Aviation Accident Summary NYC88IA186

MANHATTAN, NY, USA

Aircraft #1

N135CP

MBB BK-117

Analysis

AS THE PLT OF AN S-76 HELICOPTER WAS HOVERING TO PARK NEXT TO A PARKED MBB BK 117 HELICOPTER, N135CP, THE MAIN ROTOR BLADES OF N135CP BEGAN FLAPPING. SUBSEQUENTLY, ONE BLADE FAILED FROM DOWNWARD OVERLOAD, ABOUT 29 INCHES FROM THE MAIN RETAINING PIN CENTER.

Probable Cause and Findings

FAILURE OF THE MAIN ROTOR BLADE APPEARS TO BE THE RESULT OF A STATIC DOWNWARD BENDING OVERSTRESS, CAUSED BY ANOTHER HELICOPTER HOVERING OVER OR VERY CLOSE TO THE MAIN ROTOR BLADE AS IT WAS IN A STATIC/STOPPED POSITION.

 

Source: NTSB Aviation Accident Database

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