Is there anyone here who has done international flying and is familiar with a 2 NDB approach? I've seen that they are common in South America, Russia, and the Balkans. From what I understand, there will typically be 3 different sections of minimums published; two if you're just using a single NDB (one of the two), and the other if you use both NDBs simultaneously (with lower minimums of course). Thinking about it, this type of approach wouldn't be very difficult to fly on the final approach course if you're using a twin needle RMI or even movable card indicator, since all you're doing is trying to keep the two needles overlaid (no mental math!). However, there have been several incidents in the past where famous people have been killed while their pilots fly these approaches.
I am just curious about procedure regarding this type of approach. For instance, if you're using both NDBs simultaneously, you would have to monitor the identification of both NDBs simultaneously....so are the two NDB identification signals synchronized so as to ensure they alternate with one another (I could see overlapping as being both undesirable and un-certifiable)? Any input would be greatly appreciated and I understand there might be few if any individuals with this kind of experience on this forum.
I am just curious about procedure regarding this type of approach. For instance, if you're using both NDBs simultaneously, you would have to monitor the identification of both NDBs simultaneously....so are the two NDB identification signals synchronized so as to ensure they alternate with one another (I could see overlapping as being both undesirable and un-certifiable)? Any input would be greatly appreciated and I understand there might be few if any individuals with this kind of experience on this forum.