From Post 16 on page 1,
"Tail wheel, basic gas turbine (ie C208), csu endorsement - endorsed on a design feature of an aircraft. Yours for life. Only check is whatever is required by the owner / operator of the aircraft you're trying to borrow."
I don't have a "basic gas turbine" or anything like it in my log books, but am endorsed on 4 M/E turbines. (Incl above and below 5700kg) Does that cover it I wonder? Any ideas out there?