Was in the HYA area today on an IFR flight plan. Our clearance took us through R-4101. I checked the enroute chart and it shows the altitude for this airspace as "TO 9000." I assumed this meant from the ground to 9000.
When I questioned Cape about it, he said that airspace was not a factor because we were at 4000.
So what does the "TO 9000" mean? Is 9000 the floor? What's the ceiling?
When I questioned Cape about it, he said that airspace was not a factor because we were at 4000.
So what does the "TO 9000" mean? Is 9000 the floor? What's the ceiling?