Weekly tips, technique and training from IFR.

Features August 2013 Issue

Obstacle Clearance

If approaches with vertical guidance are better than those without, how can some LNAVs take you lower than the LNAV/VNAV for the same procedure?

When we think of GPS-based instrument approaches, we usually lump all the approach minima into a single “GPS approach” bucket. We tend to mentally order the types with WAAS as better than non-WAAS, and vertical guidance better than those without. After all, that’s how the magic box picks the type of service to provide. …

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