Presolicitation notice from the Department of Defense, Department of the Navy, and NAVSUP Weapon Systems Support is seeking a heat exchanger for aircraft air conditioning, heating, and pressurizing equipment. The heat exchanger, NSN 7R-1660-016004909-V2, with reference number 67200020-1, is required in a quantity of 25 each. Delivery is FOB origin. Government source approval is necessary due to the item's flight critical nature and inadequate technical data for open competition. Only previously approved sources have been solicited. Potential new sources must submit the required information for source approval. Failure to provide all necessary data will result in disqualification. The solicitation allows for award based on fleet support needs if source approval cannot be processed in time. More information can be found in the NAVSUP WSS Source Approval Information Brochures and the NAVSUP WSS Commercial Item Identification Brochure.