This is a procurement for 28 units of a flight-critical part that requires Government source approval prior to contract award. Only sources previously approved by the Government for this specific item have been solicited. The process for a new source to gain approval is lengthy and cannot delay an award, so unapproved sources must submit detailed qualification information with their proposal. Offers from unapproved sources that fail to provide all required source approval data will not be considered. The delivery terms are FOB Origin.