You are correct you don’t have to. I just asked in my post whether they could if they wanted to build up some hours on the engines to test them whilst keeping an airframe alive.It would also allow any work that MAY need doing to her engines to be done,it was a hypothetical question.
If you have flight restored engines and you intend to fly that aircraft in the UK you are required (mandatory CAA requirement) to undergo a ground testing scenario where the engines are, over a number of hours, gradually operated at increasing power settings. For Merlins its normally around five hours on the ground and yes, if there were any adjustments needed you would deal with that and then fly. What you would be less likely to do is to install expensive flight ready engines in an aircraft intended solely for ground running/taxiing ‘just to test them’ as it would be a very expensive excercise to do that.
Of course ‘they could if they wanted to’ – in the same way they can do anything they want to their own property but perhaps its more sensible to discuss what might possibly happen in reality or be prudent practice?
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