Helicopter Sikorsky S-69 XH-59 Serial 69-001 Register 73-21941 used by Sikorsky Helicopters. Built 1973. Aircraft history and location Aircraft History 73-21941 Sikorsky Helicopters 1973-08-24US Army/NASA XH-59A ABC f/f 26jul73 tested in NASA Ames 40x80 ft tunnel 24aug73 badly damaged in a crash Send Updates Use APP to upload photo @ (optional) When Now? / / Send