14 CFR 23.1511 - Flap extended speed.
(a) The flap extended speedVFE must be established so that it is -
(1) Not less than the minimum value of VF allowed in § 23.345(b); and
(2) Not more than VF established under § 23.345(a), (c), and (d).
(b) Additional combinations of flap setting, airspeed, and engine power may be established if the structure has been proven for the corresponding design conditions.