Current as of: Jan. 2010
(a) The never-exceed speed VNE must be established so that it is--
(1) Not less than 0.9 times the minimum value of VD allowed under Sec. 23.335; and
(2) Not more than the lesser of--
(i) 0.9 VD established under Sec. 23.335; or
(ii) 0.9 times the maximum speed shown under Sec. 23.251.
(b) The maximum structural cruising speed VNO must be established so that it is--
(1) Not less than the minimum value of VC allowed under Sec. 23.335; and
(2) Not more than the lesser of--
(i) VC established under Sec. 23.335; or
(ii) 0.89 VNE established under paragraph (a) of this section.
(c) Paragraphs (a) and (b) of this section do not apply to turbine airplanes or to airplanes for which a design diving speed VD/MD is established under Sec. 23.335(b)(4). For those airplanes, a maximum operating limit speed (VMO/MMO-airspeed or Mach number, whichever is critical at a particular altitude) must be established as a speed that may not be deliberately exceeded in any regime of flight (climb, cruise, or descent) unless a higher speed is authorized for flight test or pilot training operations. VMO/MMO must be established so that it is not greater than the design cruising speed VC/MC and so that it is sufficiently below VD/MD and the maximum speed shown under Sec. 23.251 to make it highly improbable that the latter speeds will be inadvertently exceeded in operations. The speed margin between VMO/MMO and VD/MD or the maximum speed shown under Sec. 23.251 may not be less than the speed margin established between VC/MC and VD/MD under Sec. 23.335(b), or the speed margin found necessary in the flight test conducted under Sec. 23.253.
[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964, as amended by Amdt. 23-7, 34 FR 13096, Aug. 13, 1969]________________________________________________________________________
Questions & Answers: AircraftState Laws: Aircraft
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