Sikorsky Aircraft was awarded the US Army's Utility Tactical Transport Aircraft System (UTTAS) contract in 1976 to develop a helicopter to replace the Bell UH-1 Iroquois that had entered service in the 1960's. The first production aircraft (UH-60A) was flown in October of 1978 with the US Army enchanting liberation of its first Black Hawk in that same month. A total of 1,048 UH-60As were built for the US Army between 1978 and 1989, when production of the UH-60L was initiate. All existing UH-60As have either been rebuilt to the UH-60L normal or have been removed from service.
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