Originally Posted by
vilas
0% for twin And .5% for quad. Page 64, Getting To Grips with aircraft performance
CS 25.121 Climb: one-engineinoperative (See AMC 25.121) (a) Take-off; landing gear extended. (See AMC 25.121(a)) In the critical take-off configuration existing along the flight path (between the points at which the aeroplane reaches VLOF and at which the landing gear is fully retracted) and in the configuration used in CS 25.111 but without ground effect, the steady gradient of climb
must be positive for two engined aeroplanes, and not less than 0·3 % for three-engined aeroplanes or 0·5 % for fourengined aeroplanes, at VLOF and with – (1) The critical engine inoperative and the remaining engines at the power or thrust available when retraction of the landing gear is begun in accordance with CS 25.111 unless there is a more critical power operating condition existing later along the flight path but before the point at which the landing gear is fully retracted (see AMC 25.121(a)(1)); and (2) The weight equal to the weight existing when retraction of the landing gear is begun determined under CS 25.111.
Ref EASA CS-25 Amendment 19