Dissecting The PIO

We see it happen here all too often. The Franklin County Airport in Sewanee, Tenn., sits at the western edge of the Cumberland Plateau. During cooler months, northwest winds are thrust up the side of the plateau and swirl back down toward the airport. Tall trees surround the runway and make the airport difficult to see throughout the approach. Pilots in the pattern are greeted by updrafts followed by downdrafts that can make landing on our 50-by-3700-foot runway a challenge.

Key Takeaways:

• Pilot-Induced Oscillation (PIO) is a dangerous phenomenon that occurs during challenging landings when a pilot's control inputs become out of sync with the airplane's natural longitudinal oscillations, often exacerbated by excessive approach speed.
• The article explains aircraft longitudinal oscillations (phugoid and short-period) through a pendulum analogy, demonstrating how interventions can either dampen or worsen these motions.
• To recover from PIO, pilots should neutralize elevator control and maintain an approach attitude, allowing the aircraft's inherent stability to dampen the oscillations; the best prevention involves verifying aircraft stability and using correct approach airspeeds in gusty conditions.

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