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7700: ICAO: Emergency. [3] [7] 7701–7707 US: Reserved for special use by FAA. [3] 7710–7776 US: External ARTCC subset (block of discrete codes). [3] 7776 Europe The Mode A code 7776 is assigned as a test code by the ORCAM Users Group, specifically for the testing of transponders. [18] 7777 US, Germany, UK, Belgium, Netherlands
A discrete transponder code (often called a squawk code) is assigned by air traffic controllers to identify an aircraft uniquely in a flight information region (FIR). This allows easy identification of aircraft on radar. [6] [7] Codes are made of four octal digits; the dials on a transponder read from zero to seven, inclusive. Four octal digits ...
An equipment code describes the communication (COM), navigation (NAV), approach aids and surveillance transponder equipment on board an aircraft. These alphabetic codes are used on FAA and ICAO flight plan forms to aid flight service station (FSS) personnel in their handling of aircraft.
Hughes Airwest Flight 706 The wreckage of Hughes Airwest Flight 706 at its crash site Accident Date June 6, 1971 (1971-06-06) 18:11 (6:11 PM) PDT Summary Mid-air collision Site San Gabriel Mountains, Los Angeles County, California, United States 34°10′30″N 118°00′00″W / 34.175°N 118.00°W / 34.175; -118.00 Total fatalities 50 Total survivors 1 First aircraft N9345, the ...
Most general aviation aircraft in North America are told to "squawk 1200", meaning that they should set their transponder to 1200, whereas in the rest of the world, 7000 is used for this same purpose. Three special-purpose codes are also used, 7500 means the aircraft is being hijacked, 7600 means their voice radio set is not working, and 7700 ...
This was because the TCAS was disabled due to the electrical failure on EZY6074 and the TCAS needs to work on both aircraft to detect each other. Moments later, the pilots of EasyJet Flight 6074 managed to reconfigure their transponder and then a minute later, the code changed to the number 7700, or the General Emergency code number.
The transponder code was changed to 7600 (to indicate radio failure) at 15:09 UTC and subsequently to 7700 (emergency) at 15:26 UTC while on final approach. The secondary radio (VHF2) remained operative and the crew were able to restore communication with air traffic control (ATC) and made a pan-pan call on the emergency frequency.
They initiated emergency protocols, including squawking 7700 on the transponder, and redirected the flight over the Caspian Sea toward Kazakhstan. However, after the crash, the aircraft was found to be riddled with holes in its fuselage some containing fragments of foreign metal objects, damage inconsistent with a bird strike but resembling the ...