Abstract: A three point integrated seatbelt assembly incorporated into a cantilevered stowable seat with an improved dump locking mechanism. The cantilevered stowable seat can be mounted to a vehicle, where space may be selectively provided for positioning a wheelchair or other article adjacent to the stowed seat, which includes a frame attached to the support member, a cantilevered seatbase, and a seatback. The seatbelt assembly allows for easy storage of the seat and safe transportation of a passenger. The seatback is rotatably associated with the cantilevered seatbase by the improved dump locking mechanism, whereby the improved dump locking mechanism enables the seat to remain in the deployed position when inertial forces are placed on the seatback.