NTSB Identification: WPR12LA256
14 CFR Part 137: Agricultural
Accident occurred Monday, June 11, 2012 in Riverton, WY
Aircraft: AYRES S2R-G6, registration: N70WY
Injuries: 1 Uninjured.

This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed. NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

On June 11, 2012, about 0720 mountain daylight time, an Ayres Corporation S2R-G6, N70WY, made an off airport forced landing in uneven terrain near Riverton, Wyoming. Sky Aviation was operating the airplane under the provisions of 14 Code of Federal Regulations (CFR) Part 137. The commercial pilot was not injured; the airplane sustained substantial damage from impact forces. The local aerial application flight departed Riverton about 5 minutes prior to the accident. Visual meteorological conditions prevailed, and no flight plan had been filed.

The pilot reported that he departed a dirt strip. Shortly thereafter, he observed movement of the torque and temperature gauges to high values. The engine did not respond to his speed or power lever inputs. He stated that the linkage and amount of travel of the controls felt normal, but the engine did not follow the control movement.

The fuel control unit had previously been removed when it failed to move from a midrange power setting. Following testing and replacement of a valve, the unit was reinstalled on the airplane. No adjustments had been made to the unit since that time, and the airplane accumulated about 50 hours prior to the accident flight.

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