; (2) do not cause a measurable sonic boom overpressure to reach the surface; (3) have ordinary instrument flight rules clearances necessary to operate in controlled airspace; and (4) comply with applicable environmental requirements. 910. Electric propulsion aircraft operations study (a) In general Not later than 120 days after the date of enactment of this section, the Comptroller General shall initiate a study assessing the safe and scalable operation and integration of electric aircraft into the national airspace system. (b) Contents The study required under subsection (a) shall address— (1) the technical capacity and competencies needed for the FAA to certify aircraft systems specific to electric aircraft; (2) the data development and collection required to develop standards specific to electric aircraft; (3) the regulatory standards and guidance material needed to facilitate the safe operation of electric aircraft, including— (A) fire protection; (B) high voltage electromagnetic environments; (C) engine and human machine interfaces; (D) reliability of high voltage components and insulation; (E) lithium batteries for propulsion use; (F) operating and pilot qualifications; and (G) airspace integration; (4) the airport infrastructure requirements to support electric aircraft operations, including an assessment of— (A) existing capabilities of airport infrastructure as of the date of enactment of this section; (B) aircraft operations specifications; (C) projected operations demand by carriers and other operators; (D) potential modifications to existing airport infrastructure; (E) additional investments in new infrastructure and systems required to meet operations demand; and (F) management of infrastructure relating to hazardous materials used in hybrid and electric propulsion