§ 25.181. Dynamic stability.
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/us/cfr/t14/s§ 25.181·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
(a)Any short period oscillation, not including combined lateral-directional oscillations, occurring between 1.13 VSR and maximum allowable speed appropriate to the configuration of the airplane must be heavily damped with the primary controls—
(1)Free; and
(2)In a fixed position.
(b)Any combined lateral-directional oscillations (“Dutch roll”) occurring between 1.13 VSR and maximum allowable speed appropriate to the configuration of the airplane must be positively damped with controls free, and must be controllable with normal use of the primary controls without requiring exceptional pilot skill. [Amdt. 25-42, 43 FR 2322, Jan. 16, 1978, as amended by Amdt. 25-72, 55 FR 29775, July 20, 1990; 55 FR 37607, Sept. 12, 1990; Amdt. 25-108, 67 FR 70827, Nov. 26, 2002]
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§ 25.181
Dynamic stability.
Fed. Reg.×1
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