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HeliTorque :: View topic - PIO Pilot Induced Oscillation
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HeliTorque Forum Index » Flight Dynamics

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PIO Pilot Induced Oscillation
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Paddy
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PostPosted: Sun May 18, 2008 9:20 am    Post subject: PIO Pilot Induced Oscillation Reply with quote

Any informations about this topic ?
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Vortex
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PostPosted: Sun Sep 21, 2008 9:11 am    Post subject: Reply with quote

What`s PIO???? Rolling Eyes
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WhirlyGuy
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PostPosted: Sun Sep 21, 2008 10:34 am    Post subject: Reply with quote

Vortex wrote:
What`s PIO???? Rolling Eyes


It's in the thread title Wink

Some information here on Wikipedia

Pilot Induced Oscillation

Pretty sure there are a couple of threads on the forum here too about a couple of incidents but can't find them at the moment sorry.

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PostPosted: Sun Sep 21, 2008 11:44 am    Post subject: PIO Reply with quote

Vortex,

Let me see if I can make it a bit simpler. Think of a PIO as an aircraft flying up and down like a roller coaster. This can be caused by two things: Stuctrual instability (which we will not discuss now), and the pilot inputs to the control system.

The most common situation when this occurs is when the pilot looses the "real horizon" and exaggerates control inputs chasing the altimeter in an effort to find level flight.

A new pilot still learning can also enter PIO while learning to scan outside, or later on, interpreting instrument indications on the altimeter or vertical speed indicator.

If the PIO is not halted, the aircraft can go out of control, or suffer severe structural damage if it encounters stong turbulance.

I would say that PIO occurs more in fixed wing aircraft then helicopters.
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