RK Henry writes:

1. In FARs part 1.1, Definitions, "Operate" is defined:

"Operate, with respect to aircraft, means use, cause to use or
authorize to use aircraft, for the purpose (except as provided in
§91.13 of this chapter) of air navigation including the piloting of
aircraft, with or without the right of legal control (as owner,
lessee, or otherwise)."

I don't see the word "engine" anywhere in the quoted text--again.

It's best to read what regulations say, and not try to guess what
you'd like them to mean. Legal documents are generally explicit;
imagination is neither required nor recommended.

If you're planning on using the airplane for flying, I'd interpret
that as beginning with the moment you turn the key 'til the airplane
is back in the hangar.

So it's your interpretation; it's not written in the regulations.

Running the anti-collision system is low-cost insurance. Except for
cases like not operating strobes around people, it's better to just go
ahead and use it. It could save someone's life.

I never expressed any objection to it.

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