[Code of Federal Regulations]

[Title 14, Volume 1]

[Revised as of January 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 14CFR25.181]



[Page 364]

 

                     TITLE 14--AERONAUTICS AND SPACE

 

CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION

 

PART 25_AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES--Table 

of Contents

 

                            Subpart B_Flight

 

Sec. 25.181  Dynamic stability.



    (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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