This procurement is for a flight-critical item that requires Government source approval prior to contract award, with only previously approved sources solicited. The part requires engineering source approval because the approved source retains essential technical data or manufacturing knowledge not economically available to the Government. Any alternate source must qualify in accordance with the design control activity's procedures, and approval of a new source typically takes too long to delay award. Offerors who are not approved sources must submit all required source approval information as detailed in the NAVSUP WSS brochures, or their offers will not be considered. Award will only be made if the offeror, product, or manufacturer meets qualification requirements at the time of award.