Aviation Accident Final Report - National Transportation Safety Board: https://app.ntsb.gov/pdf
NTSB Identification: GAA17CA265
14 CFR Part 137: Agricultural
Accident occurred Sunday, May 07, 2017 in Waterloo, IL
Probable Cause Approval Date: 07/05/2017
Aircraft: ROTORCRAFT DEVELOPMENT CORP OH-58A+, registration: N993YC
Injuries: 1 Uninjured.
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 helicopter pilot reported that, while maneuvering at a low altitude for an agricultural application flight, he began flying along the north side of the intended spraying field. He added that he was paying attention to the trees along the field to maintain adequate clearance. He further added that the main rotor blades struck transmission wires and that he then heard a “high pitch sound” coming from the engine and the rpm decrease. The nose pitched up, and the helicopter impacted the ground and rolled onto its right side.
The helicopter sustained substantial damage to the fuselage and empennage.
The pilot reported that there were no preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation.
The pilot reported that he had noticed the transmission wires earlier in flight but that he later forgot where they were located.
The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
The pilot’s failure to see and avoid transmission wires while maneuvering at a low altitude.
The helicopter pilot reported that while maneuvering at a low altitude for an agricultural application flight he began flying along the north side of the intended spraying field. He added that he was paying attention to the trees along the field to maintain adequate clearance. He further added that the main rotor blades struck transmission line wires, and then he heard a "high pitch sound that came from the engine" and the rpm decreased. The nose pitched up and the helicopter impacted the ground and rolled onto its right side.
The helicopter sustained substantial damage to the fuselage and empennage.
The pilot reported that there were no preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation.
The pilot reported that he had noticed the transmission line wires earlier in flight, but later had forgotten where they were located.
Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Saint Louis, Missouri
Aviation Accident Factual Report - National Transportation Safety Board: https://app.ntsb.gov/pdf
Investigation Docket - National Transportation Safety Board: https://dms.ntsb.gov/pubdms
Klinkenborg Aerial Spraying and Seeding Inc: http://registry.faa.gov/N993YC
NTSB Identification: GAA17CA265
14 CFR Part 137: Agricultural
Accident occurred Sunday, May 07, 2017 in Waterloo, IL
Aircraft: ROTORCRAFT DEVELOPMENT CORP OH-58A+, registration: N993YC
Injuries: 1 Uninjured.
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 helicopter pilot reported that while maneuvering at a low altitude for an agricultural application flight he began flying along the north side of the intended spraying field. He added that he was paying attention to the trees along the field to maintain adequate clearance. He further added that the main rotor blades struck transmission line wires, and then he heard a "high pitch sound that came from the engine" and the rpm decreased. The nose pitched up and the helicopter impacted the ground and rolled onto its right side.
The helicopter sustained substantial damage to the fuselage and empennage.
The pilot reported that there were no preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation.
The pilot reported that he had noticed the transmission line wires earlier in flight, but later had forgotten where they were located.
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