Explain RNP

• A. Required Navigation Performance; requires a specific level of accuracy from all navigation systems
• B. Required National Procedure; standard flight path for NDB approaches
• C. Radial Navigation Protocol; used for VOR radials
• D. Regular Navigation Process; recommended but not required

Answer: (A)

RNP stands for Required Navigation Performance. It is a performance-based navigation specification used in PBN that defines the level of accuracy, integrity, and update rate required for a given flight path. The aircraft’s navigation system must determine its position with a defined lateral accuracy and continuously monitor its own performance, providing alerts if the aircraft drifts outside the allowed containment. This capability lets airspace be designed more efficiently and enables precise procedures, such as tighter approaches, by ensuring the aircraft stays within a specified tolerance from the intended path. The tolerance is expressed as an RNP value (for example, a small number means tighter containment). In practice, some routes or procedures may require an RNP authorization (AR) to operate, reflecting the added on-board monitoring and procedural requirements. Other choices refer to national procedures or general nav methods that do not capture the performance-based, self-monitoring aspect central to RNP.