DUTY PERIODS AND FLIGHT TIME LIMITATIONS APPLICABLE TO FLIGHT CREWMEMBERS.

SEC. 345. DUTY PERIODS AND FLIGHT TIME LIMITATIONS APPLICABLE TO FLIGHT CREWMEMBERS.(a) Rulemaking on Applicability of Part 121 Duty Periods and Flight Time Limitations to Part 91 Operations.—Not later than 180 days after the date of enactment of this Act, the Administrator of the Federal Aviation Administration shall initiate a rulemaking proceeding, if such a proceeding has not already been initiated, to require a flight crewmember who is employed by an air carrier conducting operations under part 121 of title 14, Code of Federal Regulations, and who accepts an additional assignment for flying under part 91 of such title from the air carrier or from any other air carrier conducting operations under part 121 or 135 of such title, to apply the period of the additional assignment 126 STAT. 82 (regardless of whether the assignment is performed by the flight crewmember before or after an assignment to fly under part 121 of such title) toward any limitation applicable to the flight crewmember relating to duty periods or flight times under part 121 of such title.(b) Rulemaking on Applicability of Part 135 Duty Periods and Flight Time Limitations to Part 91 Operations.—Not later than 1 year after the date of enactment of this Act, the Administrator shall initiate a rulemaking proceeding to require a flight crewmember who is employed by an air carrier conducting operations under part 135 of title 14, Code of Federal Regulations, and who accepts an additional assignment for flying under part 91 of such title from the air carrier or any other air carrier conducting operations under part 121 or 135 of such title, to apply the period of the additional assignment (regardless of whether the assignment is performed by the flight crewmember before or after an assignment to fly under part 135 of such title) toward any limitation applicable to the flight crewmember relating to duty periods or flight times under part 135 of such title.(c) Separate Rulemaking Proceedings Required.—The rulemaking proceeding required under subsection (b) shall be separate from the rulemaking proceeding required under subsection (a).