Engine reverser thrust system safety design

The overall safety requirements of reverser thrust system were attained by studying airworthiness regulation 25.933, relative airworthiness advisory circulars and background information of reverser thrust system, combining reverser thrust system accident of civil aircraft. These offer useful instructions for improving the safety of reverser thrust systems. A aircraft's reverser thrust system preliminary scheme was assessed by using of system safety assessment method. Results indicate that system architecture don't meet safety requirements,there is a single failure in the system architecture which can lead to thrust reverser device accidentally opened. To eliminate the single failure, the scheme of sync lock control would be isolated from the engine accessory unit (EAU) was proposed,which not only evidently improve the safety of the reverser thrust system of a type aircraft, but also provide important instructions for designing the reverser thrust system on other type aircrafts.