![]() ![]() RNP procedures rely solely on satellite based navigation (GPS) and, therefore, use linear obstacle evaluation areas for procedure design and determination of approach minimums. For the purpose of procedure design, RNP represents the navigation performance required to maintain flight within the obstacle evaluation area associated with the procedure. ![]() continued on page 2Ģ Required Navigation Performance from cover story In general terms, an approach with a specified RNP value means the perpendicular distance between the course centerline and the nearest obstacle must be at least 2X the RNP value specified for the approach. The result is a lower approach minimum because obstacles that were previously considered using the trapezoidal method are no longer a factor when using linear containment criteria specified for RNP.įor example, an approach with an RNP value of 0.3 means that the closest obstacle perpendicular to the course centerline must be no closer than 0.6 NM away. The figure below depicts the differences in the obstacles clearance areas for traditional, RNP and RNP AR (procedures that require special approval to fly) procedures.
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