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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.
Non-discrete mode A code reserved use in mode S radar/ADS-B environment where the aircraft identification will be used to correlate the flight plan instead of the mode A code. [1] US: Used exclusively by ADS-B aircraft to inhibit mode 3A transmission. [3] US: Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2.
A Mode A transponder code response can be augmented by a pressure altitude response, which is then referred to as Mode C operation. [2] Pressure altitude is obtained from an altitude encoder, either a separate self-contained unit mounted in the aircraft or an integral part of the transponder.
For mode A, each digit in the transponder code (A, B, C, or D) may be a number from zero to seven. These octal digits are transmitted as groups of three pulses each, the A slots reserved for the first digit, B for the second, and so on. In a mode C reply, the altitude is encoded by a Gillham interface, Gillham code, which uses Gray code. The ...
The name refers to the mode of transponder operation which is required within this airspace — that is, with very limited exceptions, all aircraft operating within this airspace must have an altitude-reporting Mode C transponder in operation. An additional requirement for the transponder to have ADS-B Out became effective January 1, 2020. [2]
The pilot then selects the 0363 code on their transponder and the track on the air traffic controller's radar screen will become correctly associated with their identity. [6] [7] Because primary radar generally gives bearing and range position information, but lacks altitude information, mode C and mode S transponders also report pressure altitude.
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Mode A Transponder pulse-code reporting Mode B Transponder code and altitude reporting Mode C Transponder code, altitude, and TCAS reporting MOE maintenance organisation exposition MOPS Minimum Operational Performance Standard MORA Minimum Off Route Altitude MOSArt Modular Open System Architecture MP manifold pressure: MPL multi-crew pilot ...