We are encountering severe icing at this altitude, request higher level.

在这个高度上我们遇到了严重积冰，请求转高的高度层。

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Insulators icing and electrical tests methods, which is not proposed at any standards by now, are important for the external insulation design of HV transmission lines in severe icing districts.

绝缘子覆冰及其电气特性试验方法是严重复冰地区外绝缘设计的重要基础，但至今尚无该试验方法的标准。

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Numerous pilots had reported icing conditions in the area around the time of the accident, including at least three flight crews that characterized the icing as severe, according to the report.

WSJ: NTSB: Pilot action, icing led to NJ plane crash