the final crash resulted in grounding of the two surviving model c's on february 16, 1914. an army board of investigation concluded that the elevator was "too weak" and that the model c itself was "dynamically unsuited for flying," despite testimony from wright's chief instructor that poor maintenance played a key role in the fatalities. the aeronautical division hired loening as an engineer to review the airworthiness of its airplanes, and use of s.c.s no. 16 (which had a less powerful model b engine) and no. 5 (a burgess f rebuilt to model c configuration), permanently discontinued on february 24, 1914, when on loening's recommendation the army de-commissioned all seven of its remaining "pusher" airplanes as a matter of policy.