I wouldn't blame the machine for the Aussie MRH-90 availability, I'd blame Australia.
Look at the Seasprite. An absolute disaster in Australia (did it EVER go into service?) and a star in NZ with good availability and a good reputation.
Not sure about the big engine failure, it was an engine failure. Cause unknown as yet. Happens in airliners too. It is standard practice in many military forces to ground the machines if there is a failure that cannot be determined quickly.
And the availability of the RNZAF NH-90's seems to be fine too. Except when they are hit by lightning or hit vegetation in confined areas
