When must an aircraft equipped with an air traffic control transponder have that transponder checked?

Transponders (FAR 91.413): The transponder must be inspected every 24 calendar months. FAR 43 Appendix F, ATC Transponder Tests and Inspections, lists the items that must be checked. To use a transponder, it must be inspected every 24 calendar months.



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When an aircraft is not equipped with a transponder, what requirement must be met before ATC will authorize a flight within Class B airspace? A request for the proposed flight must be made to ATC at least 1 hour before the flight.

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For VFR operations, the FAA requires all transponder-equipped aircraft to be inspected to verify the proper operation of the transponder.

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For aircraft operating below 18,000 feet and within U.S. airspace, you must be equipped with either a Mode S transponder with Extended Squitter or a Universal Access Transceiver (UAT).

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Code 0000 should never be assigned or used. However, NASA recommends that crews set 0000 after landing to help detect when a clearance has not been received. Resetting the transponder to 0000 (four zeros) after landing can help you, or the next crew, detect lack of a PDC.

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A Primary Radar System. Typically located on the control tower or other strategic location on the airport, the Primary Radar antenna is able to detect and display aircraft that are not equipped with or have malfunctioning transponders or ADS-B.

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