The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of 8 units of a servomechanism (NSN 7R-1650-014725564-KB) critical to aircraft hydraulic systems. This presolicitation notice indicates that the item requires government source approval prior to contract award, as it is flight critical and the technical data available does not support full and open competition. Interested vendors must provide comprehensive documentation as outlined in the NAVSUP WSS Source Approval Information Brochures, and offers lacking the necessary data will not be considered. For further inquiries, interested parties can contact Shannon K. Fitzgerald at (215) 697-3638 or via email at SHANNON.K.FITZGERALD@NAVY.MIL.