; and (iii) fatigue countermeasures. (C) Development and use of a methodology that continually assesses the effectiveness of implementation of the plan, including the ability of the plan— (i) to improve alertness; and (ii) to mitigate performance errors. (3) Review Not later than 1 year after the date of enactment of this Act, the Administrator shall review and accept or reject each fatigue risk management plan submitted under this subsection. If the Administrator rejects a plan, the Administrator shall provide suggested modifications for resubmission of the plan. (4) Plan updates (A) In general A part 121 air carrier shall update its fatigue risk management plan under paragraph (1) every 2 years and submit the update to the Administrator for review and acceptance. (B) Review Not later than 1 year after the date of submission of a plan update under subparagraph (A), the Administrator shall review and accept or reject the update. If the Administrator rejects an update, the Administrator shall provide suggested modifications for resubmission of the update. (5) Compliance A part 121 air carrier shall comply with the fatigue risk management plan of the air carrier that is accepted by the Administrator under this subsection. (6) Civil penalties A violation of this subsection by a part 121 air carrier shall be treated as a violation of chapter 447 of title 49, United States Code, for purposes of the application of civil penalties under chapter 463 of that title. B Unmanned Aircraft Systems 431. Definitions Except as otherwise provided, the definitions contained in section 45501 of title 49, United States Code (as added by this Act), shall apply to this subtitle. 432. Codification of existing law