Radar 707. Re level segments. Boeing (in the 737 anyway)recommend that initial flap selection on approach be carried out in level flight meaning that the flaps should not be used as speed brakes. This recommendation is commonly ignored. Flaps 1 through to flaps 5 are selected while the aircraft is going downhill at speeds sometimes well in excess of the recommended especially if the aircraft is closing in towards the localiser during en-route descent. Depends on the pilot's skill I suppose.