I also believe that one reason that they are doing the extension is for EMS. Currently the aircraft cabin is too short to accomadate a litter. It will also be interesting to see what else they have to do as it uses the same basic dynamic rotor components of the 407 but because of the higher weight of the additional engine has a higher disk loading which has hurt performance. I also understand that since it has only one hydralic system that it can not be certified for SPIFR, only dual pilot. It is a good looking ship, so hopefully they can get things straightened out.