Ideally, should 737 flaps be extended in level flight or not.
well the only recomendation about flap/altitude thing is the 20000 ft and is only a recomendation.Persnonally i use F5 and IAS210-220 during descent .It gives u the best angle plus saves time from levelling of at 210 and then selecting F5 and start descending again .Most of the ATC in main european airports are trying to avoid any kind of level off during approach due to noise restrictions etc.This kind of approach makes their lives easier and the fellow neighbours have nothing to complain about.
