This requirement is for 47 units of an NSN part requiring engineering source approval by the design control activity, with delivery FOB origin. Only government-approved sources have been solicited, as the part is flight critical and technical data is insufficient for full and open competition. Any alternate source must submit the information detailed in the NAVSUP WSS Source Approval Brochure with its proposal. Offers that fail to provide all required source approval data will not be considered for award. Award may proceed based on fleet needs if a new source's approval cannot be processed in time.