Thursday, August 4, 2016

Air Tractor AT-301, N23923: Accident occurred August 02, 2016 in Weiser, Washington County, Idaho

FAA Flight Standards District Office: FAA Boise FSDO-11

NTSB Identification: WPR16LA159
14 CFR Part 137: Agricultural
Accident occurred Tuesday, August 02, 2016 in Weiser, ID
Aircraft: AIR TRACTOR INC AT 301, registration: N23923
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 August 2, 2016, about 0930 mountain daylight time (MDT), an Air Tractor, AT 301, N23923, lost partial engine power near Weiser, Idaho. The airplane was operated by Beck's Flying Service under the provisions of 14 Code of Federal Regulations (CFR) Part 137. The airline transport pilot was not injured. The airplane sustained substantial damage during the accident sequence. The local agricultural application flight departed Weiser, Idaho, about 0920. Visual meteorological conditions prevailed and no flight plan had been filed.

The pilot reported that after departing with a load of liquid sulfur he noted the cylinder head temperature was increasing but he attributed it to having a heavy load. He attempted to lighten the load by applying the sulfur to the field but noted that the cylinder temperature was continuing to increase, and engine power was decreasing. The pilot was able to jettison the remaining sulfur load and make a forced landing in to a field. During the landing the left wing impacted vegetation which caused the airplane to rotate, followed by the left main landing gear separating from the fuselage.

Post-accident examination revealed damage to the engine mounts and to the attach point for the left main landing gear.

The airplane was recovered for further examination.

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