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7500: ICAO: Aircraft hijacking. [3] [7] 7501–7577 US: Reserved for use by Continental NORAD Region (CONR). [3] 7600: ICAO: Radio failure (lost communications). [3] [7] 7601–7607 US: Reserved for special use by FAA. [3] 7610–7676 US: External ARTCC subset (block of discrete codes). [3] 7615 Australia: Civil flights engaged in littoral zone ...
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 ...
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 is a general emergency. [22] For mode C, the altitude is encoded using Gillham code, using 11 bits. The lowest possible code is 000000000001, representing an altitude of -1200 feet.
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.
When the transponder receives an interrogation request, it broadcasts the configured transponder code (or "squawk code"). This is referred to as "Mode 3A" or more commonly, Mode A. A separate type of response called "Ident" can be initiated from the airplane by pressing a button on the transponder control panel.
In-flight radio failure may constitute an emergency, as determined by the pilot. Aircraft equipped with a transponder should indicate a NORDO situation by setting the appropriate transponder code: 7600 ("seven-six: radio fix"). NORDO aircraft declaring an emergency are given priority over other aircraft (providing a more serious emergency does ...
A Battery: Eveready 742: 1.5 V: Metal tabs H: 101.6 L: 63.5 W: 63.5 Used to provide power to the filament of a vacuum tube. B Battery: Eveready 762-S: 45 V: Threaded posts H: 146 L: 104.8 W: 63.5 Used to supply plate voltage in vintage vacuum tube equipment. Origin of the term B+ for plate voltage power supplies.
Do you want to move it? If not, I will. Perhaps we keep reference to the very few standard codes that are used everywhere (7700, 7600, 7500) and put the rest is a List of Transponder Codes page that make it clear these are local and/or historic codes. --Drpixie 02:29, 15 July 2018 (UTC) That sounds like a good approach.