Federal Aviation Administration, DOT

Section 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 passenger 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 takeoff 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, including any buildings and facilities.
Airport Operating Certificate means a
certificate, issued under this part, for
operation of a Class I, II, III, or IV airport.
Average daily departures means the
average number of scheduled departures per day of air carrier aircraft
computed on the basis of the busiest 3
consecutive calendar months of the immediately preceding 12 consecutive calendar months. However, if the average
daily departures are expected to increase, then  - average daily departures -  may be determined by planned
rather than current activity, in a manner authorized by the Administrator.
Certificate holder means the holder of
an Airport Operating Certificate issued
under this part.
Class I airport means an airport certificated to serve scheduled operations
of large air carrier aircraft that can
also serve unscheduled passenger operations of large air carrier aircraft and/
or scheduled operations of small air
carrier aircraft.
Class II airport means an airport certificated to serve scheduled operations
of small air carrier aircraft and the unscheduled passenger operations of large
air carrier aircraft. A Class II airport
cannot serve scheduled large air carrier
aircraft.
Class III airport means an airport certificated to serve scheduled operations
of small air carrier aircraft. A Class III
airport cannot serve scheduled or unscheduled large air carrier aircraft.

Class IV airport means an airport certificated to serve unscheduled passenger operations of large air carrier
aircraft. A Class IV airport cannot
serve scheduled large or small air carrier 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 helicopters.
Index means the type of aircraft rescue and firefighting equipment and
quantity of fire extinguishing agent
that the certificate holder must provide in accordance with Section 139.315.
Joint-use airport means an airport
owned by the Department of Defense,
at which both military and civilian aircraft 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 airport is located.
Safety area means a defined area comprised 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 excursion from a runway or the unintentional departure from a taxiway.
Scheduled operation means any common carriage passenger-carrying operation for compensation or hire conducted by an air carrier for which the
air carrier or its representatives offers
in advance the departure location, departure 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. Government-owned airport that is co-located with an airport specified under
Section 139.1(a) and at which portions of the

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