How do I know which airspace requires what RNP value? More specifically, can I go from NY to London with just BRNAV providing I stay above the NAT HLA?

  • $\begingroup$ Check the local AIP. $\endgroup$ Jan 31, 2019 at 16:10
  • $\begingroup$ @J.Hougaard - In the NY–London example, last I checked the US AIP deviates from ICAO and does not list RNP values. $\endgroup$
    – user14897
    Jan 31, 2019 at 16:33

1 Answer 1


For completeness, Please refer to the following website:


Here are some extracts that allow to compare US and European requirements:

US Airspace Requirements

The current US RNP requirements are:

  • RNP-10 as described in FAA order 8400.12c

  • RNP-4 as described in FAA Order 8400.33

  • RNAV (RNP AR) approach authorization as defined in Advisory Circular (AC) 90-101a

  • Basic RNP capability is achieved through TSO-C146 compliant equipment when installed under AC 20-138().

RNP-10 and RNP-4 procedures are limited primarily to oceanic airspace.

RNAV (RNP AR) procedures are available in the US for domestic operations. These procedures require approval, hence the name: Authorization Required (AR), formally known as Special Aircraft & Aircrew Authorization Requirements (SAAAR) procedures.

European Airspace Requirements

There are two existing European RNP requirements:

  • Basic-RNAV (B-RNAV), equivalent to RNP-5 (reference FAA AC 90-45A, AC 20-130, AC 20-138, and AC 25-15)

  • Precision-RNAV (P-RNAV), equivalent to RNP-1.

These requirements are defined in European Aviation Safety Agency (EASA) Temporary Guidance Leaflet (TGL)-10, and FAA AC 90-96A. A statement is required in the Aircraft Flight Manual (AFM) or AFM Supplement (AFMS).

For European operations, a Letter of Authorization (LOA) for all RNP operations, is necessary, as the requirements differ from the FAA requirements.


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