This sources sought is for market research to assess the feasibility of a competitive acquisition and identify sources for overhaul/repair/upgrade of the Control Unit, Supervisory, Turbine Engine. The estimated quantity range is 150 to 1,860 each, including 310 Foreign Military Sales units, under NAICS 336412 with a 1,500-employee size standard. The only currently known approved source is Triumph Engine Control Systems, LLC (large business); no Depot Maintenance Work Requirement is available for a full and open competitive solicitation, and contractors are encouraged to pursue Source Approval Requests. Interested parties should identify business size and socioeconomic status and provide company and point-of-contact details via email to the listed contract specialist. This announcement is for information and planning purposes only, does not constitute an RFP, and a synopsis will be issued at a later date.