@TT
Look at Lasors 2008, Section F, Appendix C, Page 48.
@Nigel
Look at my post #8
With the FAA you are covered, since we all know there are no type ratings below 5700kg or 12500 lbs. Take a look at above mentioned page 48.
If you want to fly an L4 and have only flown L3s in the last 24 months then you require a checkflight on an L4!
In JAA land it is different...