9/1/2015 AC 150/5210-20A
Appendix B
B-2
1.3.1 Accident–a collision between one aircraft or vehicle and another aircraft,
vehicle, person, or object that results in property damage, personal injury, or
death.
1.3.2 Air Carrier Apron–an apron for air carriers. Only authorized personnel and
vehicles may operate on this apron. Unauthorized vehicles and aircraft are
prohibited from operating on it.
1.3.3 Air Operations Area (AOA) – the air operations area includes paved or
unpaved areas used or intended to be used for the unobstructed movement of
aircraft, in addition to its associated runways, taxiways, or aprons. Commonly
refers to anything within the secured and fenced-in area of the airport.
1.3.4 Airport Traffic Control Tower (ATCT)–operated by an appropriate authority
to promote the safe, orderly, and expeditious flow of air traffic.
1.3.5 Aircraft–a device that is used or intended to be used for flight in the air.
1.3.6 Airport–(NAME) International Airport Facility, owned and operated by
(Airport Operator), including all improvements and equipment existing or to be
developed.
1.3.7 Apron–a defined area on an airport or heliport intended to accommodate
aircraft for the purposes of parking, loading and unloading passengers or cargo,
refueling, or maintenance.
1.3.8 Common Traffic Advisory Frequency (CTAF)–radio frequency designed for
the purpose of carrying out airport advisory practices while operating to or from
an airport without an operating ATCT or when the tower is closed. The CTAF
may be a UNICOM, MULTICOM, FSS, or tower frequency and is identified in
appropriate aeronautical publications. (See below for definitions of UNICOM,
MULTICOM, and FSS.)
1.3.9 Fixed-Based Operator (FBO)–a person, firm, or organization engaged in a
business that provides a range of basic services to general aviation. Services
may include the sale and dispensing of fuel, line services, aircraft parking and
tie-down, pilot and passenger facilities, airframe and power plant maintenance,
aircraft sales and rental, and pilot instruction.
1.3.10 Flight Service Station (FSS)–air traffic facilities that provide pilot briefings,
en route communications, and visual flight rules search and rescue services;
assist lost aircraft and aircraft in emergency situations; relay air traffic control
clearances; originate Notices to Airmen; broadcast aviation weather and
National Airspace System information; receive and process instrument flight
rules flight plans; and monitor NAVAIDs. In addition, at selected locations,
FSSs provide En Route Flight Advisory Service (Flight Watch), take weather
observations, issue airport advisories, and advise Customs and Immigration of
trans-border flights.
1.3.11 Foreign Object Debris (FOD)–debris that can cause damage to aircraft
engines, tires, or fuselage from rocks, trash, or the actual debris found on
runways, taxiways, and aprons.