This is a sole-source procurement for one unit of a flight-critical NSN, with delivery FOB origin. The government lacks sufficient technical data to allow competition from unapproved sources, so only previously approved sources are solicited. New sources must submit the required Source Approval Brochure data with their offer, or a cover letter if their approval request is already pending; failure to do so will result in rejection. However, approval processing may not be completed in time to delay award, and the government may proceed to award based on fleet support needs. No budget amount or specific performance location is specified.