In-flight pictures of the first conversion and the engineering process are available and it thus stand to reason that the "technical" problems of the conversion have been solved.
However, I've been unable to find said STC on the FAA site - searching among Precision Conversions, Wagner and Erickson. Nor do the respective web pages of those companies actually claim any such STC to exist.
Consequently I assumed that the expression "certification problem" was the operative words in the original posting.
Iceland is a JAA and EEC member. I would be most surprised if they can skip the EASA procedure.
Rubber stamping other authorities approvals terminated when
On 28 September 2003, the Agency [EASA] took over responsibility for the airworthiness and environmental certification of all aeronautical products, parts, and appliances designed, manufactured, maintained or used by persons under the regulatory oversight of EU Member States.
Link to EASA certification.
The airframe may enjoy "grandfather rights" - the later STC not.
Or do I suffer a king-size misunderstanding
