Goto Section: 87.3 | 87.17 | Table of Contents
Revised as of October 1, 2020
Goto Year:2019 |
§ 87.5 Definitions.
Aeronautical advisory station (unicom). An aeronautical station used
for advisory and civil defense communications primarily with private
Aeronautical enroute station. An aeronautical station which
communicates with aircraft stations in flight status or with other
aeronautical enroute stations.
Aeronautical fixed service. A radiocommunication service between
specified fixed points provided primarily for the safety of air
navigation and for the regular, efficient and economical operation of
air transport. A station in this service is an aeronautical fixed
Aeronautical Mobile Off-Route (OR) Service. An aeronautical mobile
service intended for communications, including those relating to flight
coordination, primarily outside national or international civil air
Aeronautical Mobile Route (R) Service. An aeronautical mobile service
reserved for communications relating to safety and regularity of
flight, primarily along national or international civil air routes.(RR)
Aeronautical Mobile-Satellite Off-Route (OR) Service. An aeronautical
mobile-satellite service intended for communications, including those
relating to flight coordination, primarily outside national and
international civil air routes.(RR)
Aeronautical Mobile-Satellite Route (R) Service. An aeronautical
mobile-satellite service reserved for communications relating to safety
and regularity of flights, primarily along national or international
civil air routes.(RR)
Aeronautical Mobile-Satellite Service. A mobile-satellite service in
which mobile earth stations are located on board aircraft.
Aeronautical mobile service. A mobile service between aeronautical
stations and aircraft stations, or between aircraft stations, in which
survival craft stations may also participate; emergency
position-indicating radiobeacon stations may also participate in this
service on designated distress and emergency frequencies.
Aeronautical multicom station. An aeronautical station used to provide
communications to conduct the activities being performed by, or
directed from, private aircraft.
Aeronautical radionavigation service. A radionavigation service
intended for the benefit and for the safe operation of aircraft.
Aeronautical search and rescue station. An aeronautical station for
communication with aircraft and other aeronautical search and rescue
stations pertaining to search and rescue activities with aircraft.
Aeronautical station. A land station in the aeronautical mobile
service. In certain instances an aeronautical station may be located,
for example, on board ship or on a platform at sea.
Aeronautical utility mobile station. A mobile station used on airports
for communications relating to vehicular ground traffic.
Air carrier aircraft station. A mobile station on board an aircraft
which is engaged in, or essential to, the transportation of passengers
or cargo for hire.
Aircraft data link system. A system used to provide data communications
between the aircraft and ground personnel necessary for the safe,
efficient and economic operation of the aircraft.
Aircraft data link land test station. A station which is used to test
and calibrate aircraft data link system communications equipment.
Aircraft earth station (AES). A mobile earth station in the
aeronautical mobile-satellite service located on board an aircraft.
Aircraft station. A mobile station in the aeronautical mobile service
other than a survival craft station, located on board an aircraft.
Air operations area. All airport areas where aircraft can operate,
either under their own power or while in tow. The airport operations
area includes runways, taxiways, apron areas, and all unpaved surfaces
within the airport's perimeter fence. An apron area is a surface in the
air operations area where aircraft park and are serviced (refueled,
loaded with cargo, and/or boarded by passengers).
Airport. An area of land or water that is used or intended to be used
for the landing and takeoff of aircraft, and includes its buildings and
facilities, if any.
Airport control tower (control tower) station. An aeronautical station
providing communication between a control tower and aircraft.
Automatic dependent surveillance--broadcast (ADS-B) Service. Broadcast
transmissions from aircraft, supporting aircraft-to-aircraft or
aircraft-to-ground surveillance applications, including position
reports, velocity vector, intent and other relevant information about
Automatic terminal information service-broadcast (ATIS-B). The
automatic provision of current, routine information to arriving and
departing aircraft throughout a 24-hour period or a specified portion
Automatic weather observation station (AWOS) or automatic surface
observation station (ASOS). A land station located at an airport and
used to automatically transmit weather information to aircraft.
Aviation service organization. Any business firm which maintains
facilities at an airport for the purposes of one or more of the
following general aviation activities:
(a) Aircraft fueling;
(b) Aircraft services (e.g. parking, storage, tie-downs);
(c) Aircraft maintenance or sales;
(d) Electronics equipment maintenance or sales;
(e) Aircraft rental, air taxi service or flight instructions; and
(f) Baggage and cargo handling, and other passenger or freight
Aviation services. Radio-communication services for the operation of
aircraft. These services include aeronautical fixed service,
aeronautical mobile service, aeronautical radiodetermination service,
and secondarily, the handling of public correspondence on frequencies
in the maritime mobile and maritime mobile satellite services to and
Aviation support station. An aeronautical station used to coordinate
aviation services with aircraft and to communicate with aircraft
engaged in unique or specialized activities. (See subpart K)
Differential GPS (DGPS). A system which transmits corrections to the
GPS derived position.
Emergency locator transmitter (ELT). A transmitter of an aircraft or a
survival craft actuated manually or automatically that is used as an
alerting and locating aid for survival purposes.
Emergency locator transmitter (ELT) test station. A land station used
for testing ELTs or for training in the use of ELTs.
Expendable Launch Vehicle (ELV). A booster rocket that can be used only
once to launch a payload, such as a missile or space vehicle.
Flight Information Service-Broadcast (FIS-B). A broadcast service
provided for the purpose of giving advice and information useful for
the safe and efficient conduct of flights.
Flight telemetering mobile station. A telemetering mobile station used
for transmitting data from an airborne vehicle, excluding data related
to airborne testing of the vehicle itself (or major components
Flight test aircraft station. An aircraft station used in the testing
of aircraft or their major components.
