Rotating beacon at the Alberta Aviation Museum

An aerodrome beacon or rotating beacon or aeronautical beacon is a beacon installed at an

airport An airport is an aerodrome with extended facilities, mostly for commercial air transport. Airports usually consists of a landing area, which comprises an aerially accessible open space including at least one operationally active surface ...

aerodrome An aerodrome (Commonwealth English) or airdrome (American English) is a location from which aircraft flight operations take place, regardless of whether they involve air cargo, passengers, or neither, and regardless of whether it is for publ ...

to indicate its location to aircraft pilots at night. An aerodrome beacon is mounted on top of a towering structure, often a

control tower Air traffic control (ATC) is a service provided by ground-based air traffic controllers who direct aircraft on the ground and through a given section of controlled airspace, and can provide advisory services to aircraft in non-controlled airsp ...

, above other buildings of the airport. It produces flashes similar to that of a

lighthouse A lighthouse is a tower, building, or other type of physical structure designed to emit light from a system of lamps and lenses and to serve as a beacon for navigational aid, for maritime pilots at sea or on inland waterways. Lighthouses mar ...

Airport An airport is an aerodrome with extended facilities, mostly for commercial air transport. Airports usually consists of a landing area, which comprises an aerially accessible open space including at least one operationally active surface ...

and heliport beacons are designed in such a way to make them most effective from one to ten degrees above the horizon; however, they can be seen well above and below this peak spread. The beacon may be an

omnidirectional Omnidirectional refers to the notion of existing in every direction. Omnidirectional devices include: * Omnidirectional antenna, an antenna that radiates equally in all directions * VHF omnidirectional range, a type of radio navigation system for ...

flashing xenon strobe, or it may be an aerobeacon rotating at a constant speed which produces the visual effect of flashes at regular intervals. Flashes may be of one, two, or three alternating colors ( described below).

In the United States

In the United States, the

Federal Aviation Administration The Federal Aviation Administration (FAA) is the largest transportation agency of the U.S. government and regulates all aspects of civil aviation in the country as well as over surrounding international waters. Its powers include air traffic m ...

(FAA) has established the following rules for airport beacons: Flashing rates # 24 to 30 per minute for beacons marking airports, landmarks, and points on Federal airways # 30 to 45 per minute for beacons marking heliports Color combinations # White and Green — Lighted land airport # Green alone* — Lighted land airport # White and Yellow — Lighted water airport # Yellow alone* — Lighted water airport # Green, Yellow, and White — Lighted heliport # White, White, Green** — Military Airport # White, Green, Amber — Hospital and/or Emergency Services Heliport :*Green alone or yellow alone is used only in connection with a white-and-green or white-and-yellow beacon display, respectively. :**Military airport beacons flash alternately white and green, but are differentiated from civil beacons by two quick white flashes between the green flashes. In

Class Class or The Class may refer to: Common uses not otherwise categorized * Class (biology), a taxonomic rank * Class (knowledge representation), a collection of individuals or objects * Class (philosophy), an analytical concept used differentl ...

B, C, D, and E surface areas, operation of the airport beacon between sunrise and sunset often indicates that the ground visibility is less than 3 miles and/or the

ceiling A ceiling is an overhead interior surface that covers the upper limits of a room. It is not generally considered a structural element, but a finished surface concealing the underside of the roof structure or the floor of a story above. Ceilings ...

is less than 1,000 feet. This is true particularly at locations where beacon controls are available to air traffic control personnel; however there is no regulation requiring daytime operation. At some locations with operating control towers, ATC personnel turn the beacon on or off with controls in the tower. At many airports the airport beacon is turned on by a

photoelectric cell A solar cell, or photovoltaic cell, is an electronic device that converts the energy of light directly into electricity by the photovoltaic effect, which is a physical and chemical phenomenon.

or time clocks, and ATC personnel cannot control them.

In Canada

In Canada, the regulations are different. Lighted aerodromes are equipped with white single flash beacons operating at a frequency of 20 to 30 flashes per minute. Heliports with beacons exhibit the morse letter H (4 short flashes) at a rate of 3 to 4 groups per minute.

Notes

{{reflist Air traffic control Beacons

In the United States

In Canada

See also

Notes