A removable and/or mountable seat assembly includes a seat back and a seat pan that are pivotally connected to each other via a locking device and rotate about at least one common axis of rotation. The locking device is in mechanical communication with the seat back and the seat pan and is configured to lock the seat back and the seat pan relative to each other about the at least one common axis of rotation. The locking device is configured to selectively lock the seat pan and the seat back such that the seat back and the seat pan lie along the common plane forming the stretcher or selectively lock the seat pan and the seat back such that the seat back and the seat pan form a seat. Additionally, the seat back and the seat pan may be locked in yet another position allowing for the easy transport and/or storage of the seat assembly.
