This is a sole-source procurement for a flight-critical part requiring Government source approval prior to award. Only previously approved sources are solicited, and new sources must qualify through the design control activity, a process that normally cannot be completed in time for award. Interested unapproved sources must submit the required technical data per the NAVSUP WSS Source Approval Brochure; offers failing to do so will not be considered. The Government intends to negotiate with only one source under FAR 6.302-1, but all responsible sources may express interest or submit capability statements. No budget amount or performance location is specified.