; and (B) any airworthiness standards not complied with are compensated for by factors that provide an equivalent level of safety, as agreed upon by the Administrator. . (b) Report to Congress Not later than 1 year after the date of enactment of this Act, the Administrator shall provide to the appropriate committees of Congress a briefing on the implementation of the certification requirement added by the amendment made by subsection (a). 344. Changed product rule reform (a) In general Not later than 18 months after the date of enactment of this Act, the Administrator shall issue a notice of proposed rulemaking to revise section 21.101 of title 14, Code of Federal Regulations, to achieve the following objectives: (1) For any significant design change, as determined by the Administrator, to require that the exception related to impracticality under subsection (b)(3) of such section from the requirement to comply with the latest amendments of the applicable airworthiness standards in effect on the date of application for the change be approved only after providing public notice and opportunity to comment on such exception. (2) To ensure appropriate documentation of any exception or exemption from airworthiness requirements in title 14, Code of Federal Regulations, as in effect on the date of application for the change. (b) Congressional briefing Not later than 1 year after the date of enactment of this Act, the Administrator shall provide to the appropriate committees of Congress a briefing on the implementation by the FAA of the recommendations of the Changed Product Rule International Authorities Working Group, established for purposes of carrying out the requirements of section 117 of the Aircraft Certification, Safety, and Accountability Act ( 49 U.S.C. 44704 note), including recommendations on harmonized changes and reforms regarding the impractical exception. (c) Final rule Not later than 3 years after the date of enactment of this Act, the Administrator shall issue a final rule based on the notice of