; and (B) the cost of such upgrade or modification in current year dollars; and (2) the estimated remaining service-life (expressed as equivalent flight hours and years) of— (A) the aircraft; and (B) the onboard systems of the aircraft. 145. Limitation on procurement of KC–46A aircraft (a) Limitation The Secretary of the Air Force may not procure more than six KC–46A aircraft under the final lot of the covered contract unless— (1) (A) the Secretary submits to the congressional defense committees written notice of the intent of the Secretary to procure more than six KC–46A aircraft under the final lot of the covered contract; and (B) a period of 180 days has elapsed following the date on which such notice was submitted; or (2) the Secretary submits to the congressional defense committees written certification by the Assistant Secretary of the Air Force for Acquisition, Technology, and Logistics that— (A) there are validated needs of the Air Force requiring the procurement more than six KC–46A aircraft under the final lot of the covered contract; and (B) cost estimates are complete for the long-term sustainment of any additional aircraft planned to be procured. (b) Covered contract defined In this section, the term covered contract means the contract for the procurement of KC–46A aircraft entered into between the Department of the Air Force and the Boeing Company that is in effect as of the date of the enactment of this Act. 146. Limitation on actions relating to remote vision systems of KC–46A aircraft (a) Limitation The Secretary of the Air Force may not take any action described in subsection (b) until the date on which the Secretary certifies to the Committees on Armed Services of the Senate and the House of Representatives that— (1) the Secretary has identified a solution to fix the remote vision systems of KC–46A aircraft