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280 

14 CFR Ch. I (1–1–24 Edition) 

§ 25.781 

Controls 

Motion and effect 

Flaps (or auxiliary lift 

devices).

Forward for flaps up; rearward for 

flaps down. 

Trim tabs (or equiva-

lent).

Rotate to produce similar rotation of 

the airplane about an axis parallel 
to the axis of the control. 

(b) Powerplant and auxiliary con-

trols: 

(1) 

Powerplant. 

Controls 

Motion and effect 

Power or thrust ............

Forward to increase forward thrust 

and rearward to increase rear-
ward thrust. 

Propellers ....................

Forward to increase rpm. 

Mixture .........................

Forward or upward for rich. 

Controls 

Motion and effect 

Carburetor air heat ......

Forward or upward for cold. 

Supercharger ...............

Forward or upward for low blower. 

For turbosuperchargers, forward, 
upward, or clockwise, to increase 
pressure. 

(2) 

Auxiliary. 

Controls 

Motion and effect 

Landing gear ...............

Down to extend. 

[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as 
amended by Amdt. 25–72, 55 FR 29778, July 20, 
1990] 

§ 25.781

Cockpit control knob shape. 

Cockpit control knobs must conform to the general shapes (but not necessarily 

the exact sizes or specific proportions) in the following figure: 

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281 

Federal Aviation Administration, DOT 

§ 25.783 

[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25–72, 55 FR 29779, July 20, 1990] 

§ 25.783

Fuselage doors. 

(a) 

General. This section applies to fu-

selage doors, which includes all doors, 
hatches, openable windows, access pan-
els, covers, etc., on the exterior of the 
fuselage that do not require the use of 
tools to open or close. This also applies 
to each door or hatch through a pres-
sure bulkhead, including any bulkhead 
that is specifically designed to func-

tion as a secondary bulkhead under the 
prescribed failure conditions of part 25. 
These doors must meet the require-
ments of this section, taking into ac-
count both pressurized and unpres-
surized flight, and must be designed as 
follows: 

(1) Each door must have means to 

safeguard against opening in flight as a 
result of mechanical failure, or failure 
of any single structural element. 

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