Where is a mode C transponder not required?

Mode C Transponder Requirements: These aircraft may conduct operations without a transponder or ADS-B Out when operating: Outside any Class B or Class C airspace area; and. Below the altitude of the ceiling of a Class B or Class C airspace area designated for an airport, or 10,000 feet MSL, whichever is lower.



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There are two exceptions to the Mode C transponder requirement in the FAA regulation Part 91. One for gliders, balloons, and those aircraft which do not have an electrical system, and a second exemption for those who do not have a transponder installed, or who's transponder is not functioning.

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Class D airspace: No transponder is required unless otherwise specified by ATC (Pilots only require two-way radio communication in this class of airspace).

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ADS-B, typically, does not outright replace your Mode C transponder but is an addition to it.

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How to get Approval to Enter Class C Airspace. The approval needed to enter Class C airspace is like Class D in that you do not need a specific clearance, but you do need to establish two-way communication with control. To be able to enter Class C airspace, a pilot must contact ATC prior to arrival.

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If you are flying out of a Class C or Class D airport, for a VFR flight following request, you can usually request flight following with the local ground control. Because flight following is voluntary, if the airspace is extremely busy, controllers may tell you they are unable to provide.

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§ 91.117 Aircraft speed. (b) Unless otherwise authorized or required by ATC, no person may operate an aircraft at or below 2,500 feet above the surface within 4 nautical miles of the primary airport of a Class C or Class D airspace area at an indicated airspeed of more than 200 knots (230 mph.).

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Pilots must be able to turn off transponders, and sometimes must turn them off for safety reasons.

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