getting to grips with RNP AR Required Navigation Performance(4)

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This concept is used en route, to reduce aircraft separation, and in terminal area to optimize
arrival and departure procedures. The utmost development of Performance Based Navigation
for approach, missed approach and departure is known under different names.
FAA initially referred to RNP SAAAR Operations, SAAAR standing for Special Aircraft and
Aircrew Authorization Required.
ICAO now refers to RNP Operations with Authorization Required (RNP AR).

In this document we will use preferably the acronym RNP AR, instead of RNP SAAAR, which
has an equivalent meaning.
Compared to standard RNAV approach procedures, the RNP AR approach procedures are
characterized by:

.  
RNP values ≤ 0.3 NM and/or

.  
Curved flight path before and after the Final Approach Fix (FAF) or Final Approach Point.

.  
Protections areas laterally limited to 2xRNP value without any additional buffer.

These approach procedures are always designed to be flown with baro-VNAV capability.
RNP AR operations may include missed approach procedures and instrument departures
with reduced RNP (<1NM).
The RNP AR operations are accessible to aircraft and operators complying with specific
airworthiness and operational requirements.

This brochure aims at providing Airbus customers with the background information
necessary to launch an RNP AR project.

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2.  Background

 

2. BACKGROUND
The RNP concept has already a long history. It has been developed by different organizations (ICAO, FAA, JAA/EASA, RTCA,…) for different types of use. This multi-path history had the unfortunate effect that the acronym RNP (Required Navigation Performance) is related to different definitions with different levels of performance for different uses.
To illustrate this situation, we can mention the following uses of the RNP acronym:
.  For enroute and in terminal area, we can see reference to an RNP, which is only a level of navigation accuracy, for example:
o  RNP 10 in oceanic area

o  RNP 1 or 2 in terminal area

Note: ICAO proposes now to use terms such as RNAV-1, or RNAV-2 for operations in terminal area with navigation accuracy requirements. 
.  RNP definition of the “Minimum Aviation System Performance Standards” (MASPS) EUROCAE/RTCA ED-75/DO-236
o  This definition includes requirements for:
.. Accuracy of navigation,
.. Integrity of containment,
.. Continuity of containment.

o  Equipment complying with this standard can fly RNP 0.3 RNAV approach procedures sometimes called RNP RNAV or RNP APCH, or basic RNP

Note: The terminology for this type of approach is still under discussion (early 2008)
.  RNP definition of the FAA SAAAR requirements or ICAO Performance Based Navigation Manual (PBN Manual)
　
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