HFDM/HOMP: OK but PHI, Cougar and CHC have had to carry out hardware modifications to the aircraft to enable HFDM, so as I said the aircraft does not support HFDM (out of the box). Any aircraft can be modifed to enable HFDM but that is not the point.
The 225 & 155 come with functional HFDM out of the box.
HC