Longitudinal stability (pitching) is stability about which axis?

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Study for the Pilot's Handbook of Aeronautical Knowledge Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Longitudinal stability (pitching) is stability about which axis?

Explanation:
Pitching involves rotation about the lateral axis, which runs from wingtip to wingtip. Longitudinal stability refers to the aircraft’s tendency to return to its trimmed pitch attitude after a nose-up or nose-down disturbance, and that motion occurs around the lateral axis. The nose-up and nose-down movements are controlled mainly by the elevator and tail surfaces, creating moments about this axis to restore or change pitch. (In contrast, roll happens about the longitudinal axis, and yaw about the vertical axis.) So longitudinal stability, or pitching stability, is stability about the lateral axis.

Pitching involves rotation about the lateral axis, which runs from wingtip to wingtip. Longitudinal stability refers to the aircraft’s tendency to return to its trimmed pitch attitude after a nose-up or nose-down disturbance, and that motion occurs around the lateral axis. The nose-up and nose-down movements are controlled mainly by the elevator and tail surfaces, creating moments about this axis to restore or change pitch. (In contrast, roll happens about the longitudinal axis, and yaw about the vertical axis.) So longitudinal stability, or pitching stability, is stability about the lateral axis.

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