Originally Posted by
rotorspeed
Yes agree Crab. And hoped someone would know where the 0 deg was - certainly not icing then if as high as 6k. Maybe it was as simple as flying IMC but just not high enough. The GPS trail the AAIB normally seem to get should make it fairly clear, if it was straight in or meandering. Assuming it's recoverable.
If the zero degree isotherm was at 6000' then it's quite possible to get ice at 2500' . Add frontal or cb activity and then icing is even more of a possibility. Then of course there's turbulence and downdraights.