Blanche Cohen writes:

How is it possible to operate an aircraft without an engine that
is in operation?

You'll have to ask glider pilots about that.

On the other hand, no reply from anyone here will satisfy your questions.

Quotations of regulations need to at least mention the subject of my
queries. Many people seem to believe that their own personal
interpretation of regulations has the same force of law as the
regulations themselves, but that is not the case.

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