Definition
RNP Operations are area navigation (RNAV) operations that include onboard performance monitoring and alerting. The aircraft's navigation system continuously checks how accurately it is flying the intended path and warns the pilot if the required level of accuracy cannot be met. Each RNP procedure is assigned a numerical value (such as RNP 1.0 or RNP 0.3) that defines the lateral accuracy, in nautical miles, the aircraft must maintain at least 95 percent of the flight time.
Plain English
Flying a route or procedure where the aircraft's navigation system not only guides the airplane along a precise path, but also keeps an eye on its own accuracy and alerts the pilot if it drifts outside the allowed margin.
Context Anchor
Seen in instrument flying, especially on area-navigation routes and procedures where the chart, clearance, or procedure specifies an RNP requirement.
Derivation
The term combines 'required' (what must be achieved), 'navigation performance' (how well the aircraft tracks its intended path), and 'operations' (the flying activity itself). The phrase signals that performance is not just expected -- it is required and must be verifiable in flight.
Why Pilots Care
Enables more direct routes, lower fuel use, and access to procedures in areas without ground navigation aids.
Intuition Check
RNP is not just another name for GPS navigation. The key feature is that the aircraft must monitor its navigation accuracy and alert the pilot if the required performance is not being met.
Example Sentence 1
The crew confirmed the aircraft was approved for RNP operations before accepting the RNP 0.3 approach into the mountain airport.
Example Sentence 2
Before departure the dispatcher confirmed the aircraft was equipped for RNP Operations on the planned arrival.