Oman - An Omani navigator was killed when a Royal Air Force helicopter crash-landed in the region of Al-Musana’a. Senior military officials confirmed the accident, which happened yesterday evening at the air force base. The NH90 a medium-sized, twin-engine, multi-role military helicopter crash-landed during a routine military exercise. Sergeant Hilal bin Talib bin Mohammed Al Hashmi was killed in the helicopter crash-landing while the two pilots escaped with minor injuries.