An air-starting flight test scheme of the turbo-shaft engine was designed to evaluate the urgent air-starting characteristics of turbo-shaft engine and the corresponding disposal measures in the situation of the engine accidental shutdown possibly encountered during combat flight. The air-starting flight test scheme was applied to the design appraisal flight test of a turbo-shaft engine in several different flight conditions. Results showed that the designed flight test scheme was reasonable and feasible

providing an effective way to evaluate the air-starting ability of turbo-shaft engine from the perspective of practical combating use. Above 4000m altitude

the helicopter average declining altitude was 670m and average engine-shutdown time was 185s in the engine restart processes. The flight test scheme and results are useful and provide references for the military pilots to deal with possible engine accidental shutdown.