; and (B) transmitted to the Committee on Science, Space, and Technology of the House of Representatives and the Committee on Commerce, Science, and Transportation of the Senate. (3) National aviation research plan The national aviation research plan required under section 44501(c) shall include a summary of all research advisory committee recommendations and a description of the status of their implementation. . C Unmanned Aircraft Systems 721. Unmanned aircraft systems research and development roadmap No funds are authorized to be appropriated for the Office of the Administrator for a fiscal year unless the Secretary has submitted the unmanned aircraft systems roadmap to Congress on an annual basis as required under section 45502(a) of title 49, United States Code, (as added by this Act). 722. Probabilistic metrics for exemptions (a) Study Not later than 30 days after the date of enactment of this Act, the Administrator shall commission an independent study to— (1) develop parameters to conduct research and development for probabilistic metrics to enable the identification of hazards and the assessment of risks as necessary to make determinations under section 45505(a) of title 49, United States Code, (as added by this Act) that certain unmanned aircraft systems may operate safely in the national airspace system; (2) identify additional research needed to more effectively develop and use such metrics and make such determinations