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Features May 2018 Issue

Non-Precision, NA?

This profile view of the vertical descent angle, vertical guidance surface and the 20:1 visual area shows that mitigation of VGS penetrations on a non-precision approach can require an excessive descent angle.

Non-Precision, NA?

Vertically guided approaches are different enough from non-precision approaches that the FAA is struggling to balance the non-precision approach’s risk profile with its utility.

Given a choice, chances are a pilot will pick a vertically guided approach over a non-precision approach. They’re easier to fly and the minimums are almost always lower. From a design perspective they also afford stricter obstacle clearance assurances. What’s not to love? That’s probably what the thought process was like that nearly led to a significant portion of non-precision approaches being cancelled or severely restricted in late 2017.  …

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