air-to-ground tv system
51Ground speed — is the speed of an aircraft relative to the ground. It is the sum of the aircraft s true airspeed and the current wind and weather conditions; a headwind subtracts from the ground speed, while a tailwind adds to it. Winds at other angles to the… …
52Air India Flight 182 — Boeing 747 237B Emperor Kanishka landing at London Heathrow Airport on 10 June 1985, a few days before the explosion Occurrence summary …
53Air launch — Air launching is the practice of dropping a parasite aircraft, rocket, or missile from a mothership. The parasite aircraft or missile is usually is tucked under the wing of the larger mothership and then dropped from underneath the wing while in… …
54Air pollution in British Columbia — Air pollution is a concern in British Columbia (BC), Canada because of its effects on health and visibility. Air quality is influenced in BC by numerous mountain ranges and valleys, which complicate atmospheric pollution dispersion and can lead… …
55air traffic control — UK US noun [U] (ABBREVIATION ATC) TRANSPORT ► the activity of managing aircraft from the ground as they take off, fly, and land, or the people who do this: »an air traffic control centre/service/system air traffic controller noun [C] …
56air traffic controller — air traffic control UK US noun [U] (ABBREVIATION ATC) TRANSPORT ► the activity of managing aircraft from the ground as they take off, fly, and land, or the people who do this: »an air traffic control centre/service/system air traffic controller… …
57air-cushion machine — ▪ vehicle Introduction also called ground effect machine, or hovercraft, any of the machines characterized by movement in which a significant portion of the weight is supported by forces arising from air pressures developed around the… …
58Air traffic control radar beacon system — The air traffic control radar beacon system (ATCRBS) is a system used in air traffic control (ATC) to enhance radar monitoring and separation of air traffic. ATCRBS assists ATC radars by acquiring information about the aircraft being monitored,… …
59Air source heat pumps — An air source heat pump is a type of heat pump which use the outside air as a heat source or heat sink to heat or cool an interior space. Air source heat pumps are more efficient than oil, gas, and electric resistance heating in mild climates… …
60air warfare — Military operations conducted by airplanes, helicopters, or other aircraft against aircraft or targets on the ground and in the water. Air warfare did not become important until World War I (1914–18). The British, French, German, Russian, and… …
