After December 30, 2030, unless otherwise authorized by the Administrator, no person may operate an aircraft under this part in the airspace of the 48 contiguous United States and the District of Columbia with a radio altimeter unless the radio altimeter system meets the performance requirements of § 91.220(b) of this chapter.
[Amdt. No. 121-396, 91 FR 48697, July 31, 2026]