NTSB Identification: WPR12CA271
14 CFR Part 137: Agricultural
Accident occurred Wednesday, June 20, 2012 in Okanogan, WA
Probable Cause Approval Date: 10/04/2012
Aircraft: GRUMMAN ACFT ENG COR-SCHWEIZER G-164B, registration: N6861K
Injuries: 1 Serious.

NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.

The pilot reported that, while establishing the second boundary along the eastern edge of a field where he was conducting an aerial application, the airplane struck power lines. Following the collision with the power lines, the airplane turned to the left and impacted the ground in a flat attitude, which resulted in structural damage to all four wings and fuselage. The pilot stated that there were four sets of power lines near the field; however, the upper right wing blocked his view of the power lines that the airplane struck. No preimpact mechanical malfunctions were reported that would have precluded normal operation of the airplane.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The pilot's failure to maintain clearance from power lines while maneuvering.

Full narrative available

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