An interesting sidenote is that TOPCAT is the first STC in history that modifies the owner, not the airplane. Once the STC is issued, the owner can work on any 150/152 that he is an owner (or partial owner) of, even after selling the original STC'd plane.
I don't understand this. Why does the owner's plane get moved from standard category to "special," if the STC allows the owner to work on any 150/152 that he subsequently owns without having to STC that aircraft to special? What impact does the STC have on market value of the airplane when it comes time to sell? Can the aircraft be moved back to the standard airworthiness certificate at a later time? I believe Canada has a similar program and I seem to recall the airplane takes a hit when it comes time to sell.
I'd be much more interested in Topcat if it didn't change the airworthiness certificate of my airplane and it truly just applied to my qualification to work on the 150/152.
