This is a procurement for 56 spare altimeters for the F-16 aircraft, with delivery required by May 3, 2027, to a specified destination code. The acquisition is limited to sources qualified on a specific Qualified Products List (QPL), with two pre-identified manufacturers. The government intends to solicit and negotiate with only a limited number of sources under a non-competitive justification, though it will consider proposals received within 45 days of the synopsis publication. The solicitation will be available electronically, and the contract award is contingent on the availability of funds.