017 22:17 | Iceman 29 | Updated [Time, Aircraft type, Embed code, Narrative] |
| 14-Jul-2017 01:16 | Geno | Updated [Aircraft type, Departure airport, Source, Narrative] |
| 14-Jul-2017 17:04 | Geno | Updated [Registration, Cn, Operator, Location, Source, Narrative] |
| 14-Jul-2017 21:57 | Aerossurance | Updated [Location, Nature] |
| 19-Apr-2020 07:00 | ASN Update Bot | Updated [Time, Operator, Nature, Departure airport, Destination airport, Source, Narrative, Accident report, ] |
| 19-Apr-2020 07:42 | harro | Updated [Operator, Phase, Source, Narrative, Photo, Accident report, ] |
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