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Federal Aviation Regulations

Sec. 23.1505 — Airspeed limitations.

(a) The never-exceed speed V NEmust be established so that it is—

(1) Not less than 0.9 times the minimum value of V Dallowed under §23.335; and

(2) Not more than the lesser of—

(i) 0.9 V Destablished under §23.335; or

(ii) 0.9 times the maximum speed shown under §23.251.

(b) The maximum structural cruising speed V NOmust be established so that it is—

(1) Not less than the minimum value of V Callowed under §23.335; and

(2) Not more than the lesser of—

(i) V Cestablished under §23.335; or

(ii) 0.89 V NEestablished 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 V D /M Dis established under §23.335(b)(4). For those airplanes, a maximum operating limit speed ( V MO /M MO-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. V MO /M MOmust be established so that it is not greater than the design cruising speed V C /M Cand so that it is sufficiently below V D /M Dand the maximum speed shown under §23.251 to make it highly improbable that the latter speeds will be inadvertently exceeded in operations. The speed margin between V MO /M MOand V D /M Dor the maximum speed shown under §23.251 may not be less than the speed margin established between V C /M Cand V D /M Dunder §23.335(b), or the speed margin found necessary in the flight test conducted under §23.253.

[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964, as amended by Amdt. 23–7, 34 FR 13096, Aug. 13, 1969]

NEXT: Sec. 23.1507 - Operating maneuvering speed.
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