CS 25.201 Stall demonstration

• ED Decision 2016/010/R found in: CS-25 Amdt 27 - Large Aeroplanes (Jan 2023)

CS 25.201 Stall demonstration ED Decision 2016/010/R (a) Stalls must be shown in straight flight and in 30° 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. (See [AMC 25.201(a)(2)](#_DxCrossRefBm1709820864).) (b) In each condition required by sub-paragraph (a) of this paragraph, it must be possible to meet the applicable requirements of [CS 25.203](#_DxCrossRefBm1709820862) with – (1) Flaps, landing gear and deceleration devices in any likely combination of positions approved for operation; (See [AMC 25.201(b)(1)](#_DxCrossRefBm1709820863).) (2) Representative weights within the range for which certification is requested; (3) The most adverse centre of gravity for recovery; and (4) The aeroplane trimmed for straight flight at the speed prescribed in [CS 25.103(b)(6)](#_DxCrossRefBm1709820692). (c) The following procedures must be used to show compliance with [CS 25.203](#_DxCrossRefBm1709820862): (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 does not exceed 0.5 m/s2 (one knot per second) until the aeroplane is stalled. (See [AMC 25.103(c)](#_DxCrossRefBm1709820739).) (2) In addition, for turning flight stalls, apply the longitudinal control to achieve airspeed deceleration rates up to 5,6 km/h (3 kt) per second. (See [AMC 25.201(c)(2)](#_DxCrossRefBm1709820861).) (3) As soon as the aeroplane is stalled, recover by normal recovery techniques. (d) The aeroplane is considered stalled when the behaviour of the aeroplane gives the pilot a clear and distinctive indication of an acceptable nature that the aeroplane is stalled. (See [AMC 25.201(d)](#_DxCrossRefBm1709820860).) 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. (See [AMC 25.201(d)(3)](#_DxCrossRefBm1709820859).) [Amdt 25/18]