AGL Indicated Airspeed Transponder 
Flight Training Central
MARCH 18, 2024
indicated airspeed, the speed limit for operations below 10,000′ MSL. indicated airspeed. Before operating in Class B, you must receive authorization from ATC, maintain two-way radio communications with ATC, have an operating transponder with altitude reporting and be ADS-B Out equipped.
Pilot Institute
SEPTEMBER 26, 2024
Aircraft need to have a two-way radio, transponder with Mode C, and Automatic Dependent Surveillance-Broadcast (ADS-B) Out equipment. Class C airports’ speed limits require aircraft within 4 Nautical Miles (NM) of the primary airport and below 2500 feet to maintain an Indicated Airspeed (IAS) of 200 knots or less.
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