If the seat can be removed from the frame, the fastening devices to anchor the seat to the frame must be designed so as to prevent the seat from being inadvertently detached from the frame.
Kui istme saab raamist eemaldada, peavad istme raami külge kinnitamise seadised olema konstrueeritud selliselt, et iste ei tuleks juhuslikult raami küljest lahti.