After a type civil engine entering into service, the civil aircraft equipped with this type engine occurs oil low pressure alert caused by the failure of oil pressure transducer during operation, and this alert leads pilot to shutoff engine actively and leads to engine shutdown. A safety analysis method is used to evaluate the feasibility of adding an oil low pressure switch in engine oil system, at the same time, the impact of adding switch is traded study. As a result, the method of adding the oil low pressure switch is available and it is advantage to ensure the safety and dispatch for this aircraft service.