Yaw controls on an Israel Aircraft Industries/Boeing Arrow II anti-tactical ballistic missile interceptor failed on booster separation, causing it to veer off a perfect trajectory within 10s of striking its target during a 26 August test in the USA. Electronics connecting the flight-control computer to pitch-attitude controls continued to work after the missile battery's ground-based radar had distinguished between targets simulating a separating ballistic warhead and its booster rocket, but yaw controls did not respond to commands, according to Arie Herzog, head of the Israeli missile defence organisation.
Source: Flight International