[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: 14CFR27.173]



[Page 575]

 

                     TITLE 14--AERONAUTICS AND SPACE

 

CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION

 

PART 27_AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT--Table 

of Contents

 

                            Subpart B_Flight

 

Sec. 27.173  Static longitudinal stability.



    (a) The longitudinal control must be designed so that a rearward 

movement of the control is necessary to obtain a speed less than the 

trim speed, and a forward movement of the control is necessary to obtain 

a speed more than the trim speed.

    (b) With the throttle and collective pitch held constant during the 

maneuvers specified in Sec. 27.175 (a) through (c), the slope of the 

control position versus speed curve must be positive throughout the full 

range of altitude for which certification is requested.

    (c) During the maneuver specified in Sec. 27.175(d), the 

longitudinal control position versus speed curve may have a negative 

slope within the specified speed range if the negative motion is not 

greater than 10 percent of total control travel.



[Amdt. 27-21, 49 FR 44433, Nov. 6, 1984]