Originally Posted by
hi208
Just to let you know Vmo never changes, it's sort of like Vne on a smaller aircraft. it's Mmo that changes with altitude and variations in temp. Just thought I let you know.
The barber pole on the 1900 indicates Vmo. It changes its position based on altitude and temp, and I believe it's correct name is "Vmo pointer". Our books even list Vmo as changing with altitude. This means a change in the indicated airspeed Vmo occurs at.