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).
Este aparello esnafrouse en xuño de 1976 pero un dos prototipos das probas estáticas foi preparado para voar e, xunto co segundo prototipo (73-22247), entrou na competición contra a proposta de Hughes, o Model 77 (YAH-64).