 This rotorcraft crashed in June 1976 but a static test prototype was brought up to flight standard and, along with the second prototype (73-22247), entered the flyoff against the Hughes entry, the Model 77 (YAH-64).The Hughes YAH-64 was selected in December 1976 and was developed into the production AH-64 Apache version.The Army believed that the YAH-63's two-blade rotor was more vulnerable to damage than the Apache's four-bladed rotor.