This is the aircraft’s ability to meet navigation requirements, indicated by a number (e.g., RNP-10, RNP-4, etc.). The number refers to the navigation equipment’s accuracy, measured in the maximum distance (NM) that a sensor may deviate for 99% of the phase of flight in which the RNP specification is set.
Aircraft are required to have an oceanic RNP Letter of Authorization (LOA) to operate on most oceanic routes (e.g., RNP-10/4/2). RNP operations in other phases of flight may require an LOA as well, per the International Civil Aviation Organization (ICAO)’s categorization of PBN operations.
