What is the RNP requirement for enroute phase?

The required Navigational Performance (RNP) for the enroute phase is 2 nautical miles (NM). This requirement is established to ensure that an aircraft can navigate safely within the airspace while adhering to the specified accuracy standards. During the enroute phase of flight, the aircraft operates within airways and routes that have defined lateral boundaries. A 2 NM requirement allows for adequate margins, taking into account navigational uncertainties and ensuring safety for aircraft operating close to one another in the system.

RNP values indicate the accuracy with which an aircraft's position is determined and maintained. A RNP of 2 NM guarantees that the aircraft can maintain its position within 2 NM of the intended flight path, factoring in both the precision of onboard systems and environmental influences. This level of precision is sufficient to support the navigation needs of modern air traffic, even in more complex airspace environments. Moreover, meeting this requirement is essential for compliance with air traffic control (ATC) directives and safety protocols.