; and (2) an air carrier to submit to the Administrator of the Federal Aviation Administration a proposal to permit flight crew members to wear masks or protective face coverings in the flight deck, including a safety risk assessment with respect to that proposal. (c) Market unavailability of necessary items (1) Notice of market unavailability (A) In general If an owner or operator described in paragraph (1) of subsection (b) is unable to acquire 1 or more items necessary to comply with the requirements prescribed under that paragraph due to market unavailability of the items, the owner or operator shall— (i) not later than 7 days after the date on which the owner or operator is unable to acquire each applicable item, submit to the Secretary a written notice explaining the efforts made and obstacles faced by the owner or operator to acquire that item