***Link*** :: [§ 91.215 ATC transponder and altitude reporting equipment and use.](https://www.ecfr.gov/current/title-14/section-91.215) ***Description*** :: `= this.link` ***Related To***: [[Transponder]] ***Author*** :: [[FAA]] #### Useful Resources [[ADS-B and Mode C Requirements.jpg]] #### Key Quotes * ...no person may operate an aircraft in the airspace described \[below\] unless that aircraft is equipped with an operable coded radar beacon transponder... * In Class A, Class B, and Class C airspace areas; * In all airspace within 30 nautical miles of an airport listed in appendix D... surface upward to 10,000 feet MSL * All aircraft in all airspace above the ceiling and within the lateral boundaries of a Class B or Class C airspace area designated for an airport upward to 10,000 feet MSL; and * ... * In all airspace of the 48 contiguous states and the District of Columbia at and above 10,000 feet MSL, excluding the airspace at and below 2,500 feet above the surface... * in all controlled airspace, each person operating an aircraft equipped with an operable ATC transponder... shall operate the transponder, including Mode C equipment if installed * Requests for ATC authorized deviations must be made to the ATC facility having jurisdiction over the concerned airspace... * aircraft with an inoperative transponder to the airport of ultimate destination, including any intermediate stops, or to proceed to a place where suitable repairs can be made or both, the request may be made at any time * aircraft that is not equipped with a transponder, the request must be made at least one hour before the proposed operation #source #far