(The charts have so many notes that the plan view area is compressed just to make room. The Z version has a DA 600 feet lower but requires 370 feet per NM on the missed. The Y and Z versions of the ILS or LOC/DME Rwy 19 at Rutland, VT (KRUT, pictured above) are poster children. Many times the version w the Z allows lower minimums by requiring a higher climb gradient for the missed. Letters from the tail end of the alphabet (X, Y, and Z) are used only to identify multiple approaches to the same runway. The VOR/DME-A KAUG falls in the third category. This happens when the final approach course doesn’t align within 30 degrees of a runway, the descent from MDA to the runway would be too steep for a straight-in, or the runway environment lacks required items for straight-in minimums. Replacing a specific runway with a letter in the title means only circling minimums are available. (Granted, these were also the days when a cell phone’s only function was making phone calls. Skip to the video to avoid the trap, or read on to see why and how you may have been reading approach charts wrong for years.īack when I learned instrument flight, the only single letters that appeared in approach titles were from the beginning of the alphabet, such as the VOR/DME-A approach to Augusta, ME (KAUG).
Spoiler alert: This discussion reveals a trap when using GPS for DME on a localizer approach. Now come down the rabbit hole with me to understand why that’s true and see how GPS and digital tech, in general, is changing how we do IFR. The note says: “GPS and DME required” (emphasis mine).Ĭan’t GPS be used in lieu of DME? Of course it can (per restrictions in AC 90-108 and the AIM), and you can fly this approach with only an approved GPS.
It all started with a weird note on the ILS Z or LOC Z Rwy 23 at Walterboro, S.C. If you don’t have time for the whole thing, skip to the video and see how this affects which approach you load and who you buy your data from. It’s funny how a simple question can snowball and become a deep dive into our changing approach environment.
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