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A four-digit octal code identifying an aircraft to radar.
Also known as: Transponder code, Squawk
A squawk code is four digits, each from zero to seven, set on a transponder so radar can identify an aircraft. Three codes are reserved and known worldwide: seven five zero zero for hijack, seven six zero zero for radio failure, seven seven zero zero for emergency.
Identifies an aircraft to secondary surveillance radar, set as four octal digits on a transponder.
Contexts: Navigation
Reserves three codes internationally: hijack, radio failure and general emergency, each recognised without further communication.
Contexts: Navigation
Uses octal digits because the transponder encodes each digit in three bits, which is why no digit above seven appears.
Contexts: Navigation
Four numerals none higher than seven, displayed on a cockpit panel and read aloud on the radio.