A320 Magenta Donut
Hi all
I'm doing the A320 type rating course at the moment and during our Circling approach lessons, we were introduced to the "Magenta Donut" which you follow vertically after activating the SEC FPLN(with opposite runway) when breaking off an instrument approach.
We were taught to follow the donut all the way down to the runway. But... I couldn't find any reference in the FCOMs/FCTM to the actual vertical/horizontal path algorith for the computation of the donut profile.
My understanding is that it's nothing but a normal VDEV indication that represents FMGC vertical path, but is it buiding 3degree path streching up from the threshold assuming a certain turning radii and final leg distance?
Thanks