Hi Tribal,
I don't know excactly, but when we started with SX16 on Bo105s, they weren't allowed to go IFR with the kit installed.
The reason was, that without proper testing and certifing, you weren't sure, wheather the SX16 would affect airspeedindication and Nav-instruments.
So when we changed over to fly BK117 with SX16 and FLIR, the helicopters went through flighttesting with the gear and certifing was done with some amendments to the flight manual.
That's a quite expensive move - and if nobody has done it before with the Bell - you're just not allowed to go IFR with the kit.
Greetings Flying Bull