This is a procurement for 5 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 specific NAVSUP WSS brochures. The delivery terms are FOB Origin. Offers lacking the complete required source approval data will not be considered for award.