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US: Aircraft on a VFR Military Training Route or requiring frequent or rapid changes in altitude. [13] US: Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2. US: Also for use in oceanic airspace unless another code is assigned by ATC. [3] US: External ARTCC subsets.
The codes are intended for use by air, ground, sea, and space operations personnel at the tactical level. Code words that are followed by an asterisk (*) may differ in meaning from NATO usage. There is a key provided below to describe what personnel use which codes, as codes may have multiple meanings depending on the service.
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.
Military mode Civilian mode Description 1: 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 ...
Military Training Routes are usually limited to 420 knots, and in no case are aircraft allowed to exceed Mach 1 within United States sovereign airspace, except in designated Military Operation Areas. While on the route military aircraft squawk a Mode C Transponder code of '4000', which informs controllers that they are 'speeding' on a route.
Operation Ivory Coast – On 21 November 1970, a joint United States Air Force/United States Army force commanded by Air Force Brigadier General LeRoy J. Manor and Army Colonel Arthur D. "Bull" Simons landed 56 U.S. Army Special Forces soldiers [161] by helicopter at the Sơn Tây prisoner-of-war camp located only 23 miles (37 km) west of Hanoi ...
Controllers use the term "squawk" when they are assigning a transponder code, e.g., "Squawk 7421". Transponders can respond with one of several different "modes" determined by the interrogation pulse from the radar. Various modes exist from Mode 1 to 5 for military use, to Mode A, B, C and D, and Mode S for civilian use.
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 ...