Phugoid Oscillation: A Pilot's Nightmare

A phugoid is an aircraft motion characterized by a repetitive cycle of climbing and descending, accompanied by changes in airspeed. Caused by variations in pitch and a nearly constant angle of attack, it can be triggered by factors like elevator input or control surface malfunctions. While sometimes a manageable nuisance, uncontrolled phugoids have been implicated in numerous aviation accidents, including the devastating Japan Airlines Flight 123 crash. Understanding phugoid dynamics is crucial for flight safety.