253 

Federal Aviation Administration, DOT 

§ 23.783 

(b) Powerplant control knobs must 

conform to the general shapes (but not 
necessarily the exact sizes or specific 
proportions) in the following figure: 

[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964; 30 
FR 258, Jan. 9, 1965, as amended by Amdt. 23– 
33, 51 FR 26657, July 24, 1986] 

§ 23.783

Doors. 

(a) Each closed cabin with passenger 

accommodations must have at least 
one adequate and easily accessible ex-
ternal door. 

(b) Passenger doors must not be lo-

cated with respect to any propeller 

disk or any other potential hazard so 
as to endanger persons using the door. 

(c) Each external passenger or crew 

door must comply with the following 
requirements: 

(1) There must be a means to lock 

and safeguard the door against inad-
vertent opening during flight by per-
sons, by cargo, or as a result of me-
chanical failure. 

(2) The door must be openable from 

the inside and the outside when the in-
ternal locking mechanism is in the 
locked position. 

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