(b) For the purposes of this section—
(1) It may be assumed that takeoff power is used on all engines during the acceleration;
(2) Not more than 50 percent of the reported headwind component, or not less than 150 percent of the reported tailwind component, may be taken into account;
(3) The average runway gradient (the difference between the elevations of the endpoints of the runway divided by the total length) must be considered if it is more than one-half of one percent;
(4) It is assumed that the airplane is operating in standard atmosphere; and
(5) For takeoff, effective length of the runway means the distance from the end of the runway at which the takeoff is started to a point at which the obstruction clearance plane associated with the other end of the runway intersects the runway centerline.
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