Flight test land station. An aeronautical station used in the testing
of aircraft or their major components.
Glide path station. A radionavigation land station which provides
vertical guidance to aircraft during approach to landing.
Instrument landing system (ILS). A radionavigation system which
provides aircraft with horizontal and vertical guidance just before and
during landing and, at certain fixed points, indicates the distance to
the reference point of landing.
Instrument landing system glide path. A system of vertical guidance
embodied in the instrument landing system which indicates the vertical
deviation of the aircraft from its optimum path of descent.
Instrument landing system localizer. A system of horizontal guidance
embodied in the instrument landing system which indicates the
horizontal deviation of the aircraft from its optimum path of descent
along the axis of the runway or along some other path when used as an
Land station. A station in the mobile service not intended to be used
while in motion.
Localizer station. A radionavigation land station which provides
horizontal guidance to aircraft with respect to a runway center line.
Marker beacon station. A radionavigation land station in the
aeronautical radionavigation service which employs a marker beacon. A
marker beacon is a transmitter which radiates vertically a distinctive
pattern for providing position information to aircraft.
Mean power (of a radio transmitter). The average power supplied to the
antenna transmission line by a transmitter during an interval of time
sufficiently long compared with the lowest frequency encountered in the
modulation taken under normal operating conditions.
Microwave landing system. An instrument landing system operating in the
microwave spectrum that provides lateral and vertical guidance to
aircraft having compatible avionics equipment.
Mobile service. A radiocommunication service between mobile and land
stations, or between mobile stations. A mobile station is intended to
be used while in motion or during halts at unspecified points.
Operational fixed station. A fixed station, not open to public
correspondence, operated by and for the sole use of persons operating
their own radiocommunication facilities in the public safety,
industrial, land transportation, marine, or aviation services.
Peak envelope power (of a radio transmitter). The average power
supplied to the antenna transmission line by a transmitter during one
radio frequency cycle at the crest of the modulation envelope taken
under normal operating conditions.
Private aircraft station. A mobile station on board an aircraft not
operated as an air carrier. A station on board an air carrier aircraft
weighing less than 12,500 pounds maximum certified takeoff gross weight
may be licensed as a private aircraft station.
Racon station. A radionavigation land station which employs a racon. A
racon (radar beacon) is a transmitter-receiver associated with a fixed
navigational mark, which when triggered by a radar, automatically
returns a distinctive signal which can appear on the display of the
triggering radar, providing range, bearing and identification
Radar. A radiodetermination system based upon the comparison of
reference signals with radio signals reflected, or re-transmitted, from
the position to be determined.
Radio altimeter. Radionavigation equipment, on board an aircraft or
spacecraft, used to determine the height of the aircraft or spacecraft
above the Earth's surface or another surface.
Radiobeacon station. A station in the radionavigation service the
emissions of which are intended to enable a mobile station to determine
its bearing or direction in relation to the radiobeacon station.
Radiodetermination service. A radiocommuncation service which uses
radiodetermination. Radiodetermination is the determination of the
position, velocity and/or other characteristics of an object, or the
obtaining of information relating to these parameters, by means of the
propagation of radio waves. A station in this service is called a
Radiolocation service. A radiodetermination service for the purpose of
radiolocation. Radiolocation is the use of radiodetermination for
purposes other than those of radionavigation.
Radionavigation land test stations. A radionavigation land station
which is used to transmit information essential to the testing and
calibration of aircraft navigational aids, receiving equipment, and
interrogators at predetermined surface locations. The Maintenance Test
Facility (MTF) is used primarily to permit maintenance testing by
aircraft radio service personnel. The Operational Test Facility (OTF)
is used primarily to permit the pilot to check a radionavigation system
aboard the aircraft prior to takeoff.
Radionavigation service. A radiodetermination service for the purpose
of radionavigation. Radionavigation is the use of radiodetermination
for the purpose of navigation, including obstruction warning.
Re-usable launch vehicle (RLV). A booster rocket that can be recovered
after launch, refurbished and re-launched.
Surveillance radar station. A radionavigation land station in the
aeronautical radionavigation service employing radar to detect the
presence of aircraft within its range.
Survival craft station. A mobile station in the maritime or
aeronautical mobile service intended solely for survival purposes and
located on any lifeboat, life raft or other survival equipment.
Traffic information services--broadcast (TIS-B). Traffic information
broadcasts derived from ground-based radar systems.
Universal access transceiver (UAT). A radio datalink system authorized
to operate on the frequency 978 MHz to support Automatic Dependent
Surveillance--Broadcast (ADS-B) Service, Traffic Information
Services--Broadcast (TIS-B) and Flight Information Service--Broadcast
VHF Omni directional range station (VOR). A radionavigation land
station in the aeronautical radionavigation service providing direct
indication of the bearing (omni-bearing) of that station from an
[ 53 FR 28940 , Aug. 1, 1988, as amended at 54 FR 11719 , Mar. 22, 1989;
54 FR 49995 , Dec. 4, 1989; 55 FR 4175 , Feb. 7, 1990; 57 FR 45749 , Oct.
5, 1992; 64 FR 27474 , May 20, 1999; 69 FR 32879 , June 14, 2004; 71 FR 70676 , Dec. 6, 2006; 78 FR 45074 , July 26, 2013; 78 FR 61205 , Oct. 3,
2013; 80 FR 38909 , July 7, 2015]
Subpart B--Applications and Licenses
Goto Section: 87.3 | 87.17
Goto Year: 2019 |
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