Airworthiness Certification Of Aircraft Icing And Methods For Icing Wind Tunnel Tests

The ice accretions have a dangerous effect on safey flying. So, before entering the market, an aircraft must comply with the ice protection requirement of airworthiness regulation and obtain it's type certificate.Ice tunnel tests is an very important compliance means during the procedure of certification. So, In this article, first some studies have been made on aircraft icing certification. On this basis,scaling software used for icing wind tunnel tests has been developed.Consider of the relationship of the airworthiness certification of aircraft icing and methods for icing wind tunnel tests, several key points are included in this article as follows:1)by reading lots of regulatory and advisory circulars which are related to the airworthiness certification of aircraft icing,the article summarizes the procedure of certification. First, At the beginning of the type certification process, the applicants must coordinate the icing certification plan with aircraft certification office(ACO). The plan should describe all planned tests and evaluations which will be intended to used in the certification of your IPS. Further, the certification plan should identify specific items to be certificated, relevant certification requirements, and proposed methods of compliance.2)by comparing the development of icing wind tunnel between china and abroad, some studies on the operation mechanism of ice wind tunnel have been made, and the problems which are about the building of icing tunnel and should be resolved at present have been proposed.3)Because of test-section blockage limitations, many components can not be tested by full size in an icing wind tunnel. Furthermore, facilities that simulate natural icing condition can only provide limited ranges of air speed, cloud drop size, and liquid-water content. When the reference (full-size) model is too large for a given facility, model-size scaling is applied, and when the desired test conditions are outside the facility operating capability, test-condition scaling is required. This article has developed the corresponding scaling method program. At last, contrasts between the scale and reference ice accretions have been involved using ice accretion code, and the scaling methods for size-scaling and test-condition scaling are advocated.With the research of aircraft icing airworthiness certification, work contents and concerned technology involved in the process of aircraft icing airworthiness certification have been researched deeply, a complete set of guide for aircraft icing airworthiness certification has been formed, the guide can provide reference to the compiling ice airworthiness certification rules and regulations in the future. The research of methods for icing wind tunnel tests made the application of icing wind tunnel test methods in ice airworthiness certification widely, and could become the Technical support of ice airworthiness certification guide.