Awful lot of information in the MU2 POH about flying in icing. Engine inlet heat on (bleed air source), ignitors on continuous, prop heat on, boots on. Pitot heat should be turned on when taking the runway. If you do all that correctly and when entering icing conditions the experience your friend had should be rare. That said, ice can get any airplane. I would rather avoid ice entirely of course, but I would rather be in an MU2 than a P337 if flying in icing conditions. The icing testing the MU2 has undergone is more extensive than most any other turboprop. Tom Batchelor wrote an extensive article on that subject. He was the test pilot for those icing tests. Something every aspiring MU2 pilot should read. I can't seem to attach it here, but I can send it via e mail if someone wants to read it.
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