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The airplane may have to cruise for a long time in the icing condition during the ETOPS (Extended range with Twin engine aircraft OperationS) diversion. This icing condition is quite different to the standard CMIC (Continuous Maximum Icing Condition) and IMIC (Intermittent Maximum Icing Condition) from the cloud horizontal extent range. There are no related guidelines on how to determine the ETOPS icing condition in the current Advisory Circular. This paper provides a method to determine the ETOPS icing condition through the measure data of icing environment in winter storm over the western north Atlantic Ocean combined with the probability of the failure conditions which lead to the ETOPS diversion. Meanwhile, according to the ETOPS icing conditions determined with this method, a typical case is provided to compare the ETOPS ice shape and the holding ice shape.
Inspec keywords: clouds; oceanographic regions; ice; aerospace engines; storms; aircraft
Subjects: Cloud physics; Instrumentation and techniques for geophysical, hydrospheric and lower atmosphere research; Aerospace industry; Atlantic Ocean