On June 23, 1994, a Hiller HU-12E (registration N330CW) was involved in an aviation accident near Watertown, SD. One person was killed. Investigators recorded the probable cause as: impact with a transmission wire during aerial application maneuvers. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A helicopter struck a transmission wire and terrain while maneuvering during aerial application operations. The pilot was not injured, and no mechanical anomalies were found.
What happened
The helicopter was engaged in aerial application operations when it impacted a transmission wire followed by the terrain. The incident occurred while the aircraft was maneuvering in the area.
The investigation
A subsequent examination of the helicopter revealed no pre-existent mechanical anomalies that would have contributed to the accident. A post-mortem examination of the pilot revealed no physical impairment, and toxicological specimens were negative for screened drugs.
Findings
The impact with the transmission wire during low-level maneuvering was the primary factor in the event. No evidence of mechanical failure or pilot incapacitation was found.
Probable cause
impact with a transmission wire during aerial application maneuvers
Frequently asked questions
What happened in the 23 Jun 1994 Hiller HU-12E accident near Watertown, SD?
A helicopter struck a transmission wire and terrain while maneuvering during aerial application operations. The pilot was not injured, and no mechanical anomalies were found.
Were there any fatalities in the 23 Jun 1994 Hiller HU-12E accident?
The accident was fatal, resulting in 1 fatality.
What aircraft was involved and where did it happen?
The accident on 23 Jun 1994 involved a Hiller HU-12E, registration N330CW, at Watertown, SD.
What was the probable cause of the accident?
impact with a transmission wire during aerial application maneuvers
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