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14 CFR Ch. I (1–1–14 Edition)
§ 25.1141
P
OWERPLANT
C
ONTROLS AND
A
CCESSORIES
§ 25.1141
Powerplant controls: general.
Each powerplant control must be lo-
cated, arranged, and designed under
§§ 25.777 through 25.781 and marked
under § 25.1555. In addition, it must
meet the following requirements:
(a) Each control must be located so
that it cannot be inadvertently oper-
ated by persons entering, leaving, or
moving normally in, the cockpit.
(b) Each flexible control must be ap-
proved or must be shown to be suitable
for the particular application.
(c) Each control must have sufficient
strength and rigidity to withstand op-
erating loads without failure and with-
out excessive deflection.
(d) Each control must be able to
maintain any set position without con-
stant attention by flight crewmembers
and without creep due to control loads
or vibration.
(e) The portion of each powerplant
control located in a designated fire
zone that is required to be operated in
the event of fire must be at least fire
resistant.
(f) For powerplant valve controls lo-
cated in the flight deck there must be
a means:
(1) For the flightcrew to select each
intended position or function of the
valve; and
(2) To indicate to the flightcrew:
(i) The selected position or function
of the valve; and
(ii) When the valve has not responded
as intended to the selected position or
function.
[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as
amended by Amdt. 25–40, 42 FR 15044, Mar. 17,
1977; Amdt. 25–72, 55 FR 29785, July 20, 1990;
Amdt. 25–115, 69 FR 40527, July 2, 2004]
§ 25.1142
Auxiliary power unit con-
trols.
Means must be provided on the flight
deck for starting, stopping, and emer-
gency shutdown of each installed auxil-
iary power unit.
[Amdt. 25–46, 43 FR 50598, Oct. 30, 1978]
§ 25.1143
Engine controls.
(a) There must be a separate power or
thrust control for each engine.
(b) Power and thrust controls must
be arranged to allow—
(1) Separate control of each engine;
and
(2) Simultaneous control of all en-
gines.
(c) Each power and thrust control
must provide a positive and imme-
diately responsive means of controlling
its engine.
(d) For each fluid injection (other
than fuel) system and its controls not
provided and approved as part of the
engine, the applicant must show that
the flow of the injection fluid is ade-
quately controlled.
(e) If a power or thrust control incor-
porates a fuel shutoff feature, the con-
trol must have a means to prevent the
inadvertent movement of the control
into the shutoff position. The means
must—
(1) Have a positive lock or stop at the
idle position; and
(2) Require a separate and distinct
operation to place the control in the
shutoff position.
[Amdt. 25–23, 35 FR 5677, Apr. 8, 1970, as
amended by Amdt. 25–38, 41 FR 55467, Dec. 20,
1976; Amdt. 25–57, 49 FR 6849, Feb. 23, 1984]
§ 25.1145
Ignition switches.
(a) Ignition switches must control
each engine ignition circuit on each
engine.
(b) There must be means to quickly
shut off all ignition by the grouping of
switches or by a master ignition con-
trol.
(c) Each group of ignition switches,
except ignition switches for turbine en-
gines for which continuous ignition is
not required, and each master ignition
control must have a means to prevent
its inadvertent operation.
[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as
amended by Amdt. 25–40, 42 FR 15044 Mar. 17,
1977]
§ 25.1147
Mixture controls.
(a) If there are mixture controls,
each engine must have a separate con-
trol. The controls must be grouped and
arranged to allow—
(1) Separate control of each engine;
and
(2) Simultaneous control of all en-
gines.
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