Unexpected Vibrations To Blame For Bell 525 Inflight Breakup: NTSB

Credit: Bell 525: Bell Helicopter
LONDON—Unexpected severe vibrations generated during one-engine inoperative (OEI) flight trials of Bell’s fly-by-wire Model 525 helicopter caused the fatal crash of the first prototype, the NTSB has concluded. The severe vibrations resulted in unintentional control inputs—known as biomechanical...

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