This is a sole-source procurement for a flight-critical item requiring Government source approval prior to award. Only previously approved sources are being solicited, and the part involves unique design and manufacturing knowledge not economically available to the Government. Any alternate source must qualify according to approved procedures and must submit the specified Source Approval Information Brochure data with their offer; offers lacking that data will not be considered. The Government intends to negotiate with only one source under FAR 6.302-1, but all responsible sources may express interest or submit capability statements for consideration. A determination on whether to conduct a competitive procurement will be based on responses received.