Aviation Accident Summaries

Aviation Accident Summary ERA09CA205

Richmond, VA, USA

Aircraft #1

N2360M

ROBINSON HELICOPTER R22 BETA

Analysis

The helicopter pilot stated that, upon reaching cruising altitude, he reached to pull the trim adjustment knob but inadvertently pulled the mixture control knob, which caused the engine to shutdown. The pilot immediately lowered the collective lever and entered an autorotation. He attempted to restart the engine using the throttle and the starter but did not advance the mixture control from the idle cut off position. As he flared the helicopter to land, the windscreen contacted powerlines, and then the helicopter struck an automobile on a roadway. The helicopter sustained damage to the windscreen, main rotor blades, and tailboom. The Pilot's Operating Handbook for the Robinson R-22 states that "If the mixture control is inadvertently pulled in flight, engine stoppage will result. To avoid pulling the wrong control, always reach around left side of cyclic to actuate lateral trim."

Factual Information

The pilot of the Robinson R-22 helicopter stated that upon reaching cruising altitude, he reached to pull the trim adjustment knob, but inadvertently pulled the mixture control knob, which caused the engine to shutdown. The pilot immediately lowered the collective lever and entered an autorotation. He attempted to restart the engine, using the throttle and the starter, but did not advance the mixture control from the idle cut off position. As he flared the helicopter to land, the windscreen contacted powerlines, and then the helicopter struck an automobile on a roadway. The helicopter sustained damage to the windscreen, main rotor blades, and tailboom. The pilot operating handbook for the Robinson R-22 helicopter states that "If the mixture control is inadvertently pulled in flight, engine stoppage will result. To avoid pulling the wrong control, always reach around left side of cyclic to actuate lateral trim."

Probable Cause and Findings

A loss of engine power due to the pilot inadvertently shutting down the engine.

 

Source: NTSB Aviation Accident Database

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