YF-102 Turbofan Engine Blade Note: This item is currently in storage. This blade came from the first YF-102/ALF 502 turbofan engine that Lycoming designed and manufactured. The YF-102 engine was used on the Northrop A-9, which lost the close air support aircraft competition to the Fairchild Republic A-10. Donated by Mr. Gordon T. Vail. Click here to return to the Featured Accessions index. Find Out More Related Fact Sheets Fairchild Republic A-10A Thunderbolt II Note: The appearance of hyperlinks does not constitute endorsement by the National Museum of the USAF, the U.S. Air Force, or the Department of Defense, of the external website, or the information, products or services contained therein.