ASN Wikibase Occurrence # 215899
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| Date: | Sunday 30 September 2018 |
| Time: | 08:37 |
| Type: |  Cessna T210M Turbo Centurion II |
| Owner/operator: | T and C Aircraft Corp |
| Registration: | N732MV |
| MSN: | 21061628 |
| Year of manufacture: | 1976 |
| Total airframe hrs: | 6801 hours |
| Engine model: | Teledyne Continental TSIO-520-R |
| Fatalities: | Fatalities: 3 / Occupants: 3 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Owyhee mountains, between Reynolds Creek and Silver City, ID -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Sunrise Skypark, Melba, ID (ID40) |
| Murphy, ID (1U3) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot and two passengers departed on a flight through mountainous terrain to a nearby airport. A review of primary targets that were consistent with the airplane’s flight track; initially, for a 3 minute period, the airplane was flying between 3,200 and 3,400 ft mean sea level (msl) at an average speed of 131 knots calibrated airspeed (KCAS). Radar data were lost for about the next 4 minutes due to mountainous terrain. Once the radar returns were picked up again, for about the next 4 minutes, the flight track showed the airplane continuing a southerly track, climbing from 4,700 to 6,500 ft msl. The last three radar returns showed that, during the last 36 seconds of flight, the airplane’s altitude above the ground decreased as the terrain rose such that the airplane was about 150 ft above ground level at the last radar return; the airspeed decreased to less than 70 KCAS by the end of the data.
The wreckage was located near the bottom of a valley about 1,950 ft west and 15.5 nm east of the wreckage. Postaccident examination of the airplane and engine revealed no evidence of any preimpact mechanical malfunctions or failures that would have precluded normal operation.
Using the approximate conditions that existed at the time of the accident, including an estimated airplane
gross weight of 3,900 lbs (about 100 lbs over the airplane’s maximum allowable gross weight) and flaps at 10°, the airplane’s stall speed was estimated to be about 68 KCAS. A ground scar at the accident site indicated that the left wing impacted terrain first, and the wreckage lay along a heading of 345°, indicating that the pilot was likely turning the airplane during the accident sequence. Given this evidence and that the airplane was losing speed as it climbed over rising terrain near the accident site and was approaching or at its stall speed by the end of the radar data, it is likely that the pilot did not maintain adequate airspeed while making a left turn in mountainous terrain. The gusting wind and low-level wind shear conditions could also contribute to the airplane exceeding its critical angle of attack, which resulted in an aerodynamic stall with the left wing low.
Although the pilot had type 2 diabetes, the accident circumstances are not consistent with incapacitation; therefore, it is unlikely that the pilot's diabetes contributed to the accident. Toxicology testing indicated that the pilot had taken buprenorphine, which can cause somnolence and impaired decision-making, at some point before the accident. However, based on the available information, it could not be determined whether the pilot's use of buprenorphine contributed to the accident.
Probable Cause
The pilot's failure to maintain adequate airspeed and his exceedance of the airplane’s critical angle of attack while making a turn in gusting wind conditions while flying through hilly terrain, which resulted in an aerodynamic stall.
Accident investigation:
 |
|
Sources:
https://www.kivitv.com/news/3-people-and-1-dog-dead-in-plane-crash-in-owyhee-county-mountains
https://www.ktvb.com/article/news/local/sheriff-3-dead-in-owyhee-county-plane-crash/277-599623912
________________________
https://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=732MV
https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/98369/pdf
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 01-Oct-2018 04:25 | Geno | Added |
| 01-Oct-2018 05:48 | Iceman 29 | Updated [Aircraft type, Phase, Source, Embed code, Damage] |
| 01-Oct-2018 06:23 | Iceman 29 | Updated [Location, Embed code] |
| 01-Oct-2018 17:36 | Iceman 29 | Updated [Time, Registration, Cn, Operator, Nature, Source] |
| 02-Oct-2018 02:02 | RobertMB | Updated [Aircraft type] |
| 02-Oct-2018 17:57 | petep44 | Updated [Departure airport] |
| 18-Apr-2022 13:20 | aaronwk | Updated [Time, Departure airport, Destination airport, Source, Narrative] |
| 18-Apr-2022 13:21 | harro | Updated [Destination airport, Embed code, Accident report] |
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