What I am disagreeing with is Jim's statement that:

 

1) the engine  becomes "experimental" -- not true-- it becomes "unairworthy" with regards to certificated installations and

 

2) the engine needs to be torn down-- again not true-- the engine needs an inspection by an IA to determine if it meets airworthiness standards (TCDS conformance).

Jeff,

 

OK, fine.  I was concerned with the Cessna analogy.  And I understand, in that I believe that things not fitting specifications only make the aircraft unairworthy.  For example, the installation of a replacement device that is not new or yellow tagged can result in the aircraft losing its airworthy status.

 

If I understand things correctly, any TSo device, avionic or Type-sheet engine that was once installed on an amateur-built experimental aircraft cannot be installed in (on) an STC (type-sheet) aircraft as a replacement for a type-sheet item without that item being certified as being up to its original standards - i.e. yellow tagged by a certificated repair station or, in the case of an unmodified engine, an AI with the appropriate P authority.  Otherwise, the aircraft could lose its airworthy status.

 

Scott