Originally Posted by
JohnBurke
Your limitation line appears intended to state that the limitation applies:
A) to 172 models with greater than 150 hp
B) to 172 models with "STOL wingtips."
As not all 150 hp powered 172's employ stol wingtips, and your statement seems to imply that it's to aircraft with 150 hp or greater or that have STOL tips, then why not put the language to say as much.
Or do you only limit the use of your STC to those aircraft that have both an engine of 150 hp or greater and STOL tips?
It's okay to spell out exclusions, if known, or to be specific in the applicability or effectivity of the STC.
A DAR is always a good idea of you're seeking an approval. The cost of what's involved in an approval depends on what you're trying to accomplish.
Use caution seeking counsel at the FSDO level.
I should have been more clear - I am not the author of the STC, just an end user. But yes, what you are saying is what I'm trying to figure out: whether the wingtip requirement is an implied "and/or" or firmly "and".