; (2) do not produce appreciable sonic boom overpressures that reach the surface under prevailing atmospheric conditions; (3) have ordinary instrument flight rules clearances necessary to operate in controlled airspace; and (4) comply with applicable environmental requirements. 1109. FAA leadership in hydrogen aviation (a) In general The Administrator shall exercise leadership in the development of Federal regulations, standards, best practices, and guidance relating to the safe and efficient certification of the use of hydrogen in civil aviation, including the certification of hydrogen-powered commercial aircraft. (b) Exercise of leadership In carrying out subsection (a), the Administrator shall— (1) develop a viable path for the certification of the safe use of hydrogen in civil aviation, including hydrogen-powered aircraft, that considers existing frameworks, modifying an existing framework, or developing new standards, best practices, or guidance to complement the existing frameworks, as appropriate; (2) review certification regulations, guidance, and other requirements of the FAA to identify ways to safely and efficiently certify hydrogen-powered commercial aircraft; (3) consider the needs of the aerospace industry, aviation suppliers, hydrogen producers, airlines, airport sponsors, fixed base operators, and other stakeholders when developing regulations and standards that enable the safe certification and deployment of the use of hydrogen in civil aviation, including hydrogen-powered commercial aircraft, in the national airspace system