F-8 Pilot Induced Oscillations (PIO)


In celebration of upgrading the site to WP Premium here’s some gratuitous eye candy 🙂

A little more seriously, PIO is one of those problems that, contrary to what the name might imply, requires one to treat the aircraft and pilot as a single control system.

One response to F-8 Pilot Induced Oscillations (PIO)


    American Airlines Flight 587 November 12, 2001, is another example, as are countless automotive accidents. In PIO, situational awareness is limited to knowing there is a loss of control, not necessarily what to do about it. I don’t think it’s sufficient (if at all possible) to integrate pilot and vehicle to a single control system. Take for example a near recovery from slipping while walking, PIO still happens. IMHO, the best thing to do after a failed attempt to regain control is identify and choose the safest alternative, such as a new flight trajectory, turning into the slide or meeting the ground on all fours vs continued attempts to walk. In the above video, the pilot was stable after the first correction, had he remained on level flight, he could have pulled up gracefully before the end of the runway, additional oscillation was induced only as he attempted to return to the original intended trajectory. However, the pilot may have perceived he was heading to the ground, during the level segment.

    There is interesting commentary on oculoagravic illusion and spatial disorientation on
    on pages 67 and 93 of:

    “Breaking the Mishap Chain: Human Factors Lessons Learned from Aerospace Accidents and Incidents in Research, Flight Test, and Development”
    June 25, 2012 By Peter W. Merlin, Gregg A. Bendrick, and Dwight A. Holland