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The most dangerous pilot-induced oscillations can occur during [[landing]]. Too much up elevator during the [[flare (aviation)|flare]] can result in the plane getting dangerously slow and threatening to [[Stall (flight)|stall]]. A natural reaction to this is to push the nose down harder than one pulled it up, but then the pilot ends up staring at the ground. An even larger amount of up elevator starts the cycle over again.
While Pilot-Induced oscillations often start with fairly low [[amplitudes]], which can adequately be treated with small [[perturbation linear theory]], several PIOs will incrementally increase in amplitude.<ref name=NTRS>{{cite
In February 1989 a [[JAS 39 Gripen]] prototype [[Accidents and incidents involving the JAS 39 Gripen|crashed]] when landing in Linköping, Sweden. Pilot-induced oscillation as a result of an over-sensitive, yet slow-response flight control system was determined to be the cause. Subsequently, the flight control system was redesigned.
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