{"id":61699,"date":"2017-01-18T22:27:11","date_gmt":"2017-01-18T22:27:11","guid":{"rendered":"https:\/\/www.stratosjets.com\/?p=61699"},"modified":"2023-11-23T10:27:50","modified_gmt":"2023-11-23T10:27:50","slug":"glossarycharter-aircraft-transponder","status":"publish","type":"post","link":"https:\/\/www.stratosjets.com\/glossary\/charter-aircraft-transponder\/","title":{"rendered":"Transponder"},"content":{"rendered":"<p>In aviation, a transponder (short for transmitter-responder) is a radar beacon equipped on an aircraft. It emits and receives radio signals. It is a useful tool that allows air traffic controllers to locate and monitor the whereabouts of individual charter plane travelling within their airspace using radar.<\/p>\n<p>While a primary radar system can detect the location and bearing of an aircraft, it is unable to determine altitude. Instead, air traffic controllers use secondary surveillance radar (SSR) to emit a signal that\u2019s picked up by the transponder on a charter plane. In turn, the transponder responds with this additional information.<\/p>\n<p>In addition to transmitting location information to air traffic control, transponders are also a key component of collision avoidance systems.<\/p>\n<h2>Squawking Transponder Codes<\/h2>\n<p>To assist air traffic controllers in identifying individual charter planes on their radar screens, transponders can transmit what are referred to as transponder codes. These are four-digit codes using the numbers zero to seven, inclusive. Therefore, these codes can range from 0000 to 7777. In total, there are 4096 potential codes using this system.<\/p>\n<p>To assign a transponder code to a charter plane, air traffic control will ask the pilot to \u2018squawk\u2019 a code. Once the code is transmitted, it allows the controller to easily identify the aircraft on the radar screen.<\/p>\n<p>In addition to identifying aircraft, pilots can use transponder codes to transmit other important information:<\/p>\n<ul>\n<li>1200: aircraft is flying VFR<\/li>\n<li>7500: aircraft has been hijacked<\/li>\n<li>7600: aircraft has lost radio communication<\/li>\n<li>7700: aircraft is in a state of emergency<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>In aviation, a transponder (short for transmitter-responder) is a radar beacon equipped on an aircraft.","protected":false},"author":2,"featured_media":60982,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[1402],"tags":[978],"acf":[],"_links":{"self":[{"href":"https:\/\/www.stratosjets.com\/wp-json\/wp\/v2\/posts\/61699"}],"collection":[{"href":"https:\/\/www.stratosjets.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.stratosjets.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.stratosjets.com\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.stratosjets.com\/wp-json\/wp\/v2\/comments?post=61699"}],"version-history":[{"count":1,"href":"https:\/\/www.stratosjets.com\/wp-json\/wp\/v2\/posts\/61699\/revisions"}],"predecessor-version":[{"id":94078,"href":"https:\/\/www.stratosjets.com\/wp-json\/wp\/v2\/posts\/61699\/revisions\/94078"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.stratosjets.com\/wp-json\/wp\/v2\/media\/60982"}],"wp:attachment":[{"href":"https:\/\/www.stratosjets.com\/wp-json\/wp\/v2\/media?parent=61699"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.stratosjets.com\/wp-json\/wp\/v2\/categories?post=61699"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.stratosjets.com\/wp-json\/wp\/v2\/tags?post=61699"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}