§ 25.1505. Maximum operating limit speed.
127 words·~1 min read·
/us/cfr/t14/s§ 25.1505·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
The maximum operating limit speed (VMO/MMO airspeed or Mach Number, whichever is critical at a particular altitude) is 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 and so that it is sufficiently below VD/MD or VDF/MDF, 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 VDFM/DF may not be less than that determined under § 25.335(b) or found necessary during the flight tests conducted under § 25.253. [Amdt. 25-23, 35 FR 5680, Apr. 8, 1970]