题目内容
ATC monitors IFR flights by relying either on _____ or aircraft position reports.
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Aircraft position reports are traditionally sent as _______ transmission.
A flight operating under IFR is required to fall back to ______ if advised radar contact lost.
When flying over the thunderstorms, the aircraft may ______ CAT above the cloud.
______ is the farthest the aircraft can fly without a new clearance.
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