This requirement is for one each of NSN 7R-1560-017355842-E7, reference 123GSR6-303, delivered FOB origin. The part is flight critical and requires engineering source approval by the design control activity; only previously approved sources have been solicited, and alternate sources must qualify under the cognizant Government engineering activity’s procedures. Unapproved sources must submit the required source approval information with their proposal, and offers lacking all required data will not be considered. The Government intends to solicit and negotiate with only one source under FAR 6.302-1, while responsible sources may identify interest and capability to support a possible competitive procurement. FAR Part 12 commercial-item policies are not being used, and drawings are not available.