CS 25.231 Longitudinal stability and control

(a)Aeroplanes may have no uncontrollable tendency to nose over in any reasonably expected operating condition or when rebound occurs during landing or take-off. In addition –

(1)Wheel brakes must operate smoothly and may not cause any undue tendency to nose over; and

(2)If a tail-wheel landing gear is used, it must be possible, during the take-off ground run on concrete, to maintain any attitude up to thrust line level, at 75% of VSR1.