To prevent improper use or to limit the use of space at ground level or for aesthetic reasons, the lower flight of a JOMY staircase can be counterbalanced and folded away so that it's hidden. Peopele talk also about "fold away stairs".
Counterbalanced stairs can be engineered completely mechanical or with an electric counterbalanced brake system. This is perfectly doable as the JOMY stairs are made of light weight aluminum.
The JOMY engineers master this very well due to the many years of experience and assure the customer that the stairs will come down very smoothly without damage and this for a lot of years and usage.