题目内容
The most important concept of IFR flying is that separation is maintained ____of weather conditions.
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ATC monitors IFR flights on radar, or through aircraft position reports in areas where radar____is not available.
In the United States, a flight operating under IFR is required to provide position reports if ATC advises a pilot that the plane is not ____on radar.
A clearance always____a clearance limit, which is the farthest the aircraft can fly without a new clearance.
Aircraft separates themselves from each other by using charted minimum altitudes to avoid ____and obstacles.
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