A Springlock Failure is the event in which a Springlock
Suit's spring
loaded devices keeping the animatronic as a suit snaps shut, resetting it back into an animatronic with a wearer inside, typically crushing the wearer to
death. Springlock Failures are often caused by moisture, heavy breathing, or failure to correctly set up the springlocks.
"And if you trigger those spring locks, two things
will happen: first the locks themselves
will snap right into you, making deep cuts all over your body, and a split second later, all the animatronic parts, all that sharp steel and hard plastic
will instantly be driven into your body. You
will die, but it
will be slow. You’ll feel your organs punctured, the suit will grow wet with your blood, and you will know you’re dying for long, long minutes. You’ll try to scream, but you will be unable to: your vocal cords will be severed, and your lungs will fill with your own blood until you drown in it." -William Afton describing a Spring lock Failure, The Silver Eyes