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Bell 525 investigation looking at vibration and resonance

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posted on Mar, 9 2017 @ 06:05 PM
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It was leaked to R&WI that the NTSB is looking at an unusual vibration and frequency resonance in the airframe and controls of the Bell 525 as the cause of the crash over Texas. The #1 prototype was at 183 knots, with 92% power, performing a single engine never exceed speed test, when a vibration at 6 hertz vibration appeared in the tail rotor, followed by a significant drop in the main rotor RPM system, which allowed the rotors to drop out of plane, striking the nose and tail boom.

The cockpit voice recorder was unavailable for analysis, because in an insane regulation, the CVR was not powered. The FAA allows test flights to operate without the CVR operating.

www.rotorandwing.com...




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