Matthew, we turned out to be wrong. According to AC 21-70, the "certain conditions" are nothing more than "being maintained by an FAA-certified mechanic or appropriately rated repair station". This is because, unlike the S-LSA that came later, Primary a/c were intended to be maintained by pilots-operators. So, it turns out that Cessna Pilot Centers can instruct in white-certed Skycatchers all they want. -- Pete