; and (2) in each of clauses (i)(III) and (ii)(III) of paragraph (4)(A), by inserting or remote air traffic control tower equipment that has received System Design Approval (SDA) from the Federal Aviation Administration after certified by the Federal Aviation Administration . 620. Grant assurances Section 47107(a) of title 49, United States Code, is amended— (1) in paragraph (7), by striking the semicolon and inserting , such that there are no unsafe practices or conditions as determined by the Secretary; ; (2) in paragraph (20), by striking and after the semicolon; (3) in paragraph (21), by striking the period at the end and inserting ; and ; and (4) by inserting after paragraph (21), the following: (22) the airport owner or operator may not restrict or prohibit the sale or self-fueling of any 100-octane low lead aviation gasoline for purchase or use by operators of general aviation aircraft if such aviation gasoline was available at that airport at any time during calendar year 2022, until the earlier of— (A) December 31, 2030; or (B) the date on which the airport or any retail fuel seller at such airport can make available an unleaded aviation gas that— (i) has been authorized for use by the Administrator of the Federal Aviation Administration as a replacement for 100-octane low lead aviation gas for use in nearly all spark ignition aircraft and engine models