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14 CFR Ch. I (1–1–24 Edition) 

§ 25.1145 

(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. 

(b) Each intermediate position of the 

mixture controls that corresponds to a 
normal operating setting must be iden-
tifiable by feel and sight. 

(c) The mixture controls must be ac-

cessible to both pilots. However, if 
there is a separate flight engineer sta-
tion with a control panel, the controls 
need be accessible only to the flight en-
gineer. 

§ 25.1149

Propeller speed and pitch 

controls. 

(a) There must be a separate pro-

peller speed and pitch control for each 
propeller. 

(b) The controls must be grouped and 

arranged to allow— 

(1) Separate control of each pro-

peller; and 

(2) Simultaneous control of all pro-

pellers. 

(c) The controls must allow synchro-

nization of all propellers. 

(d) The propeller speed and pitch con-

trols must be to the right of, and at 
least one inch below, the pilot’s throt-
tle controls. 

§ 25.1153

Propeller feathering controls. 

(a) There must be a separate pro-

peller feathering control for each pro-
peller. The control must have means to 
prevent its inadvertent operation. 

(b) If feathering is accomplished by 

movement of the propeller pitch or 
speed control lever, there must be 
means to prevent the inadvertent 
movement of this lever to the feath-
ering position during normal oper-
ation. 

[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as 
amended by Amdt. 25–11, 32 FR 6913, May 5, 
1967] 

§ 25.1155

Reverse thrust and propeller 

pitch settings below the flight re-
gime. 

Each control for reverse thrust and 

for propeller pitch settings below the 
flight regime must have means to pre-
vent its inadvertent operation. The 
means must have a positive lock or 
stop at the flight idle position and 
must require a separate and distinct 
operation by the crew to displace the 
control from the flight regime (forward 
thrust regime for turbojet powered air-
planes). 

[Amdt. 25–11, 32 FR 6913, May 5, 1967] 

§ 25.1157

Carburetor air temperature 

controls. 

There must be a separate carburetor 

air temperature control for each en-
gine. 

§ 25.1159

Supercharger controls. 

Each supercharger control must be 

accessible to the pilots or, if there is a 
separate flight engineer station with a 
control panel, to the flight engineer. 

§ 25.1161

Fuel jettisoning system con-

trols. 

Each fuel jettisoning system control 

must have guards to prevent inad-
vertent operation. No control may be 
near any fire extinguisher control or 
other control used to combat fire. 

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