This is a sole-source procurement for NSN 7R-5985-014876123-QF, quantity 7 units, with delivery FOB origin. The item is flight critical and requires Government source approval prior to award; only previously approved sources have been solicited, and offers from unapproved sources will not be considered unless all required source approval data is submitted. Alternate sources must qualify through the design control activity, and the time required for approval normally prevents delaying award for a new source. The Government intends to negotiate with only one source under FAR 6.302-1, but all responsible sources may express interest and submit capability statements. The acquisition may be subject to trade agreements.