; (2) identify additional research needed to more effectively develop and use such metrics and make such determinations; and (3) in developing parameters for probabilistic metrics, this study shall take into account the utility of performance standards to make determinations under section 45505(a) of title 49, United States Code, (as added by this Act). (b) Consideration of results The Administrator shall consider the results of the study conducted under subsection (a) when making a determination described in subsection (a)(1). (c) Report Not later than 9 months after the date of enactment of this Act, the Administrator shall transmit the results of the study conducted under subsection (a) to the Committee on Science, Space, and Technology of the House of Representatives and the Committee on Commerce, Science, and Transportation of the Senate. 723. Probabilistic assessment of risks The Administrator shall conduct research and development to enable a probabilistic assessment of risks to inform requirements for standards for operational certification of public unmanned aircraft systems in the national airspace. 724. Unmanned aerial vehicle-manned aircraft collision research (a) Research The Administrator shall coordinate with NASA to conduct comprehensive testing of unmanned aerial vehicles colliding with a manned aircraft, including— (1) collisions between unmanned aerial vehicles of various sizes, traveling at various speeds, and commercial jet airliners of various sizes, traveling at various speeds; (2) collisions between unmanned aerial vehicles of various sizes, traveling at various speeds, and propeller planes of various sizes, traveling at various speeds; (3) collisions between unmanned aerial vehicles of various sizes, traveling at various speeds, and blimps of various sizes, traveling at various speeds; (4) collisions between unmanned aerial vehicles of various sizes, traveling at various speeds, and rotorcraft of various sizes, traveling at various speeds