Hi Jerome;
I’m Steve and I believe that the Robertson STOL kit STCs were held by Sierra Industries in Texas. In late 2013, Innova Aerospace bought Sierra Industries. Unfortunately, in 2018 one news report said that Innova Aerospace had shut it’s doors but a report later that year said that Innova Aerospace had given two seminars at AirVenture in Wisconsin in late July.
The seminars were about engine upgrades on Beech King Airs.
The website mentioned in the article does not work.
I looked over the STC listing on the FAA website for your airplane but did not see a STC for this modification listed.
I’ll keep looking and let you know if I find anything helpful
Steve
Participant
