; (2) the effectiveness and adequacy of the pilot program established under section 161 of the FAA Reauthorization Act of 2018 ( 49 U.S.C. 47104 note); and (3) any other issues related to the demand for and potential use of remote tower technology that the Administrator determines are appropriate. (c) Conforming amendments Section 47124(b) of title 49, United States Code, is amended— (1) in paragraph (3)(B)(ii) by inserting or a remote air traffic control tower equipment that has received System Design Approval from the Federal Aviation Administration after an operating air traffic control tower ; and (2) in paragraph (4)(A)— (A) in clause (i)(III) by inserting or remote air traffic control tower equipment that has received System Design Approval from the Federal Aviation Administration after certified by the Federal Aviation Administration ; and (B) in clause (ii)(III) by inserting or remote air traffic control tower equipment that has received System Design Approval from the Federal Aviation Administration after certified by the Federal Aviation Administration . (d) Extension Section 161(a)(10) of the FAA Reauthorization Act of 2018 ( 49 U.S.C. 47104 note) is amended by striking May 10, 2024 and inserting September 30, 2028 . 622. Audit of legacy systems (a) In general Not later than 120 days after the date of enactment of this Act, the Administrator shall initiate an audit of all legacy systems of the national airspace system to determine the level of operational risk, functionality, and security of such systems and the compatibility of such systems with current and future technology. (b) Scope of audit The audit required under subsection (a)— (1) shall be conducted by an independent third-party contractor or a federally funded research and development center selected by the Administrator; (2) shall include an assessment of whether a legacy system is an outdated, insufficient, unsafe, or unstable legacy system