Interestinly enough CASA seems to have dropped 'ASETPA' Approved Single Engine Turbine Powered Aircraft and now use the acronym 'ASEA' which I guess would be Approved Single Engine Aircraft. Subtle perhaps but significant. If there's an engine manufacturer who can prove a better than 1 IFSD in 100'000 hours for a piston engine maybe SE IFR CHTR could get up.