AMC 25.253(a)(4) Lateral Control: Roll Capability

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

AMC 25.253(a)(4) Lateral Control: Roll Capability ED Decision 2003/2/RM An acceptable method of demonstrating compliance with [CS 25.253(a)(4)](#_DxCrossRefBm1709820696) is as follows: 1 Establish a steady 20° banked turn at a speed close to VDF/MDF limited to the extent necessary to accomplish the following manoeuvre and recovery without exceeding VDF/MDF. Using lateral control alone, it should be demonstrated that the aeroplane can be rolled to 20° bank angle in the other direction in not more than 8 seconds. The demonstration should be made in the most adverse direction. The manoeuvre may be unchecked. 2 For aeroplanes that exhibit an adverse effect on roll rate when rudder is used, it should also be demonstrated that use of rudder in a conventional manner will not result in a roll capability significantly below that specified above. 3 Conditions for 1 and 2: Wing-flaps retracted. Speedbrakes retracted and extended. Landing gear retracted. Trim. The aeroplane trimmed for straight flight at VMO/MMO. The trimming controls should not be moved during the manoeuvre. Power: (i) All engines operating at the power required to maintain level flight at VMO/MMO, except that maximum continuous power need not be exceeded; and (ii) if the effect of power is significant, with the throttles closed.