Envelope Protection Comes to GA
Systems from Garmin and Avidyne that aim to prevent loss-of-control accidents are already showing up in light airplanes. Here's how one of them might just save your life.
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In this composite photograph, we show the envelope protection capabilities of the Avidyne DFC90 autopilot. The display, from my flight in a Cirrus SR22 with Avidyne's Jake Jacobson, shows us in a steep, nose-down spiral with the airspeed building and a rate of descent of approximately 4,000 fpm. The autopilot annunciation of "straight and level" indicates that this emergency recovery button has been selected as the active mode on the autopilot, something I'd done just seconds before I took the photograph. In fact, a moment later, the airplane had recovered to straight-and-level flight without pulling more than 2.2 G's in the process.
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