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External ARTCC subset. (Block of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.) [3] 1400 Canada: VFR flight above 12,500' ASL when no other code has been assigned. [7] Japan: VFR flight above 10,000' MSL when no other code has been assigned. [citation needed] US: External ARTCC subset.
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 ...
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.
Commonly referred to as a squawk code. [21] Mode 4: military only; provides a 3-pulse reply, delay is based on the encrypted challenge. [21] Mode 5: military only; provides a cryptographically secured version of Mode S and ADS-B GPS position. [21] Modes 4 and 5 are designated for use by NATO forces.
N No surveillance equipment for the route to be flown is carried, or the equipment is unserviceable; A Transponder – Mode A (4 digits – 4,096 codes) C Transponder – Mode A (4 digits – 4,096 codes) and Mode C; E Transponder — Mode S, including aircraft identification, pressure-altitude and extended squitter capability
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