Research on Handling Risk Assessment for Civil Airplane under Dual Engine Failure

Dual engine failure is the most serious risk that a civil airplane may encounter in airline operations and flight tests. CCAR-25.671(d) clearly stipulates that the airplane must be designed so that it is controllable if all engines fail. In this paper, by building the aircraft 6-DOF motion simulation model and the control surface malfunction simulation model, the theoretical calculation and analysis of the airplane control characteristics after dual engine failure are given. Moreover, the safety of civil airplane under dual engine failure condition is evaluated. Finally, reasonable suggestions are given based on engineering experience, which can provide a reference for dual engine failure flight test of civil aircraft.