13 Nov 2011: MESSERSCHMITT-BOLKOW-BLOHM BK 117 B-2 — AIR METHODS CORP

13 Nov 2011: MESSERSCHMITT-BOLKOW-BLOHM BK 117 B-2 — AIR METHODS CORP

No fatalities • Carbondale, IL, United States

Probable cause

The main rotor blade’s contact with the vertical stabilizer during the engine shutdown in strong, gusty wind conditions.

— NTSB Determination

Accident narrative

During an engine shutdown procedure following an emergency medical services flight, a main rotor blade sustained substantial damage when it contacted the left vertical stabilizer. The main rotor blade broke near its root and the tailboom and tail rotor driveshaft cover were dented. The operator reported that there were no mechanical malfunctions with the helicopter. Local recorded winds were 190 degrees at 25 knots gusting to 34 knots.

Contributing factors

  • cause Unintentional use/operation
  • Contributed to outcome

Conditions

Weather
VMC, wind 190/25kt, vis 10sm

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