George,

 

My understanding is the FAA requires "A Type-Certificated Engine/Propeller Combination". to qualify for the 25 hour test period.

 

Does that mean that a certified bird must be out there with the same exact engine and propeller?  What about an STC for a certain propeller on that engine?  I took no chances and found a Type Certificate Data Sheet with my engine and propeller combination and had it ready at my DAR inspection.  My IO-550N and the new Hartzell Scimtar propeller are exactly what flies on the Cirrus SR22, right down to the last little number and letter.

 

The DAR requested the engine model and the propeller model a couple days before our inspection.  I'm not sure how much looking he did, my guess is he has some searchable database of engine/propeller combinations that are certified.  Or maybe he just saw Continental and Hartzell?  I doubt it though, he was pretty thorough.

 

Mike Easley

Colorado Springs