The Department of Defense, through the Naval Air Systems Command (NAVAIR), is seeking to negotiate a modification to an existing delivery order for the redesign of the V-22 Proprotor Gearbox (PRGB) Input Quill/Clutch, specifically to include additional Non-Recurring Engineering (NRE) requirements. This procurement aims to enhance the engineering change proposal efforts for the MV-22, CV-22, and CMV-22 Osprey aircraft, focusing on qualification testing and addressing corrosion and stress-related requirements. The contract will be awarded on a sole source basis to the Bell Boeing Joint Project Office, the only entity with the necessary expertise and technical data to fulfill these requirements. Interested parties may submit their capability statements to the primary contact, Sarah J. Springer, at sarah.j.springer7.civ@us.navy.mil, within fifteen days of the notice publication, although this is not a request for competitive proposals.