A NextGen feature reserved for the best-equipped aircraft and crews—required navigation performance (RNP)—is morphing to bring more legacy airliners into the performance-based navigation (PBN) fold.  Called Advanced RNP (A-RNP), the GPS-based navigation capability contains the key benefits of RNP, including curved arrival and departure paths (also known as radius-to-fix, or RF, legs) but without some of the costs and regulatory hassles. RNP operations have gained popularity ...


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