The parachute is only opened if the flight is stable and controlled, and opens in 2 stages to slow down and ensure proper opening. In case of a severe loss of control, the wing can be released, it will return to earth under its own parachute that will open automatically, and the pilot will be in the same situation as a normal skydiver. This safety system was used several times with previous wings, but the reliability of this one is much better and it hasn't been needed with it so far.
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