This is a solicitation for 18 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, as the approval process for a new source is typically too lengthy to delay an award. Unapproved sources must submit a detailed source approval request package along with their proposal to be considered. The delivery terms are FOB Origin, but no specific performance location is stated. No budget or monetary amounts are specified in the description.