This notice covers a sole-source procurement of 8 units of a commercial/nondevelopmental/off-the-shelf item, with delivery FOB origin. The item is flight critical and requires Government source approval before award; only previously approved sources have been solicited, and new sources must submit the required Source Approval Brochure information with any offer. The Government intends to negotiate with only one source under FAR 6.302-1, but all responsible parties may express interest and submit capability statements for consideration. Qualification requirements apply at the time of award, and trade agreement clauses may be included in the solicitation. Interested parties can access applicable specifications and standards through the DODSSP/ASSIST system.