From the notice

NSN 7R-4920-015514349-QE, TDP VER 002, QTY 14 EA, DELIVERY FOB ORIGIN. NSN 7RH 4920 015514349 QE, PN D0011571-1001, QTY 14 EA, DELIVERY FOB ORIGIN. This part requires engineering source approval by the design control activity in order to maintain the quality of the part. Existing unique design capability, engineering skills, and manufacturing/repair knowledge by the qualified source(s) require acquisition/repair of the part from the approved source(s). The approved source(s) retain data rights,manufacturing/repair knowledge, or technical data that are not economically available to the Government, and the data or knowledge is essential to maintaining the quality of the part. An alternate source must qualify in accordance with the design control activity's procedures, as approved by the cognizant Government engineering activity. The qualification procedures must be approved by the Government engineering activity having jurisdiction over the part in the intended application. The subject item requires Government source approval prior to contract award, as the item is flight critical and/or the technical data available has not been determined adequate to support acquisition via full and open competition. Only the source(s) previously approved by the Government for this item have been solicited. The time required for approval of a new source is normally such that an award cannot be delayed pending approval of a new source.

Read the whole notice and its files on SAM.gov ↗