The Float Bag determined the Max Height the aircraft could fly as it expanded as you climbed to altitude. First indication you had gone too high was the Tail Rotor Pedals would not move as the bag swelled against the cables.
One could use that method as a way of creating Pedal Stops and footrests on long transits. So the Big Boys always told me anyway!
I loved the old Sikorsky's I got to fly....lovely old Girls!