555 

Federal Aviation Administration, DOT 

§ 139.5 

Air carrier aircraft 

means an aircraft 

that is being operated by an air carrier 
and is categorized as either a large air 
carrier aircraft if designed for at least 
31 passenger seats or a small air carrier 
aircraft if designed for more than 9 pas-
senger seats but less than 31 passenger 
seats, as determined by the aircraft 
type certificate issued by a competent 
civil aviation authority. 

Air carrier operation 

means the take-

off or landing of an air carrier aircraft 
and includes the period of time from 15 
minutes before until 15 minutes after 
the takeoff or landing. 

Airport 

means an area of land or 

other hard surface, excluding water, 
that is used or intended to be used for 
the landing and takeoff of aircraft, in-
cluding any buildings and facilities. 

Airport Operating Certificate 

means a 

certificate, issued under this part, for 
operation of a Class I, II, III, or IV air-
port. 

Average daily departures 

means the 

average number of scheduled depar-
tures per day of air carrier aircraft 
computed on the basis of the busiest 3 
consecutive calendar months of the im-
mediately preceding 12 consecutive cal-
endar months. However, if the average 
daily departures are expected to in-
crease, then ‘‘average daily depar-
tures’’ may be determined by planned 
rather than current activity, in a man-
ner authorized by the Administrator. 

Certificate holder 

means the holder of 

an Airport Operating Certificate issued 
under this part. 

Class I airport 

means an airport cer-

tificated to serve scheduled operations 
of large air carrier aircraft that can 
also serve unscheduled passenger oper-
ations of large air carrier aircraft and/ 
or scheduled operations of small air 
carrier aircraft. 

Class II airport 

means an airport cer-

tificated to serve scheduled operations 
of small air carrier aircraft and the un-
scheduled passenger operations of large 
air carrier aircraft. A Class II airport 
cannot serve scheduled large air carrier 
aircraft. 

Class III airport 

means an airport cer-

tificated to serve scheduled operations 
of small air carrier aircraft. A Class III 
airport cannot serve scheduled or un-
scheduled large air carrier aircraft. 

Class IV airport 

means an airport cer-

tificated to serve unscheduled pas-
senger operations of large air carrier 
aircraft. A Class IV airport cannot 
serve scheduled large or small air car-
rier aircraft. 

Clean agent 

means an electrically 

nonconducting volatile or gaseous fire 
extinguishing agent that does not leave 
a residue upon evaporation and has 
been shown to provide extinguishing 
action equivalent to halon 1211 under 
test protocols of FAA Technical Report 
DOT/FAA/AR–95/87. 

Heliport 

means an airport, or an area 

of an airport, used or intended to be 
used for the landing and takeoff of heli-
copters. 

Index 

means the type of aircraft res-

cue and firefighting equipment and 
quantity of fire extinguishing agent 
that the certificate holder must pro-
vide in accordance with § 139.315. 

Joint-use airport 

means an airport 

owned by the Department of Defense, 
at which both military and civilian air-
craft make shared use of the airfield. 

Movement area 

means the runways, 

taxiways, and other areas of an airport 
that are used for taxiing, takeoff, and 
landing of aircraft, exclusive of loading 
ramps and aircraft parking areas. 

Regional Airports Division Manager 

means the airports division manager 
for the FAA region in which the air-
port is located. 

Safety area 

means a defined area com-

prised of either a runway or taxiway 
and the surrounding surfaces that is 
prepared or suitable for reducing the 
risk of damage to aircraft in the event 
of an undershoot, overshoot, or excur-
sion from a runway or the uninten-
tional departure from a taxiway. 

Scheduled operation 

means any com-

mon carriage passenger-carrying oper-
ation for compensation or hire con-
ducted by an air carrier for which the 
air carrier or its representatives offers 
in advance the departure location, de-
parture time, and arrival location. It 
does not include any operation that is 
conducted as a supplemental operation 
under 14 CFR part 121 or public charter 
operations under 14 CFR part 380. 

Shared-use airport 

means a U.S. Gov-

ernment-owned airport that is co-lo-
cated with an airport specified under 
§ 139.1(a) and at which portions of the 

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