This is a sole source procurement notice for a specific flight control mixer assembly, intended for award to Sikorsky under an existing Basic Ordering Agreement. The government requires five units and states that only one responsible source can satisfy the requirement due to proprietary data rights. While not a request for competitive proposals, the agency will consider any capability statements or quotations received within 45 days of the synopsis for potential future competitive actions. Performance will be under the provisions of FAR Part 15, and electronic procedures will be used for the solicitation.