But is the experience today that this condition has taken aircraft out of the sky with fatal consequences
Would need to search, but seem to recall airliners have had ice crystal issues, can recall some biz jet instances including a dead stick to a safe runway landing of a Citation, no fatalities that I'm aware of.
https://www.boeing.com/commercial/ae...icle_03_2.html
https://www.nasa.gov/centers/glenn/a...igid_heat.html