I got a question about the MSAMinimum Sector Altitude (MSA) on Jeppesen arrival plate (RCTP 20-2). The MSA circle was divided into three sectors with three altitude before:
... (2008, top image), but I found that it becomesis only one altitude (not divided anymore) on the new version:
I've been looking for the reason for a long time but still can't figure it out. Does anyone know why they did such the change?