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VFR flight above 10,000' MSL when no other code has been assigned. [citation needed] US: External ARTCC subset. (Block of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.) [3] 1500 US: Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2.
Provides 2-digit 5-bit mission code (cockpit selectable) [1] 2: Provides 4-digit octal unit code (set on ground for fighters, can be changed in flight by transport aircraft) [1] 3: A: Provides a 4-digit octal identification code for the aircraft, set in the cockpit but assigned by the air traffic controller. Mode 3/A is often combined with Mode ...
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 ...
Mode 1: military only; provides 2-digit octal (6 bit) "mission code" that identifies the aircraft type or mission. [21] Mode 2: military only; provides 4-digit octal (12 bit) unit code or tail number. [22] Mode 3/A: military/civilian; provides a 4-digit octal (12 bit) identification code for the aircraft, assigned by the air traffic controller.
The transponder has a small required set of controls and is simple to operate. It has a method to enter the four-digit transponder code, also known as a beacon code or squawk code, and a control to transmit an ident, which is done at the controller's request (see SPI pulse below). Transponders typically have 4 operating modes: Off, Standby, On ...
These codes are defined by both the International Civil Aviation Organization (ICAO) and the International Air Transport Association (IATA). ICAO codes are published in ICAO Document 8643 Aircraft Type Designators [1] and are used by air traffic control and airline operations such as flight planning. While ICAO designators are used to ...
Transponder code, the transponder code that must be set for the aircraft prior to departure and during the flight. T also stands for time, as in void time, if one is issued. A void time is an expiration time, meaning, the IFR clearance is voided if the aircraft is not airborne by the void time. [1]
These alphabetic codes are used on FAA and ICAO flight plan forms to aid flight service station (FSS) personnel in their handling of aircraft. On the FAA domestic flight plan form (FAA Form 7233-1) the equipment code is a single character placed in block 3 (Aircraft Type / Special Equipment) as a suffix to the aircraft type code. A single ...