How fast should the aircraft's descent rate be between two fixes to arrive at a certain altitude on a non-precision approach? This quick video shows how to determine distance travelled in nautical miles per minute. Knowing the distance travelled per minute and the amount of altitude loss required, the rate of descent in feet per minute can be calculated to arrive a certain fix at a predetermined rate of descent.
This is one example of the many questions asked on the FAA Instrument Knowledge Exam (aka IFR Written Test).
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