This is a solicitation for 16 units of a commercial, off-the-shelf, flight-critical part that requires Government source approval prior to contract award. Only previously approved sources have been solicited, and the approval process for a new source is typically too lengthy to delay an award. Unapproved offerors must submit a complete source approval request with their proposal, or provide documentation of a previously submitted request, or their offer will not be considered. The item is to be delivered FOB Origin. Performance of services location is not specified.