It was generally assumed that at 1,500 you were safe from AK.
Well, that's the 'effective' range..... but you'd still want to keep your head down at double that.
er340790, as I said that's when flying ie a vertical shot. As my anecdote explained, at 2,000 feet the round was pretty much spent, penetrated one thin sheet of aluminium and just caused a dent in the next. For 50 cal 4,500 feet in the vertical taken to be "safe".
Photo is of a nav light flasher relay that took an AK round when we were either on the ground or low flying. Penetrated the outer skin of thin aluminium before impacting. Round came to rest in the relay with a mushroomed head. Range indeterminate, never even heard the shot.