What accuracy does RNP 5 (Required Navigation Performance) require?

RNP 5 (Required Navigation Performance) specifies that an aircraft must be able to navigate with a lateral accuracy of ± 5 nautical miles for 95% of the flight time. This means that while the aircraft is in operation, it must be capable of maintaining this level of navigation performance most of the time, ensuring safe, reliable, and predictable positioning in relation to its intended route.

The requirement reflects the need for a certain degree of accuracy to support operations in areas where navigation is critical, enhancing safety and efficiency. This standard is important for flight operations within controlled airspace where precision tracking is essential, such as when flying approaching or departing from an airport.

In contrast, other options would imply a different level of performance that does not meet the established criteria for RNP 5. For instance, the option stating a ± 5 NM accuracy for 99% would suggest a stricter requirement than RNP 5 entails, while any option indicating a lesser accuracy, such as ± 0.5 NM or a different percentage, does not align with the specifications laid out for RNP 5.