derekbox

I am looking into PRK, I skydive and the eye flap with skydiving is a big unknown so I was recommended PRK.

Technically correct: The best sort of correct! 91.409 does apply to you. All of part 91 apply to all US registered aircraft (now within certain regs, there are exemptions to exclude certain groups). I say this, because I was corrected but an FAA inspector in the past for saying "annual" when referring to an amateur built plane inspection and was corrected. When I got my IA license, the instructor also emphasized the same thing. No idea why, but some people in aviation draw a differentiation (and now I am doing it. Doh).

Have you ever looked at CFR 1.1? It is the "definitions" section. I looked, "the" is not in there, so I guess it is open to legal interpretations.

The tricky part here is that there are two usages of the words "annual". It is both the time interval and the inspection of a certified aircraft. Often times you will see the experimental called out as a annual condition inspection.

Experimental aircraft do not have a type certificate. An annual inspection is a type certificate conformity inspection. So experimentals can not get annuals, they get condition inspections. Not trying to nit pick, just giving you a little insight. I am an avionics tech, A&P/IA, private pilot so if you ever have any questions, feel free to hit me up.