Sec. 25.251 - Vibration and buffeting.
(a) The airplane must be demonstrated in flight to be free from any vibration and buffeting that would prevent continued safe flight in any likely operating condition.
(b) Each part of the airplane must be
demonstrated in flight to be free from excessive vibration under any
appropriate speed and power conditions up to V
(c) Except as provided in paragraph (d) of this section, there may be no buffeting condition, in normal flight, including configuration changes during cruise, severe enough to interfere with the control of the airplane, to cause excessive fatigue to the crew, or to cause structural damage. Stall warning buffeting within these limits is allowable.
(d) There may be no perceptible
buffeting condition in the cruise configuration in straight flight at any
speed up to V
(e) For an airplane with M
[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as
amended by Amdt. 25-23, 35 FR 5671, Apr. 8, 1970; Amdt. 25-72, 55 FR
29775, July 20, 1990; Amdt. 25-77, 57 FR 28949, June 29, 1992]