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RNAV Training Manual - Keilir

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How are <strong>RNAV</strong> Procedures different?<br />

1. Definition of Protected Area based on <strong>RNAV</strong> system performance or RNP P A<br />

Based on <strong>RNAV</strong> system type Based on RNP<br />

<strong>RNAV</strong> procedures designated for specific<br />

navigation systems, eg<br />

<strong>RNAV</strong> (GNSS)<br />

ie. FMS GPS only, not<br />

<strong>RNAV</strong> (DME-DME)<br />

panel mount GPS<br />

<strong>RNAV</strong> (EXCEPT CLASS A GNSS)<br />

PANS OPS protected area width is 2x<br />

RNP + a buffer<br />

Buffer is 2nm for arrival, 1nm for initial<br />

and intermediate approach and 0.5nm for<br />

final, missed approach and departure<br />

Full width of Protected Area<br />

Each procedure type has a systemspecific<br />

semi area width , which is the<br />

buffer<br />

4x RNP<br />

buffer<br />

llateral t l protection t ti either ith side id of f the th<br />

nominal track, eg. 3nm for GPS STARs<br />

Buffer<br />

Area<br />

Buffer<br />

Area<br />

Modern approach is to define procedures<br />

based on RNP, RNP not on specific navigation<br />

systems<br />

Fix Tolerance is based on system-<br />

MOC<br />

specific linear Along Track (ATT) and Fix Tolerance is simply a 1x RNP radius<br />

Cross-Track (XTT) tolerances, rather<br />

than angular splays<br />

around the waypoint<br />

See the Eurocontrol publication p Guidance Material for the Design g of Terminal Procedures for Area Navigation g , at http://www.ecacnav.com/downloads/iss3 p _0.pdf p<br />

This is an excellent document, with detailed content on many topics that are only briefly touched upon in this manual. It is well worth downloading and saving as a<br />

reference.<br />

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