Is "flewed down" an attempt at past imperfect? [closed]

'Flewed' does not exist as an inflection/participle of fly.

Its past participle is flown.

There is also no such thing as a 'past imperfect' in English, though the imperfect always implies a past action - I was flying.

No I can't think of any tense, or expression, which would incorporate the meaning of something has just happened.

If French is your language, you have the venir de + infinitive construction Mes amis viennent d'accourir en avion pour me visiter. ("My friends have just flown in to visit me") Perhaps that is what you were looking for, but unfortunately it doesn't exist in English.