and other activities necessary to ensure that next generation radio altimeter technology is developed, tested, certified, and installed on necessary aircraft by 2028, including through public-private partnership grants (which shall include protections for necessary intellectual property with respect to any private sector entity testing, certifying, or producing next generation radio altimeters under the program carried out under this section) with industry to ensure the accelerated production and installation by January 1, 2028. (c) Review and report Not later than 180 days after the enactment of this section, the Administrator shall submit to the appropriate committees of Congress a report on the steps the Administrator has taken as of the date on which such report is submitted and any actions the Administrator plans to take, including as part of the program carried out under this section, to ensure that next generation radio altimeter technology is developed, tested, certified, and installed by 2028. (d) Rule of construction Nothing in this section shall be construed to apply to efforts to retrofit the existing supply of altimeters in place as of the date of enactment of this section. 919. Hydrogen aviation strategy (a) FAA and Department of Energy leadership on using hydrogen to propel commercial aircraft (1) In general The Secretary, acting through the Administrator and jointly with the Secretary of Energy, shall exercise leadership in the creation of Federal and international policies, and shall conduct research relating to the safe and efficient use and sourcing of hydrogen to propel commercial aircraft. (2) Exercise of leadership In carrying out paragraph (1), the Secretary, the Administrator, and the Secretary of Energy shall— (A) establish positions and goals for the use of hydrogen to propel commercial aircraft