Has a Pixhawk ever been used in a full scale, general aviation or experimental aircraft?
Yes.
BUT see license terms with regards to putting an AP in control of human life
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I thinked to install in an ULM, copter or plane, but the cost probably is too much for servos ecc, and the risk of crash is hight; I think is possible only for a Company with money, infrastructure and people sufficient, like there are copter drones like Airbus probably eqipped with other software
There were multiple simulated full scale aircraft controlled by Ardupilot 
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Putting Ardupilot in control of a manned or passenger carrying aircraft is prohibited by the terms of use.
Yes, ArduPilot has been used at large scale. It is also used as a ride-along datalogger (such as recording aerobatics routines for later analysis).
As others have said, it shall not be used in control of manned aircraft, and this topic will be closed if that is the intent.
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Sorry, I should have stated: “unmanned full scale aircraft.” I have seen videos of an unmanned, full scale, Piper Cub style aircraft under power of quadplane-style gas engines on booms - eight of them, I think. It seemed a bit under-powered, but it actually did fly. I think it was before the advent of large brushless motors and flight controllers like the Pixhawk. I think it was about ten years ago. I was wondering if a more recent unmanned aircraft with brushless motors and a flight controller had been attempted. It seemed like a natural progression to me. But you say that it has actually been done already? Where, when, and by whom?
Here’s a well known example of ArduPilot at fairly large scale: