gyegi bihaenggyuchik
instrument flight rules
règles de vol aux instruments ; règles IFR ; règles de navigation instrumentale
비행기는 계기 비행규칙에 따라 운항해야 합니다.
bihaenggineun gyegi bihaenggyuchike ttala unhanghaeya hamnida.
The aircraft must operate according to instrument flight rules.
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