This is a sources sought announcement for market research on the overhaul of a Mechanical Transmission, an aviation Critical Safety Item. The estimated quantity ranges from a minimum of 25 to a maximum of 160 units, including 25 for Foreign Military Sales. Currently, Sikorsky Aircraft Corporation is the only known approved source, but other contractors may seek Source Approval Requests. Responses must be submitted electronically by 5 May 2026. No budget information or performance location is specified.