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SUBCHAPTER A—DEFINITIONS AND GENERAL 

REQUIREMENTS 

PART 1—DEFINITIONS AND 

ABBREVIATIONS 

Sec. 
1.1

General definitions. 

1.2

Abbreviations and symbols. 

1.3

Rules of construction. 

A

UTHORITY

: 49 U.S.C. 106(f), 106(g), 40113, 

44701. 

§ 1.1

General definitions. 

As used in Subchapters A through K 

of this chapter, unless the context re-
quires otherwise: 

Administrator 

means the Federal 

Aviation Administrator or any person 
to whom he has delegated his authority 
in the matter concerned. 

Aerodynamic coefficients means non- 

dimensional coefficients for aero-
dynamic forces and moments. 

Air carrier means a person who under-

takes directly by lease, or other ar-
rangement, to engage in air transpor-
tation. 

Air commerce means interstate, over-

seas, or foreign air commerce or the 
transportation of mail by aircraft or 
any operation or navigation of aircraft 
within the limits of any Federal airway 
or any operation or navigation of air-
craft which directly affects, or which 
may endanger safety in, interstate, 
overseas, or foreign air commerce. 

Aircraft  means a device that is used 

or intended to be used for flight in the 
air. 

Aircraft engine means an engine that 

is used or intended to be used for pro-
pelling aircraft. It includes turbo-
superchargers, appurtenances, and ac-
cessories necessary for its functioning, 
but does not include propellers. 

Airframe  means the fuselage, booms, 

nacelles, cowlings, fairings, airfoil sur-
faces (including rotors but excluding 
propellers and rotating airfoils of en-
gines), and landing gear of an aircraft 
and their accessories and controls. 

Airplane 

means an engine-driven 

fixed-wing aircraft heavier than air, 
that is supported in flight by the dy-
namic reaction of the air against its 
wings. 

Airport  means an area of land or 

water that is used or intended to be 
used for the landing and takeoff of air-
craft, and includes its buildings and fa-
cilities, if any. 

Airship means an engine-driven light-

er-than-air aircraft that can be steered. 

Air traffic means aircraft operating in 

the air or on an airport surface, exclu-
sive of loading ramps and parking 
areas. 

Air traffic clearance means an author-

ization by air traffic control, for the 
purpose of preventing collision between 
known aircraft, for an aircraft to pro-
ceed under specified traffic conditions 
within controlled airspace. 

Air traffic control means a service op-

erated by appropriate authority to pro-
mote the safe, orderly, and expeditious 
flow of air traffic. 

Air Traffic Service (ATS) route is a 

specified route designated for chan-
neling the flow of traffic as necessary 
for the provision of air traffic services. 
The term ‘‘ATS route’’ refers to a vari-
ety of airways, including jet routes, 
area navigation (RNAV) routes, and ar-
rival and departure routes. An ATS 
route is defined by route specifications, 
which may include: 

(1) An ATS route designator; 
(2) The path to or from significant 

points; 

(3) Distance between significant 

points; 

(4) Reporting requirements; and 
(5) The lowest safe altitude deter-

mined by the appropriate authority. 

Air transportation means interstate, 

overseas, or foreign air transportation 
or the transportation of mail by air-
craft. 

Alert Area. An alert area is estab-

lished to inform pilots of a specific 
area wherein a high volume of pilot 
training or an unusual type of aero-
nautical activity is conducted. 

Alternate airport means an airport at 

which an aircraft may land if a landing 
at the intended airport becomes inad-
visable. 

Altitude engine means a reciprocating 

aircraft engine having a rated takeoff 

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