; (2) not later than December 31, 2025, publish a performance-based vertiport design advisory circular; and (3) begin the work necessary to update the advisory circular of the FAA titled Heliport Design (Advisory Circular 150/5390) in order to provide performance-based guidance for heliport design, including consideration of alternative fuel and propulsion mechanisms. (b) Engineering brief sunset Upon the publication of an advisory circular pursuant to subsection (a)(2), the Administrator shall cancel the memorandum described in subsection (a)(1). (c) Dual use facilities The Administrator shall establish a mechanism by which owners and operators of aviation infrastructure can safely accommodate, or file a notice to accommodate, powered-lift aircraft if such infrastructure meets the safety requirements or guidance of the FAA for such aircraft. (d) Guidance, forms, and planning The Administrator shall— (1) not later than 18 months after the date of enactment of this Act, ensure airport district offices of the FAA have sufficient guidance and policy direction regarding the use and applicability of heliport and vertiport design standards of the FAA, and update such guidance routinely; (2) determine if updates to FAA Form 7460 and Form 7480 are necessary and update such forms, as appropriate