Indicated Airspeed Knot Transponder 
Flight Training Central
NOVEMBER 4, 2024
A transponder with altitude reporting and an approved ADS-B out transmitter are also required for all operations. With few exceptions, the transponder and ADS-B units must also be operable within 30 nautical miles of the primary airport within the Class B airspace, even when not entering the Class B airspace.
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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