Slight thread creep here but one of the diagrams in the pdf document linked from post 4 rasied a question.
If you look at page 4 figure 6 of the pdf, the scenario is conducting an IAP for rwy 36 with the intention to circle to land on rwy 29. The circling minima can be obtained from the plate for whatever IAP you're executing for rwy 36, fair enough. However say there's an IAP for rwy 29 (the aid could be u/s hence why you're circling, in theory) and the circling minima attached to that IAP are higher, do you still use the rwy 36 minima or the higher rwy 29 minima? Does a higher MDA suggest another obstacle not considered for rwy 36 or do circling minima for any IAP consider the same area regardless of which runway you're intending to land on? If that's the case then why have different minima? Does the approach aid have a bearing on this?
An example of this I found here for Cat A aircraft;
http://www.nats-uk.ead-it.com/aip/cu...GPK_8-7_en.pdf
http://www.nats-uk.ead-it.com/aip/cu...GPK_8-6_en.pdf
Granted it's only 20' but I don't understand why there is a difference, any thoughts?