A transponder is an electronic device on board an aircraft that responds to interrogation signals from air traffic control or collision-avoidance systems and broadcasts identification, altitude, and other coded data. In technical documentation, it appears in avionics system manuals, flight manuals, minimum equipment lists, and surveillance descriptions as part of communication, navigation, and airspace compliance, including mode and code selection procedures.
In localization, this term appears in AFM supplements, avionics manuals, operational flight plans, MEL deferrals, and airspace approval documents. Translators must keep standard ATC phraseology and transponder code terminology consistent, and distinguish transponder from ADS-B, radio, and radar because these systems may be translated similarly but have different regulatory meanings.
A common error is translating transponder as 'radar' or 'radio transmitter,' which misrepresents its role as an interrogated beacon rather than a primary radar source. Another is mistranslating mode or code terms such as Mode C, squawk, or ident, leading to incorrect operational instructions in flight crew or maintenance documents.
EASA and CE certification impose language requirements on maintenance and safety documentation. These terms carry airworthiness and liability implications, so they are rendered against the governing standard rather than translated freely.
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