Original Message

See this AD from just 4 months ago for the T/R:

https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf/AOCADSearch/DF367EB17C1CC3D6862585AE004B5306?OpenDocument

See this AD from 2016 about the T/R drive shaft:

https://www.federalregister.gov/documents/2016/09/15/2016-21707/airworthiness-directives-agusta-spa-helicopters

For the LTE naysayers out there, I know UH-60's have had it at altitude and even CH-54 Skycranes have run into it.  Conditions definitely have to be just right and a pilot being slow to respond will only make it worse, but it's certainly possible in any helicopter.