题目内容

A flight clearance is based on all the following but ______.

A. route
B. altitude
C. time
D. destination

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In controlled airspace, _____ separates aircrafts from obstacles.

ATC
B. pilots
C. dispatchers
D. mechanics

ATC monitors IFR flights by relying either on _____ or aircraft position reports.

A. radar
B. instruments
C. sensations
D. visual references

Aircraft position reports are traditionally sent as _______ transmission.

A. video
B. radio
C. pictures
D. text

A flight operating under IFR is required to fall back to ______ if advised radar contact lost.

A. position reports
B. instruments
C. sensations
D. visual references