This is a sole-source procurement for NSN 7R-5998-016470062-V2, quantity 3 units, with delivery FOB origin. The part is flight critical and requires Government source approval, so only previously approved sources have been solicited. The approved source(s) hold essential technical data and manufacturing knowledge not economically available to the Government, and alternate sources must qualify through Government-approved procedures that normally cannot be completed in time for award. Non-approved sources must submit all required Source Approval Information Brochure data with their proposal, or their offer will not be considered. Contract award is expected to proceed based on Fleet support needs even if a new source approval request cannot be processed in time.