Although there are straight-in-landing and circle-to-land minimums in the VOR Z chart, why was a separate VOR A chart created containing only the circle-to-land minimum? When we examine the chart images of Çorlu airport that I have shared below, although there are circle-to-land values at the bottom right of the VOR Z Rwy 04 chart, a separate VOR A chart was created using only these values. I don't understand why a separate VOR A chart was created specifically for these minimums, although there is already a chart where these values are specified. To be able to fly without using DME or just to perform a visual descent? I already know that only circle-to-land minimums are used in VOR A, B, C.. charts, but I am not sure what the reason for a separate VOR A chart is for this airport, I would appreciate your help.
The only relevant difference I can see is
- DME required.
for the VOR Z approach. The VOR A does not have such a requirement. This allows aircraft without DME to fly the VOR approach.
Note how the outbound leg from the VOR is flown differently. On the VOR Z you fly out to a DME of 7.0 before turning back in (even when later flying a circle-to-land):
On the VOR A the outbound leg is a timed leg of 2 or 3 minutes depending on the aircraft approach category:
Since this is less accurate, the platform altitude was also increased from 2000 to 2300 feet, probably to ensure sufficient terrain clearance when ending up further out than 7 NM for the turn.