This is a procurement for 20 units of a 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 sources must submit a detailed source approval request with their proposal, using specified NAVSUP WSS brochures. The delivery terms are FOB Origin. Offers lacking the complete required source approval data will not be considered.