The requirement is for NSN 7R-6625-016874212-SX, quantity 1 EA, delivery FOB origin. The Government lacks sufficient, accurate, or legible data to purchase the part/repair from any source other than the current source(s). The item is flight critical and/or the available technical data is inadequate for full and open competition, so Government source approval is required before award and only previously approved sources were solicited. Non-approved sources must submit the information required by the applicable NAVSUP WSS Source Approval Brochure with their proposal, and offers lacking required data will not be considered. If source approval cannot be processed in time, award may proceed based on Fleet support needs; FAR Part 12 commercial-item policies are not being used, though interested parties may identify commercial-item interest and capability to the contracting officer.