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The European Aviation Safety Agency says that although the investigation into the root cause of the accident – in which 13 passengers and crew lost their lives – remains ongoing, “the partial information available so far indicate[s] in-flight separation of the main rotor hub from the main gearbox”.
Footage of the incident clearly shows the main rotor assembly spinning to earth having detached from the rest of helicopter.
In its airworthiness directive, EASA says that prior to the next flight operators must check the correct installation of the main gearbox suspension bars; examine the chip detectors and oil filters for the presence of metallic particles; and download data from the vibration health monitoring system for threshold exceedances.
originally posted by: Zaphod58
CHC, who operated the crashed helicopter has filed Chapter 11 bankruptcy.