What is RNP accuracy during flight time?

The accuracy of RNP (Required Navigation Performance) during flight time refers to how closely an aircraft can navigate to its intended flight path. The correct choice indicates that the RNP accuracy is specified as 0.3 nautical miles (NM) with a tolerance of ±0.3 NM for 95% of the flight time.

This means that in 95% of the flight period, the aircraft's actual position will be within a range of 0.3 NM from the designated flight path. This level of accuracy is significant for aviation safety and is critical for operations in airspace that demands precise navigation, such as in busy or congested airspace or during approaches and landings at airports.

Knowing that this accuracy is maintained for a large percentage of flight time highlights the reliability and performance of the navigation system being utilized. Accurate navigation is essential to ensure separation from other aircraft and to adhere to prescribed air traffic control instructions, thus enhancing overall safety in the skies.

The other choices reflect different levels of accuracy for varying percentages of flight time, which may not be suitable for all operational needs in aviation where high precision is crucial.