This is a spares procurement for an oxygen concentrator assembly (NSN 1660-99-133-7851FW, P/N 3478W000-001) for the B-2, with a total line-item quantity of 12 each (range 3–18). The Government intends to solicit and negotiate with only one or a limited number of sources, and Honeywell Aerospace Yeovil (CAGE U1605) is the qualified source; because the Government does not own the data or rights needed to manufacture the item, interested firms should contact the OEM. The solicitation is estimated to issue on 19 Oct 2026, and award is anticipated 90 days after issuance of the notice. Delivery is required on or before 4 Feb 2028 to destination SW3211. The acquisition will not be set aside, surplus is not authorized, UID requirements apply, no qualification requirements or export-control restrictions apply, and electronic procedures will be used with the solicitation available only for download at SAM.gov.