 Even where only a Type I slide is fitted it has sufficient buoyancy to act as an aid in the event of a water landing.A Type III inflatable ramp is a small platform that may be fitted to allow easy assess from, for example, an over-wing wing exit door to an area of structure from where descent can be achieved either by a separate slide or by jumping, depending on the height.Type IV combines the ramp and slide into a single functional unit.