Section 25.1127

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

(2) Other means must be used to preclude the harmful contamination of the
ventilating air.
[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as
amended by Amdt. 25-38, 41 FR 55467, Dec. 20,
1976]

Section 25.1127 Exhaust driven turbo-superchargers.
(a) Each exhaust driven turbo-supercharger must be approved or shown to
be suitable for the particular application. It must be installed and supported to ensure safe operation between normal inspections and overhauls. In addition, there must be provisions for expansion and flexibility between exhaust conduits and the turbine.
(b) There must be provisions for lubricating the turbine and for cooling
turbine parts where temperatures are
critical.
(c) If the normal turbo-supercharger
control system malfunctions, the turbine speed may not exceed its maximum allowable value. Except for the
waste gate operating components, the
components provided for meeting this
requirement must be independent of
the normal turbo-supercharger controls.
POWERPLANT CONTROLS AND
ACCESSORIES

spaschal on DSK3GDR082PROD with CFR

Section 25.1141

Powerplant controls: general.

Each powerplant control must be located, arranged, and designed under
SectionSection 25.777 through 25.781 and marked
under Section 25.1555. In addition, it must
meet the following requirements:
(a) Each control must be located so
that it cannot be inadvertently operated by persons entering, leaving, or
moving normally in, the cockpit.
(b) Each flexible control must be approved or must be shown to be suitable
for the particular application.
(c) Each control must have sufficient
strength and rigidity to withstand operating loads without failure and without excessive deflection.
(d) Each control must be able to
maintain any set position without constant 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 located 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]

Section 25.1142 Auxiliary
trols.

power

unit

Means must be provided on the flight
deck for starting, stopping, and emergency shutdown of each installed auxiliary power unit.
[Amdt. 25-46, 43 FR 50598, Oct. 30, 1978]

Section 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 engines.
(c) Each power and thrust control
must provide a positive and immediately 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 adequately controlled.
(e) If a power or thrust control incorporates a fuel shutoff feature, the control 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

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