Abstract:This paper mainly focuses on minimum control airspeed ,and one experimental evaluation of minimum control airspeed(Vmca) of PA-34 aircraft is introduced. Flight test technique, test method and conditions, test data and results are presented. Based on FAA 14 CFR 23,experimental results for the minimum control airspeed are discussed and analyzed . The Vmca of PA-34 can meet the demand of requirements of airworthiness rules of FAA,and banking into good engine can reduce the Vmca.