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| Required Navigation Performance |
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| NRP Approach Chart |
The term RNP is also applied as a descriptor for air-the capability of both the available infrastructure (navigaspace, routes, and procedures — including departures, tion aids) and the aircraft. Washington National Airport arrivals, and instrument approach procedures (IAPs). (KDCA) introduced the first RNP approach procedure in The descriptor can apply to a unique approach procedure September 2005. An example of an RNP approach chart or to a large region of airspace. RNP applies to navigation is shown in Figure 1-12.
The RNP value designates the lateral performance requirement associated with a procedure. The required performance is obtained through a combination of aircraft capability and the level of service provided by the corresponding navigation infrastructure. From a broad perspective:
Aircraft Capability + Level of Service = Access
In this context, aircraft capability refers to the airworthiness certification and operational approval elements (including avionics, maintenance, database, human factors, pilot procedures, training, and other issues). The level of service element refers to the NAS infrastructure, including published routes, signal-in-space performance and availability, and air traffic management. When considered collectively, these elements result in providing access. Access provides the desired benefit (airspace, procedures, routes of flight, etc.).
A key feature of RNP is the concept of on-board monitoring and alerting. This means the navigation equipment is accurate enough to keep the aircraft in a specific volume of airspace, which moves along with the aircraft. The aircraft is expected to remain within this block of airspace for at least 95 percent of the flight time. Additional airspace outside the 95 percent area is provided for continuity and integrity, so that the combined areas ensure aircraft containment 99.9 percent of the time. RNP levels are actual distances from the centerline of the flight path, which must be maintained for aircraft and obstacle separation. Although additional FAA-recognized RNP levels may be used for specific operations, the United States currently supports three standard RNP levels:
- RNP 0.3 – Approach
- RNP 1.0 – Terminal
- RNP 2.0 – Terminal and En Route
For international operations, the FAA and ICAO member states have led initiatives to apply RNP concepts to oceanic routes. Here are the ICAO RNP levels supported for international operations:
- RNP-1 – European Precision RNAV (P-RNAV)
- RNP-4 – Projected for oceanic/remote areas where 30 NM horizontal separation is applied
- RNP-5 – European Basic RNAV (B-RNAV)
- RNP-10 – Oceanic/remote areas where 50 NM lateral separation is applied
