posted on Mar, 9 2017 @ 06:05 PM
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.