Section 25.115

14 CFR Ch. I (1-1-19 Edition)

35 feet above the takeoff surface, determined under Section 25.111 for a wet runway.
(c) If the takeoff distance does not include a clearway, the takeoff run is
equal to the takeoff distance. If the
takeoff distance includes a clearway - 
(1) The takeoff run on a dry runway
is the greater of - 
(i) The horizontal distance along the
takeoff path from the start of the takeoff to a point equidistant between the
point at which VLOF is reached and the
point at which the airplane is 35 feet
above the takeoff surface, as determined under Section 25.111 for a dry runway;
or
(ii) 115 percent of the horizontal distance along the takeoff path, with all
engines operating, from the start of the
takeoff to a point equidistant between
the point at which VLOF is reached and
the point at which the airplane is 35
feet above the takeoff surface, determined by a procedure consistent with
Section 25.111.
(2) The takeoff run on a wet runway
is the greater of - 
(i) 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
35 feet above the takeoff surface, as determined under Section 25.111 for a wet runway; or
(ii) 115 percent of the horizontal distance along the takeoff path, with all
engines operating, from the start of the
takeoff to a point equidistant between
the point at which VLOF is reached and
the point at which the airplane is 35
feet above the takeoff surface, determined by a procedure consistent with
Section 25.111.

spaschal on DSK3GDR082PROD with CFR

[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as
amended by Amdt. 25-23, 35 FR 5671, Apr. 8,
1970; Amdt. 25-92, 63 FR 8320, Feb. 18, 1998]

Section 25.115 Takeoff flight path.
(a) The takeoff flight path shall be
considered to begin 35 feet above the
takeoff surface at the end of the takeoff distance determined in accordance
with Section 25.113(a) or (b), as appropriate for
the runway surface condition.
(b) The net takeoff flight path data
must be determined so that they represent the actual takeoff flight paths

(determined in accordance with Section 25.111
and with paragraph (a) of this section)
reduced at each point by a gradient of
climb equal to - 
(1) 0.8 percent for two-engine airplanes;
(2) 0.9 percent for three-engine airplanes; and
(3) 1.0 percent for four-engine airplanes.
(c) The prescribed reduction in climb
gradient may be applied as an equivalent reduction in acceleration along
that part of the takeoff flight path at
which the airplane is accelerated in
level flight.
[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as
amended by Amdt. 25-92, 63 FR 8320, Feb. 18,
1998]

Section 25.117 Climb: general.
Compliance with the requirements of
SectionSection 25.119 and 25.121 must be shown at
each weight, altitude, and ambient
temperature within the operational
limits established for the airplane and
with the most unfavorable center of
gravity for each configuration.
Section 25.119 Landing climb: All-engines-operating.
In the landing configuration, the
steady gradient of climb may not be
less than 3.2 percent, with the engines
at the power or thrust that is available
8 seconds after initiation of movement
of the power or thrust controls from
the minimum flight idle to the goaround power or thrust setting - 
(a) In non-icing conditions, with a
climb speed of VREF determined in accordance with Section 25.125(b)(2)(i); and
(b) In icing conditions with the most
critical of the landing ice accretion(s)
defined in Appendices C and O of this
part, as applicable, in accordance with
Section 25.21(g), and with a climb speed of
VREF determined in accordance with
Section 25.125(b)(2)(ii).
[Amdt. 25-121, 72 FR 44666; Aug. 8, 2007, as
amended by Amdt. 25-,140, 79 FR 65525, Nov.
4, 2014]

Section 25.121 Climb:
One-engine-inoperative.
(a) Takeoff; landing gear extended. In
the critical takeoff configuration existing along the flight path (between the
points at which the airplane reaches

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