spaschal on DSK3GDR082PROD with CFR

Federal Aviation Administration, DOT

Section 25.25

(2) Each requirement of this subpart,
except SectionSection 25.121(a), 25.123(c), 25.143(b)(1)
and (2), 25.149, 25.201(c)(2), 25.239, and
25.251(b) through (e), must be met in
the icing conditions specified in Appendix C of this part. Section 25.207(c) and
(d) must be met in the landing configuration in the icing conditions specified
in Appendix C, but need not be met for
other configurations. Compliance must
be shown using the ice accretions defined in part II of Appendix C of this
part, assuming normal operation of the
airplane and its ice protection system
in accordance with the operating limitations and operating procedures established by the applicant and provided in
the airplane flight manual.
(3) If the applicant does not seek certification for flight in all icing conditions defined in Appendix O of this
part, each requirement of this subpart,
except SectionSection 25.105, 25.107, 25.109, 25.111,
25.113, 25.115, 25.121, 25.123, 25.143(b)(1),
(b)(2), and (c)(1), 25.149, 25.201(c)(2),
25.207(c), (d), and (e)(1), 25.239, and
25.251(b) through (e), must be met in
the Appendix O icing conditions for
which certification is not sought in
order to allow a safe exit from those
conditions. Compliance must be shown
using the ice accretions defined in part
II, paragraphs (b) and (d) of Appendix
O, assuming normal operation of the
airplane and its ice protection system
in accordance with the operating limitations and operating procedures established by the applicant and provided in
the airplane flight manual.
(4) If the applicant seeks certification for flight in any portion of the
icing conditions of Appendix O of this
part, each requirement of this subpart,
except SectionSection 25.121(a), 25.123(c), 25.143(b)(1)
and (2), 25.149, 25.201(c)(2), 25.239, and
25.251(b) through (e), must be met in
the Appendix O icing conditions for
which certification is sought. Section
25.207(c) and (d) must be met in the
landing configuration in the Appendix
O icing conditions for which certification is sought, but need not be met
for other configurations. Compliance
must be shown using the ice accretions
defined in part II, paragraphs (c) and
(d) of Appendix O, assuming normal operation of the airplane and its ice protection system in accordance with the
operating limitations and operating

procedures established by the applicant
and provided in the airplane flight
manual.
[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as
amended by Amdt. 25-23, 35 FR 5671, Apr. 8,
1970; Amdt. 25-42, 43 FR 2320, Jan. 16, 1978;
Amdt. 25-72, 55 FR 29774, July 20, 1990; Amdt.
25-121, 72 FR 44665, Aug. 8, 2007 Amdt. 25-135,
76 FR 74654, Dec. 1, 2011; Amdt. 25-140, 79 FR
65524, Nov. 4, 2014]

Section 25.23 Load distribution limits.
(a) Ranges of weights and centers of
gravity within which the airplane may
be safely operated must be established.
If a weight and center of gravity combination is allowable only within certain load distribution limits (such as
spanwise) that could be inadvertently
exceeded, these limits and the corresponding weight and center of gravity combinations must be established.
(b) The load distribution limits may
not exceed - 
(1) The selected limits;
(2) The limits at which the structure
is proven; or
(3) The limits at which compliance
with each applicable flight requirement of this subpart is shown.
Section 25.25 Weight limits.
(a) Maximum weights. Maximum
weights corresponding to the airplane
operating conditions (such as ramp,
ground or water taxi, takeoff, en route,
and landing), environmental conditions
(such as altitude and temperature), and
loading conditions (such as zero fuel
weight, center of gravity position and
weight distribution) must be established so that they are not more than - 
(1) The highest weight selected by
the applicant for the particular conditions; or
(2) The highest weight at which compliance with each applicable structural
loading and flight requirement is
shown, except that for airplanes
equipped with standby power rocket
engines the maximum weight must not
be more than the highest weight established in accordance with appendix E of
this part; or
(3) The highest weight at which compliance is shown with the certification
requirements of Part 36 of this chapter.
(b) Minimum weight. The minimum
weight (the lowest weight at which

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