Originally Posted by
AerocatS2A
The 1312' spot height is within 3NM of the southern threshold so it has to be at least 1612' for Cat B. The 2034 spot height, while not within the circling area, is close, and I suspect that might be responsible for the circling minima. What navigation tolerances are applied to circling area calculation? A 1NM tolerance would bring the hillside ramping up to that 2034' peak into play.
I thought the 1312' spot height was outside the circling area, or at least it could be using PAN-OPS criteria where a sector is used to prohibit circling. I understand Australia differs in this area, such that the prohibited area is reduced by a minimum of 2nm or more, in effect increasing the circling area. I don't think the high ground to the south west is within the 2nm.
Though my point was not to quibble, it's more related to an additional subjective criteria applied as a safety margin.