AMC2 CAT.POL.A.310 Take-off
obstacle clearance – multi-engined aeroplanes
TAKE-OFF FLIGHT PATH CONSTRUCTION
(a) For demonstrating that the aeroplane clears all obstacles vertically, a flight path should be constructed consisting of an all-engines segment to the assumed engine failure height, followed by an engine-out segment. Where the AFM does not contain the appropriate data, the approximation given in (b) may be used for the all-engines segment for an assumed engine failure height of 200 ft, 300 ft, or higher.
(b) Flight path construction
(1) All-engines segment (50 ft to 300 ft)
The average all-engines gradient for the all-engines flight path segment starting at an altitude of 50 ft at the end of the take-off distance ending at or passing through the 300 ft point is given by the following formula:
The factor of 0.77 as required by CAT.POL.A.310 is already included where:
Y300 = average all-engines gradient from 50 ft to 300 ft;
YERC = scheduled all engines en-route gross climb gradient;
VERC = en-route climb speed, all engines knots true airspeed (TAS);
V2 = take-off speed at 50 ft, knots TAS;
(2) All-engines segment (50 ft to 200 ft)
This may be used as an alternative to (b)(1) where weather minima permit. The average all-engines gradient for the all-engines flight path segment starting at an altitude of 50 ft at the end of the take-off distance ending at or passing through the 200 ft point is given by the following formula:
The factor of 0.77 as required by CAT.POL.A.310 is already included where:
Y200 = average all-engines gradient from 50 ft to 200 ft;
YERC = scheduled all engines en-route gross climb gradient;
VERC = en-route climb speed, all engines, knots TAS;
V2 = take-off speed at 50 ft, knots TAS.
(3) All-engines segment (above 300 ft)
The all-engines flight path segment continuing from an altitude of 300 ft is given by the AFM en-route gross climb gradient, multiplied by a factor of 0.77.
(4) The OEI flight path
The OEI flight path is given by the OEI gradient chart contained in the AFM.