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When is Mode C transponder operation mandatory?

Only when flying under Class B airspace

At or above 10,000 feet MSL and 2,500 feet AGL

Mode C transponder operation is mandatory at or above 10,000 feet MSL and when operating in controlled airspace such as Class B airspace, as well as when within 2,500 feet AGL of the surface and beneath the Class B airspace. This requirement is in place to enhance situational awareness and safety, allowing air traffic control (ATC) to monitor aircraft movements accurately, especially in busy airspace. The use of Mode C transponders provides ATC with critical altitude information and helps prevent midair collisions by giving both ATC and other pilots a reliable method to ascertain the vertical position of an aircraft.

While some settings like Class A airspace and Class B airspace also require Mode C transponder operation, the specific altitude thresholds set at 10,000 feet MSL and 2,500 feet AGL highlight the key operational standards for transponder use.

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Within Class A airspace only

For all flights regardless of altitude

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