The aeroplane shall have such stability in relation to its other flight characteristics, performance, structural strength, and most probable operating conditions (e.g. aeroplane configur-ations and speed ranges) as to ensure that demands made on the pilot’s powers of concentration are not excessive when the stage of the flight at which these demands occur and their duration are taken into account. The stability of the aeroplane shall not, however, be such that excessive demands are made on the pilot’s strength or that the safety of the aeroplane is prejudiced by lack of manoeuvrability in emergency conditions.