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What is Avionics?

Avionics Shop Vinh Long Vietnam 1963-73

Avionics refers to electronic systems on aircraft, artificial satellites, and spacecraft that provide communications, navigation and guidance, display systems, flight management systems, sensors and indicators, weather radars, electrical systems, and various computers onboard modern aircraft and spacecraft.

It includes hundreds of systems fitted to aircraft to meet individual roles. These can be as simple as a search light for a police helicopter or as complicated as the tactical system for an airborne early warning platform. The word avionics is a combination of aviation and electronics.

Aircraft avionics

The cockpit of an aircraft is a major location for avionic equipment, including control, monitoring, communication, navigation, weather, and anti-collision systems. The majority of aircraft drive their avionics using 14 or 28 volt DCelectrical systems; however, large, more sophisticated aircraft (such asairlines or military combat aircraft) have AC systems operating at 115V 400 Hz, rather than the more common 50 and 60 Hz of European and North American, respectively, home electrical devices There are several major vendors of flight avionics, including Honeywell (which now owns BendixKing, Baker Electronics, Allied Signal, etc..), Rockwell Collins and Avidyne..

Communications connect the flight deck to the ground, and the flight deck to the passengers. On board communications are provided by public address systems and aircraft intercoms. The VHF aviation communication system works on the airbandf 118.000 MHz to 136.975 MHz. Each channel is spaced from the adjacent by 8.33 kHz. anplitude modulation (AM) is used. The conversation is performed by simplex mode. Aircraft communication can also take place using HF (especially for trans-oceanic flights) or satellite communication.

Navigatio is the determination of position and direction on or above the surface of the Earth. Avionics can use satellite-based systems (such as GPSand WAAS), ground-based systems (such as VOR orLORAN), or any combination thereof. Older avionics required a pilot or navigator to plot the intersection of signals on a paper map to determine an aircraft's location; modern systems, like the Bendix/King KLN 90B, calculate the position automatically and display it to the flight crew on moving map displays.