What happens when a helicopter experiences engine failure midair?
In: Engineering
The rotating mass of metal fatigue surrounded by an oil leak finds its zipcode in which to have an NTSB investigation.
OK, serious answer: [Autorotation](https://en.wikipedia.org/wiki/Autorotation) is the maneuver and principle by which a helicopter that has had an engine failure can glide to a *mostly controlled* landing.
Short of a failure catastrophic enough to seize the rotor (preventing the blades from rotating and robbing the helicopter of its mechanism for developing lift) a helicopter that has had an engine failure can usually be landed relatively safely as long as there’s adequate clear ground in the autorotation glide path.
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