vh-foobar
22nd Jun 2016, 14:07
I understand the basics of PAN-OPS approach design etc (and TERPS though not relevant to Aus)
However, I have never understood how some circling MDAs were calculated, I had assumed that in certain cases additional height was added using some additional heuristic. I believe PAN-OPS allows for this.
I can think of a few examples, though Wollongong is perhaps a good example relating to my question.
The original NDB approach has MDA of 1809 ft HAA. I would have guessed that this is based on the missed approach segment.
The newer RNAV approaches have a much lower straight in MDA of 888ft HAT (RWY 16) and 1309ft HAT (RWY 34), yet the circling MDA remains at 1809 ft HAA.
Given the obstacles in the circling area and my limited knowledge of PAN-OPS criteria, I would have thought the circling MDA would be lower than 1809ft, in fact similar or the same as the straight in MDA.
So my questions is, are some circling MDAs in Australia increased based on some additional safety criteria not specifically in PAN-OPS.
Notes on a postcard...
I have attached the charts, and here are the links to them:
NDB (http://www.airservicesaustralia.com/aip/current/dap/WOLNB01-142.pdf)
RWY16 (http://www.airservicesaustralia.com/aip/current/dap/WOLGN01-142.pdf)
RWY32 (http://www.airservicesaustralia.com/aip/current/dap/WOLGN02-142.pdf)
However, I have never understood how some circling MDAs were calculated, I had assumed that in certain cases additional height was added using some additional heuristic. I believe PAN-OPS allows for this.
I can think of a few examples, though Wollongong is perhaps a good example relating to my question.
The original NDB approach has MDA of 1809 ft HAA. I would have guessed that this is based on the missed approach segment.
The newer RNAV approaches have a much lower straight in MDA of 888ft HAT (RWY 16) and 1309ft HAT (RWY 34), yet the circling MDA remains at 1809 ft HAA.
Given the obstacles in the circling area and my limited knowledge of PAN-OPS criteria, I would have thought the circling MDA would be lower than 1809ft, in fact similar or the same as the straight in MDA.
So my questions is, are some circling MDAs in Australia increased based on some additional safety criteria not specifically in PAN-OPS.
Notes on a postcard...
I have attached the charts, and here are the links to them:
NDB (http://www.airservicesaustralia.com/aip/current/dap/WOLNB01-142.pdf)
RWY16 (http://www.airservicesaustralia.com/aip/current/dap/WOLGN01-142.pdf)
RWY32 (http://www.airservicesaustralia.com/aip/current/dap/WOLGN02-142.pdf)