As the designer, developer, and OEM for the H-764G, Honeywell is the only company that has the ability, resources, technology, and documentation necessary to modify, develop, produce, maintain, and support these systems. The authority permitting other that full and open competition is Title 10, U.S. Code 2304(c)(1), as implemented by Federal Acquisition Regulation 6.302-1, only one responsible source and no other supplies or services will satisfy agency requirements. The estimated period of performance is contract award thru government FY-11. Numbered Note 22 applies.