Originally Posted by
Midlifec
Very good reason to believe that the surface de-ice was known to be inop on the subject aircraft.
The above quote is is only supposition, my betting is that the Wing De-ice systems were in working order ( leading edge / stabilator / tailplane ) The propeller has de-ice as well.....now the unknown in all this is: Had the pilot read the POH for the PA46 310 ? ( It is 370 pages )