[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: 14CFR25.201]



[Page 364-365]

 

                     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. 25.201  Stall demonstration.



    (a) Stalls must be shown in straight flight and in 30 degree banked 

turns with--

    (1) Power off; and

    (2) The power necessary to maintain level flight at 1.5 VSR1 (where 

VSR1 corresponds to the reference stall speed at maximum landing weight 

with flaps in the approach position and the landing gear retracted).

    (b) In each condition required by paragraph (a) of this section, it 

must be possible to meet the applicable requirements of Sec. 25.203 

with--

    (1) Flaps, landing gear, and deceleration devices in any likely 

combination of positions approved for operation;

    (2) Representative weights within the range for which certification 

is requested;

    (3) The most adverse center of gravity for recovery; and

    (4) The airplane trimmed for straight flight at the speed prescribed 

in Sec. 25.103(b)(6).

    (c) The following procedures must be used to show compliance with 

Sec. 25.203;

    (1) Starting at a speed sufficiently above the stalling speed to 

ensure that a steady rate of speed reduction can be established, apply 

the longitudinal control so that the speed reduction



[[Page 365]]



does not exceed one knot per second until the airplane is stalled.

    (2) In addition, for turning flight stalls, apply the longitudinal 

control to achieve airspeed deceleration rates up to 3 knots per second.

    (3) As soon as the airplane is stalled, recover by normal recovery 

techniques.

    (d) The airplane is considered stalled when the behavior of the 

airplane gives the pilot a clear and distinctive indication of an 

acceptable nature that the airplane is stalled. Acceptable indications 

of a stall, occurring either individually or in combination, are--

    (1) A nose-down pitch that cannot be readily arrested;

    (2) Buffeting, of a magnitude and severity that is a strong and 

effective deterrent to further speed reduction; or

    (3) The pitch control reaches the aft stop and no further increase 

in pitch attitude occurs when the control is held full aft for a short 

time before recovery is initiated.



[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25-84, 

60 FR 30750, June 9, 1995; Amdt. 25-108, 67 FR 70827, Nov. 26, 2002]