Federal Aviation Administration, DOT

Section 25.1549

25.113, for weights, altitudes, temperatures, wind components, runway surface conditions (dry and wet), and runway gradients) for smooth, hard-surfaced runways. Additionally, at the option of the applicant, wet runway takeoff distances may be established for
runway surfaces that have been
grooved or treated with a porous friction course, and may be approved for
use on runways where such surfaces
have been designed constructed, and
maintained in a manner acceptable to
the Administrator.
(b) The extremes for variable factors
(such as altitude, temperature, wind,
and runway gradients) are those at
which compliance with the applicable
provisions of this part is shown.
(c) For airplanes certified in accordance with Section 25.1420(a)(1) or (2), an operating limitation must be established
to:
(1) Prohibit intentional flight, including takeoff and landing, into icing
conditions defined in Appendix O of
this part for which the airplane has not
been certified to safely operate; and
(2) Require exiting all icing conditions if icing conditions defined in Appendix O of this part are encountered
for which the airplane has not been
certified to safely operate.
[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as
amended by Amdt. 25-38, 41 FR 55468, Dec. 20,
1976; Amdt. 25-72, 55 FR 29786, July 20, 1990;
Amdt. 25-92, 63 FR 8321, Feb. 18, 1998; Amdt.
25-140, 79 FR 65528, Nov. 4, 2014]

Section 25.1535

ETOPS approval.

Except as provided in Section 25.3, each applicant seeking ETOPS type design approval must comply with the provisions of Appendix K of this part.
[Doc. No. FAA-2002-6717, 72 FR 1873, Jan. 16,
2007]

MARKINGS AND PLACARDS

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Section 25.1541

General.

(a) The airplane must contain - 
(1) The specified markings and placards; and
(2) Any additional information, instrument markings, and placards required for the safe operation if there
are unusual design, operating, or handling characteristics.

(b) Each marking and placard
scribed in paragraph (a) of this
tion - 
(1) Must be displayed in a
spicuous place; and
(2) May not be easily erased,
figured, or obscured.

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Section 25.1543 Instrument markings: general.
For each instrument - 
(a) When markings are on the cover
glass of the instrument, there must be
means to maintain the correct alignment of the glass cover with the face of
the dial; and
(b) Each instrument marking must
be clearly visible to the appropriate
crewmember.
[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as
amended by Amdt. 25-72, 55 FR 29786, July 20,
1990]

Section 25.1545 Airspeed limitation information.
The airspeed limitations required by
Section 25.1583 (a) must be easily read and understood by the flight crew.
Section 25.1547 Magnetic direction indicator.
(a) A placard meeting the requirements of this section must be installed
on, or near, the magnetic direction indicator.
(b) The placard must show the calibration of the instrument in level
flight with the engines operating.
(c) The placard must state whether
the calibration was made with radio receivers on or off.
(d) Each calibration reading must be
in terms of magnetic heading in not
more than 45 degree increments.
Section 25.1549 Powerplant and auxiliary
power unit instruments.
For each required powerplant and
auxiliary power unit instrument, as appropriate to the type of instrument - 
(a) Each maximum and, if applicable,
minimum safe operating limit must be
marked with a red radial or a red line;
(b) Each normal operating range
must be marked with a green arc or
green line, not extending beyond the
maximum and minimum safe limits;
(c) Each takeoff and precautionary
range must be marked with a yellow
arc or a yellow line; and

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