; and (3) the noise standards described in part 36 of such title 14 shall not apply to such an operation. (b) Surplus military aircraft In promulgating any rule under subsection (a), the Administrator shall not enable any aircraft of a type that has been manufactured in accordance with the requirements of, and accepted for use by, any branch of the United States Military and has been later modified to be used for wildfire suppression operations. (c) Conforming amendments to FAA documents In promulgating an interim final rule under subsection (a), the Administrator shall amend FAA Order 8110.56, Restricted Category Type Certification (dated February 27, 2006), as well as any corresponding policy or guidance material, to reflect the requirements of subsection (a). (d) Savings provision Nothing in this section shall be construed to limit the Administrator’s authority to take action otherwise authorized by law to protect aviation safety or passenger safety. (e) Definitions For purposes of this section: (1) Covered aircraft The term covered aircraft means an aircraft type-certificated in the restricted category under section 21.25 of title 14, Code of Federal Regulations, used for transporting firefighters to and from the site of a wildfire in order to perform ground wildfire suppression for the purpose of extinguishing a wildfire on behalf of, or pursuant to a contract with, a Federal, State, or local government agency. (2) Firefighters The term firefighters means a trained fire suppression professional the transport of whom is necessary to accomplish a wildfire suppression operation. 340. Study on impacts of temperature in aircraft cabins (a) Study (1) In general Not later than 2 years after the date of enactment of this section, the Administrator shall enter into appropriate arrangements with the National Academies of Sciences, Engineering, and Medicine (in this subsection referred to as the National Academies ) under which the National Academies will conduct a 1-year study on the health and safety impacts, with