The Government proposes a 5-year indefinite delivery requirements contract for a minimum of 21 multi-system test sets, with production lead times of 540 days with First Article Testing or 360 days without. Deliveries are to Tracy, CA. The item is currently restricted to two pre-approved manufacturers, Ultrax Aerospace, Inc. and ECI Defense Group, Inc., as the technical data for competitive acquisition is unavailable. All offerors must meet prequalification requirements, and firms capable of producing the item are encouraged to identify themselves and seek source approval for future opportunities. Responsible sources may submit an offer for consideration.