SCHWEIZER AIRCRAFT CORP G 164B near Stockton, CA — 2018-03-27

Probable cause

The pilot's failure to maintain clearance with power lines while maneuvering during an aerial application flight.

NTSB narrative

The commercial pilot was performing an aerial application flight and was making a pass under two sets of high tension wires in proximity to the support tower. The airplane clipped the second set of wires, which resulted in the pilot's loss of control and the airplane's impact with the ground in a nose-down attitude. No anomalies with the airplane or engine were reported that would have precluded normal operation.

Analysis

Primary failure mode

Human factors

First missed decision gate

Pilot could have avoided flying under the power lines after being advised by the ground crew.

NTSB coding

• Loss of visual reference · Maneuvering-low-alt flying
• Attention / Monitoring

Evidence available

• 5 docket documents

Docket documents5

• Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1form
• Statement of Party Representatives to NTSB Investigationinterview
• Witness Statementsinterview
• Maps or Charts of Accident Areaother
• Toxicological Reportreport

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