; and (2) consider the feasibility of widespread use of such safe and lead-free aviation fuel by not later than 2028. (b) Partnership with private industry The Administrator shall coordinate with industry and pilot operators regarding research programs for mass production and distribution of unleaded aviation gasoline for market viability engine safety, and define criteria to explore incentive programs to reduce lead emissions for communities in need. 202. Continuous lower energy, emission, and noise (CLEEN) The Administrator shall consider expanding the CLEEN program under section 47511 of title 49, United States Code, and broadening eligibility for the CLEEN program to new entrants to the aviation system. 203. Strategy on hydrogen aviation research and development (a) In general The Administrator, in consultation with the Administrator of NASA and the heads of other relevant Federal agencies, shall lead the development of a research and development strategy on the safe use of hydrogen as part of a sustainable future for aviation. Such strategy shall consider the following: (1) The feasibility, opportunities, challenges, and pathways toward the potential and safe uses of hydrogen in aviation. (2) The use of hydrogen in addition to research and development efforts, including electrification, operational efficiencies and other alternatives to traditional aviation fuel. (b) Transmittal Not later than one year after the date of the enactment of the Act, the Administrator shall transmit to the appropriate committees of Congress the research and development strategy required under subsection (a). (c) Research and development Based on the results of the research and development strategy under subsection (a), the Administrator, in coordination with the Administrator of NASA, may conduct research and development activities into the following: (1) The qualification of hydrogen aviation fuel. (2) The safe transition to such fuel for aircraft. (3) The advancement of certification efforts for such fuel. (4) Risk mitigation