AMC 25.203 Stall characteristics

• ED Decision 2003/2/RM found in: CS-25 Amdt 27 - Large Aeroplanes (Jan 2023)

AMC 25.203 Stall characteristics ED Decision 2003/2/RM 1 *Static Longitudinal Stability during the Approach to the Stall.* During the approach to the stall the longitudinal control pull force should increase continuously as speed is reduced from the trimmed speed to the onset of stall warning. At lower speeds some reduction in longitudinal control pull force will be acceptable provided that it is not sudden or excessive. 2 *Rolling Motions at the Stall* 2.1 Where the stall is indicated by a nose-down pitch, this may be accompanied by a rolling motion that is not immediately controllable, provided that the rolling motion complies with [CS 25.203(b) or (c)](#_DxCrossRefBm1709820862) as appropriate. 2.2 In level wing stalls the bank angle may exceed 20° occasionally, provided that lateral control is effective during recovery. 3 *Deep Stall Penetration*. Where the results of wind tunnel tests reveal a risk of a catastrophic phenomenon (e.g. superstall, a condition at angles beyond the stalling incidence from which it proves difficult or impossible to recover the aeroplane), studies should be made to show that adequate recovery control is available at and sufficiently beyond the stalling incidence to avoid such a phenomenon.