![]() Mode C or S equipment is a mandatory requirement for many busy areas of controlled airspace. Mode S equipment has altitude capability and also permits data exchange.Mode C equipment enables the ATCO to see the aircraft altitude or flight level automatically.Mode A equipment transmits an identifying code only.Mode A, C, S and IdentĬivil aircraft may be equipped with transponders capable of operating in different modes: This could include the availability of suitable display of surveillance information on a consolidated display in the form of a moving map in flight decks and in surface vehicles. airport Multilateration, Surface Movement Radars and Automatic Dependent Surveillance Broadcast (ADS-B), enables A-SMGCS systems and integrated airport operations. Furthermore at certain airports, a locally-optimised mix of available technologies, i.e. A number of large airports have included information in the Automatic Terminal Information Service (ATIS) broadcasts when the transponder is required to be active for taxi operations. Special codes are used in emergency, as follows:Ĭurrently there are systems such as Airport Surface Detection Equipment–Model X ( Airport Surface Detection Equipment, Model X (ASDE-X)) and Advanced Surface Movement Guidance and Control System ( Advanced Surface Movement Guidance and Control System) which use transponder returns from both aircraft and of airport service vehicles with installed transponders to improve safety and efficiency the surface movement control. ![]() Details of standard codes in different countries may be found in national Aeronautical Information Publications (AIPs). It is now standard practice to allocate a specific transponder code to each aircraft flying in controlled airspace so that the ATCO can readily identify a specific aircraft on a crowded radar screen, using SSR (Secondary Surveillance Radar).īy international agreement, 2000 is used for aircraft which have not been assigned a transponder code, although in some parts of Europe, 7000 is used for this purpose. Subsequently, transponders have come into widespread use in civil as well as military aviation.
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