***Link*** :: [§ 91.413 ATC transponder tests and inspections.](https://www.ecfr.gov/current/title-14/section-91.413) ***Description*** :: `= this.link` ***Related To***: [[AAV1ATE]] ***Author*** :: [[FAA]] #### Key Quotes * No persons may use an ATC transponder.... unless, within the preceding 24 calendar months, the ATC transponder has been tested #source #far