Weekly tips, technique and training from IFR.

Features January 2015 Issue

AC 90-108 Conundrum

AC 90-108 Conundrum

Most of us use RNAV (GPS) as a primary navigation source. It can even make intercepting final on an approach a breeze, but not a localizer approach unless we get creative.

The FAA’s Advisory Circular 90-108 just feels wrong. In it, section 8 itemizes circumstances where a “suitable RNAV system” (including GPS and GPS/WAAS equipment) cannot be used.

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