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At the back side of the drag curve the rate of change of drag is negative.

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At the back side of the drag curve the rate of change of drag is negative.

(a) True

(b) False

I have been asked this question in semester exam.

Question is from Descent Performance in Aircraft Operations in chapter Climb and Descent Performance of Aircraft Performance

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The correct option is (a) True

Explanation: At the back side of the drag curve the rate of change of drag is negative. During this case the flight path gradient cannot be alone handled by the elevator control. If the aircraft is flying with airspeed greater than minimum drag speed then the flight path gradient of descent can be increased by increasing airspeed.

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