Discussion
During an aircraft cruising flight, the altitude above the ground is usually measured using
Answer: B
In cruise, altitude is usually measured using static pressure.
The barometric altimeter reads the static pressure of the surrounding air and converts it to altitude through the standard atmosphere. All aircraft carry one, and flight levels in cruise are pressure altitudes.
Dynamic pressure is what the airspeed indicator measures, not altitude. Radar altimeters measure height above the ground but are used mainly at low height, on approach and landing, not in normal cruise. Laser range finders are not the standard instrument for aircraft altitude.
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