This is a procurement for spare radar transponders (PN: 4079100-0522) for the KC-46 aircraft, with a required delivery of 3 units by August 1, 2026, and 2 units by September 1, 2026. The work involves a mandatory engineering source approval, and the only currently qualified source is The Raytheon Company (Cage: 06845). While the notice states it is not a formal request for competition, proposals from all responsible sources will be considered if received within 45 days of the synopsis publication. The performance location is specified as SW3211. The Government's obligation is contingent upon the availability of appropriated funds.