***Link*** :: [§ 91.411 Altimeter system and altitude reporting equipment tests and inspections.](https://www.ecfr.gov/current/title-14/section-91.411) ***Description*** :: `= this.link` ***Related To***: [[AAV1ATE]] ***Author*** :: [[FAA]] #### Key Quotes * No person may operate an airplane, or helicopter, in controlled airspace under IFR unless— * Within the preceding 24 calendar months, each static pressure system, each altimeter instrument, and each automatic pressure altitude reporting system has been tested... #source #far