spaschal on DSK3GDR082PROD with CFR

Federal Aviation Administration, DOT

Section 25.113

(1) The slope of the airborne part of
the takeoff path must be positive at
each point;
(2) The airplane must reach V2 before
it is 35 feet above the takeoff surface
and must continue at a speed as close
as practical to, but not less than V2,
until it is 400 feet above the takeoff
surface;
(3) At each point along the takeoff
path, starting at the point at which the
airplane reaches 400 feet above the
takeoff surface, the available gradient
of climb may not be less than - 
(i) 1.2 percent for two-engine airplanes;
(ii) 1.5 percent for three-engine airplanes; and
(iii) 1.7 percent for four-engine airplanes.
(4) The airplane configuration may
not be changed, except for gear retraction and automatic propeller feathering, and no change in power or thrust
that requires action by the pilot may
be made until the airplane is 400 feet
above the takeoff surface; and
(5) If Section 25.105(a)(2) requires the takeoff
path to be determined for flight in
icing conditions, the airborne part of
the takeoff must be based on the airplane drag:
(i) With the most critical of the takeoff ice accretion(s) defined in Appendices C and O of this part, as applicable, in accordance with Section 25.21(g), from
a height of 35 feet above the takeoff
surface up to the point where the airplane is 400 feet above the takeoff surface; and
(ii) With the most critical of the final
takeoff ice accretion(s) defined in Appendices C and O of this part, as applicable, in accordance with Section 25.21(g),
from the point where the airplane is 400
feet above the takeoff surface to the
end of the takeoff path.
(d) The takeoff path must be determined by a continuous demonstrated
takeoff or by synthesis from segments.
If the takeoff path is determined by the
segmental method - 
(1) The segments must be clearly defined and must be related to the distinct changes in the configuration,
power or thrust, and speed;
(2) The weight of the airplane, the
configuration, and the power or thrust
must be constant throughout each seg-

ment and must correspond to the most
critical condition prevailing in the segment;
(3) The flight path must be based on
the airplane-s performance without
ground effect; and
(4) The takeoff path data must be
checked by continuous demonstrated
takeoffs up to the point at which the
airplane is out of ground effect and its
speed is stabilized, to ensure that the
path is conservative relative to the
continous path.
The airplane is considered to be out of
the ground effect when it reaches a
height equal to its wing span.
(e) For airplanes equipped with
standby power rocket engines, the
takeoff path may be determined in accordance with section II of appendix E.
[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as
amended by Amdt. 25-6, 30 FR 8468, July 2,
1965; Amdt. 25-42, 43 FR 2321, Jan. 16, 1978;
Amdt. 25-54, 45 FR 60172, Sept. 11, 1980; Amdt.
25-72, 55 FR 29774, July 20, 1990; Amdt. 25-94,
63 FR 8848, Feb. 23, 1998; Amdt. 25-108, 67 FR
70826, Nov. 26, 2002; Amdt. 25-115, 69 FR 40527,
July 2, 2004; Amdt. 25-121, 72 FR 44666; Aug.
8, 2007; Amdt. 25-140, 79 FR 65525, Nov. 4, 2014]

Section 25.113 Takeoff distance and takeoff
run.
(a) Takeoff distance on a dry runway
is the greater of - 
(1) The horizontal distance along the
takeoff path from the start of the takeoff to the point at which the airplane is
35 feet above the takeoff surface, determined under Section 25.111 for a dry runway;
or
(2) 115 percent of the horizontal distance along the takeoff path, with all
engines operating, from the start of the
takeoff to the point at which the airplane is 35 feet above the takeoff surface, as determined by a procedure consistent with Section 25.111.
(b) Takeoff distance on a wet runway
is the greater of - 
(1) The takeoff distance on a dry runway determined in accordance with
paragraph (a) of this section; or
(2) The horizontal distance along the
takeoff path from the start of the takeoff to the point at which the airplane is
15 feet above the takeoff surface,
achieved in a manner consistent with
the achievement of V2 before reaching

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