Originally Posted by
TeamSasquatch
Sounds like a big project to get the STC (based on the text box they have on the website). I’d guess the volume of the 1900D would help to recoupe some of the cost. Probably would need to acquire and convert a good number to make it pan out.
I seem to remember asking once way back when I worked at Ameriflight about the D models, and the answer was that the performance was worse out of many airports, due to the 1900C being an SFAR 41C airplane, versus the 1900D being Part 23 Commuter Category.