[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: 14CFR23.49]



[Page 184-185]

 

                     TITLE 14--AERONAUTICS AND SPACE

 

CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION

 

PART 23_AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC, AND 

COMMUTER CATEGORY AIRPLANES--Table of Contents

 

                            Subpart B_Flight

 

Sec. 23.49  Stalling period.



    (a) VSO and VS1 are the stalling speeds or the 

minimum steady flight speeds,



[[Page 185]]



in knots (CAS), at which the airplane is controllable with--

    (1) For reciprocating engine-powered airplanes, the engine(s) 

idling, the throttle(s) closed or at not more than the power necessary 

for zero thrust at a speed not more than 110 percent of the stalling 

speed;

    (2) For turbine engine-powered airplanes, the propulsive thrust not 

greater than zero at the stalling speed, or, if the resultant thrust has 

no appreciable effect on the stalling speed, with engine(s) idling and 

throttle(s) closed;

    (3) The propeller(s) in the takeoff position;

    (4) The airplane in the condition existing in the test, in which 

VSO and VS1 are being used;

    (5) The center of gravity in the position that results in the 

highest value of VSO and VS1; and

    (6) The weight used when VSO and VS1 are being 

used as a factor to determine compliance with a required performance 

standard.

    (b) VSO and VS1 must be determined by flight 

tests, using the procedure and meeting the flight characteristics 

specified in Sec. 23.201.

    (c) Except as provided in paragraph (d) of this section, 

VSO and VS1 at maximum weight must not exceed 61 

knots for--

    (1) Single-engine airplanes; and

    (2) Multiengine airplanes of 6,000 pounds or less maximum weight 

that cannot meet the minimum rate of climb specified in Sec. 23.67(a) 

(1) with the critical engine inoperative.

    (d) All single-engine airplanes, and those multiengine airplanes of 

6,000 pounds or less maximum weight with a VSO of more than 

61 knots that do not meet the requirements of Sec. 23.67(a)(1), must 

comply with Sec. 23.562(d).



[Doc. No. 27807, 61 FR 5184, Feb. 9, 1996]