Many of us flying with GPS units like the Garmin GNS400/500W navigators may not see this procedure in the database, but it may appear among the updated charts you receive from Jeppesen or FAA AeroNav Products. Although that procedure is not labeled RNP AR, one transition (from VISTA) includes an RF (radius-to-fix) leg, a curved path that resembles a DME arc, but which requires specific equipment to fly–see below. The situation is becoming more complicated with the publication of RNAV approaches such as the RNAV (GPS) X RWY 24 at KCRQ (see below).
For more information about AC 90-119, see Draft AC 90-119 Performance-Based Navigation Operations. For many reasons, those approaches (now called RNP AR procedures) are currently off-limits to a typical IFR pilot flying an airplane equipped with a WAAS-capable, IFR-approved GPS.įAA is preparing a new Advisory Circular that addresses some of the issues discussed in this post. Some pilots remain confused about GPS-based RNAV approaches, especially procedures with RNP (Required Navigation Performance) in the title and AUTHORIZATION REQUIRED (AR) notes on the chart.
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