There have been four rather significant failure events in the past couple of years:
1. AH Gearbox issue/crash(s)
2. SA Run-dry issue/crash
3. AW 609 crash
4. Bell 525 crash
JD
Big differences between AH (unknown design deficiency), SA (known design deficiency), and 609/525 which were accidents which occurred during experimental flight test beyond the normal operating envelope. Problems with passenger carrying certified aircraft should be kept separate from aircraft in development.
The Sultan