On August 13, 2005, a Robinson R44 (registration N534SE) was involved in an aviation accident near Greenwood, IN. Investigators recorded the probable cause as: The pilot's reduction of collective control during forward flight, which induced a pitch oscillation leading to a rollover. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 5 related events involving the same aircraft type or operator are linked below.
A sightseeing helicopter experienced a pitch oscillation and rolled onto its side after the pilot reduced collective control during forward flight. Inspection revealed no mechanical anomalies.
What happened
During a sightseeing flight, the helicopter contacted the ground with the forward tips of its skids while maintaining forward motion. The pilot reported that he reduced the collective pitch control, which immediately resulted in a pitch oscillation. This instability caused the aircraft to roll over onto its side.
The investigation
Following the incident, an inspection of the helicopter was conducted to determine if mechanical issues contributed to the accident. The examination revealed no anomalies or defects that would have precluded normal operation of the aircraft.
Probable cause
The pilot's reduction of collective control during forward flight, which induced a pitch oscillation leading to a rollover.
What happened in the 13 Aug 2005 Robinson R44 accident near Greenwood, IN?
A sightseeing helicopter experienced a pitch oscillation and rolled onto its side after the pilot reduced collective control during forward flight. Inspection revealed no mechanical anomalies.
What aircraft was involved and where did it happen?
The accident on 13 Aug 2005 involved a Robinson R44, registration N534SE, at Greenwood, IN.
What was the probable cause of the accident?
The pilot's reduction of collective control during forward flight, which induced a pitch oscillation leading to a rollover.
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