331 

Federal Aviation Administration, DOT 

§ 25.1143 

(2) Other means must be used to pre-

clude 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] 

§ 25.1127

Exhaust driven turbo-super-

chargers. 

(a) Each exhaust driven turbo-super-

charger must be approved or shown to 
be suitable for the particular applica-
tion. It must be installed and sup-
ported to ensure safe operation be-
tween normal inspections and over-
hauls. In addition, there must be provi-
sions for expansion and flexibility be-
tween exhaust conduits and the tur-
bine. 

(b) There must be provisions for lu-

bricating the turbine and for cooling 
turbine parts where temperatures are 
critical. 

(c) If the normal turbo-supercharger 

control system malfunctions, the tur-
bine speed may not exceed its max-
imum allowable value. Except for the 
waste gate operating components, the 
components provided for meeting this 
requirement must be independent of 
the normal turbo-supercharger con-
trols. 

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 

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