RNP2

RNP2, or Required Navigation Performance 2, is a navigation specification within the ICAO framework for Performance-Based Navigation (PBN). It defines the level of lateral containment an aircraft must maintain along an approved route, namely within 2 nautical miles of the centerline for the majority of the flight, typically expressed as a specified confidence level over the flight time.

Purpose and scope

RNP2 is used primarily for en-route and certain oceanic or remote airspace where surveillance and ground-based navigation aids are limited. It enables more efficient route design, improved airspace capacity, and better predictability for air traffic management by allowing aircraft to fly precise tracks without continuous ground-based guidance.

Requirements

To operate under RNP2, an aircraft must be equipped with an approved RNAV system capable of achieving the required lateral accuracy and sustaining it along the route. Operators must obtain an authorization or approval in their operations specifications demonstrating the ability to perform RNP2 navigation. The on-board navigation system is expected to monitor performance and provide alerting if containment cannot be maintained, so crews can take timely corrective action. RNP2 does not by itself require ground-based navigation aids, but it relies on properly defined routes and waypoints that support the intended containment.

Operational use

RNP2 routes are published as part of national or international airspace structures and may be designated as RNAV tracks or ATS routes. Operators must maintain ongoing compliance, including training, data integrity, and regular verification of navigation performance. RNP2 offers a balance between navigation precision and operational flexibility suitable for broad en-route coverage in areas where more stringent specifications are not required.

See also

RNP, RNAV, PBN, ICAO.