This is a sole-source acquisition for a flight-critical item, with quantity of 52 units and delivery FOB origin. The technical data is unavailable, so only government-approved sources are being solicited; new sources must submit a source approval package to be considered. The government intends to negotiate with only one source under FAR 6.302-1, but all responsible sources may express interest and capability. Offers that fail to provide required source approval data will not be considered for award. This notice is not a request for competitive proposals, though capability statements will be reviewed to determine whether competition is possible.