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| Date: | Saturday 19 May 2007 |
| Time: | 18:16 |
| Type: |  Ayres S-2RHG-T65 Turbo Thrush 550 |
| Owner/operator: | Mettler Aerial Inc |
| Registration: | N40097 |
| MSN: | T65HG-011 |
| Year of manufacture: | 2004 |
| Total airframe hrs: | 581 hours |
| Engine model: | Pratt & Whitney PT6A-60AG |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Other fatalities: | 0 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Tyndall, SD -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | Hurley, SD (1SD3) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
An agricultural application airplane impacted power lines and terrain while maneuvering. A post impact fire occurred. The operator's accident report stated that "10-15 minutes before [the] crash eye witness reports indicate all was normal. Thunderstorms in the area developed rapidly. At [the] time of [the] crash eyewitness accounts, per Sheriff's report, were very heavy rain and some hail, 20 [feet] visibility." Examination of the wreckage revealed a section of powerline was found wrapped around the airplane's hopper. A propeller blade had a semicircular depression on its leading edge. The recorded weather about 25 miles east of the accident site was: Wind 240 degrees at 8 knots; visibility 10 statute miles; sky condition scattered clouds 7,500 feet; temperature 28 degrees C; dew point 13 degrees C; altimeter 29.90 inches of mercury; remarks lightning observed in the distant west, thunderstorm ended at 18 minutes before the accident. Low levels of an antidepressant was a finding in the pilot's toxicology report.
Probable Cause: The pilot not maintaining altitude/clearance from a powerline while maneuvering. A factor was the low visibility associated with the thunderstorm and the powerlines.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20070522X00613&key=1
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Oct-2008 00:45 | ASN archive | Added |
| 21-Dec-2016 19:24 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency, ] |
| 04-Dec-2017 18:38 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Source, Narrative, ] |
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