NTSB Factual Report

This report is based on information received by the NTSB. Additional details may be found in the NTSB's public docket for this case. For further information, please contact the NTSB Office of Public Inquiries.

NTSB Probable Cause

The pilot's abrupt (improper) control action which resulted in the main rotor contacting the tail boom. Contributing factors were the false indication provided by the engine tachometer, the pilot's decision to immediately initiate an autorotation instead of performing a precautionary landing, and the corn field encountered during landing.