The issue with MS21042 nuts (and some other hardware) is dragging on for some time. Several AD`s issued against different installations on same and/or different heli types but almost allways same PN - and it seems all coming from single manufacturer, based in Ohio, USA. (correct me if I am wrong)
I am watching in disbelief, how this issue is handled so far by EASA, FAA.....
EASA issued an SIB 2012-06 Rev. 2
EASA Airworthiness Directives Publishing Tool
that was mentioning the issue sometime ago - and yet problems keeps on coming. I am afraid this will continue so until more serious consequences result from cracked hardware, that is installed in many many places, some critical.
Robinson seems to be the only one, that took the only reasonable measure.
If you can`t trust the basic nut and bolt, then there is a real problem.
regards,
hoistop