Code of Federal Regulations - Title 14

495

Federal Aviation Administration, DOT

§ 25.1303

all of the tasks associated with the sys-
tems’ and equipment’s intended func-
tions. Such installed equipment and
systems must meet the following re-
quirements:

(a) Flight deck controls must be in-

stalled to allow accomplishment of all
the tasks required to safely perform
the equipment’s intended function, and
information must be provided to the
flightcrew that is necessary to accom-
plish the defined tasks.

(b) Flight deck controls and informa-

tion intended for the flightcrew’s use
must:

(1) Be provided in a clear and unam-

biguous manner at a resolution and
precision appropriate to the task;

(2) Be accessible and usable by the

flightcrew in a manner consistent with
the urgency, frequency, and duration of
their tasks; and

(3) Enable flightcrew awareness, if

awareness is required for safe oper-
ation, of the effects on the airplane or
systems resulting from flightcrew ac-
tions.

of the installed equipment must be:

(1) Predictable and unambiguous; and
(2) Designed to enable the flightcrew

to intervene in a manner appropriate
to the task.

(d) To the extent practicable, in-

stalled equipment must incorporate
means to enable the flightcrew to man-
age errors resulting from the kinds of
flightcrew interactions with the equip-
ment that can be reasonably expected
in service. This paragraph does not
apply to any of the following:

(1) Skill-related errors associated

with manual control of the airplane;

(2) Errors that result from decisions,

actions, or omissions committed with
malicious intent;

(3) Errors arising from a crew-

member’s reckless decisions, actions,
or omissions reflecting a substantial
disregard for safety; and

(4) Errors resulting from acts or

threats of violence, including actions
taken under duress.

[Doc. No. FAA–2010–1175, 78 FR 25846, May 3,
2013]

§ 25.1303

Flight and navigation instru-

ments.

(a) The following flight and naviga-

tion instruments must be installed so
that the instrument is visible from
each pilot station:

(1) A free air temperature indicator

or an air-temperature indicator which
provides indications that are convert-
ible to free-air temperature.

(2) A clock displaying hours, min-

utes, and seconds with a sweep-second
pointer or digital presentation.

(3) A direction indicator (non-

stabilized magnetic compass).

(b) The following flight and naviga-

tion instruments must be installed at
each pilot station:

(1) An airspeed indicator. If airspeed

limitations vary with altitude, the in-
dicator must have a maximum allow-
able airspeed indicator showing the
variation of V

with altitude.

(2) An altimeter (sensitive).
(3) A rate-of-climb indicator (vertical

speed).

(4) A gyroscopic rate-of-turn indi-

cator combined with an integral slip-
skid indicator (turn-and-bank indi-
cator) except that only a slip-skid indi-
cator is required on large airplanes
with a third attitude instrument sys-
tem useable through flight attitudes of
360

of pitch and roll and installed in

accordance with § 121.305(k) of this
title.

(5) A bank and pitch indicator (gyro-

scopically stabilized).

(6) A direction indicator (gyroscop-

ically stabilized, magnetic or non-
magnetic).

tion instruments are required as pre-
scribed in this paragraph:

(1) A speed warning device is required

for turbine engine powered airplanes
and for airplanes with V

greater

than 0.8 V

or 0.8 V

The

speed warning device must give effec-
tive aural warning (differing distinc-
tively from aural warnings used for
other purposes) to the pilots, whenever
the speed exceeds V

plus 6 knots or

+0.01. The upper limit of the pro-

duction tolerance for the warning de-
vice may not exceed the prescribed
warning speed.

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