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Aviation Glossary :: Short-Period Oscillation  Aviation Glossary :: Short-Period Oscillation FAA Written Test Preparation
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At Dauntless, our editorial staff maintains the web's largest unified glossary of aviation terms. This glossary is built from a combination of official, quasi-official, and proprietary sources (including original material that we develop oursselves). Uniquely, we often provide multiple definitions of a given term so that you can find that which best applies to you. In order to maximize your learning efficiency, this glossary (and similar ones for our international users) is incresingly fully integrated into our aviation learning apps, including our FAA written test prep and FAA practical test prep software and apps. If you like this glossary, you'll love them with their polished learning environments and world's best and clearest content (please do give them a try.).

Short-Period Oscillation
Short-Period Oscillation
A natural oscillating frequency of an aircraft where the period between oscillations are short in time. The period or frequency of natural pitch oscillations of a gyro are typically the result of the gyro’s Moment of Inertia and the effectiveness of the Horizontal Stabilizer. Typically, an oscillation period below about 10 seconds long is considered a Short-Period which is best eliminated by aerodynamic design because a pilot’s normal reactions may not be adequate or timed properly to dampen or prevent continued oscillations. If a natural oscillation period is shorter than about 10 seconds, it is more likely that the pilot’s mistimed reactions may contribute to resonance of the aircraft in pitch at this natural oscillatory rate. All aircraft exhibit some natural oscillatory frequencies. Long-Period oscillations, commonly called Phugoid oscillations are slow enough that the average pilot is not as likely to contribute to the resonant oscillation of that aircraft in pitch. Short-period oscillations are likely the result of low MOI airframes and resonance interaction with the rotor inertia. Specific flight test procedures are required to identify any Short-Period oscillation tendencies in an aircraft. Such Short-Period oscillations can be eliminated or lengthened with proper attention to aerodynamic dampers in the configuration such as a horizontal stabilizer of sufficient volume for that gyro. Short-Period oscillations are particularly difficult to eliminate by design in light gyros, and the existence of a Short-Period oscillatory mode in a gyro is likely the cause of PIO. All aircraft may exhibit both a Short-Period and a Phugoid oscillatory tendency.
source: Glossary of Gyroplane Terms

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