题目内容

ATC monitors IFR flights on radar, or through procedural control where radar coverage is not ______ .

A. necessary
B. available
C. needed
D. sufficient

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Aircraft position reports are ______ if ATC can see an aircraft on radar.

A. required
B. necessary
C. unnecessary
D. possible

A flight operating under IFR is required to provide _______ if ATC advises a pilot that the plane is not visible on radar.

A. speed reports
B. heading reports
C. altitude reports
D. position reports

In uncontrolled airspace, IFR aircrafts separate themselves from each other by using charted _______ altitudes to avoid terrain and obstacles.

A. maximum
B. minimum
C. necessary
D. best

In the United States and Southern Domestic Airspace of Canada, airspace from 18000 to 60000 feet is _______ as class A, requiring an IFR clearance for all aircrafts.

A. designated
B. designed
C. defined
D. required