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RNAV Training Manual - Keilir

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Principles of traditional Instrument Procedure design<br />

1. The Protected Area<br />

Instrument procedures in Europe are designed using the specifications and criteria in ICAO PANS-<br />

OPS Doc 8168. 8168 The US equivalent standard is TERPS (United States Standard Terminal Instrument<br />

Procedures)<br />

Profile of Protected Area Plan View of Protected Area<br />

Full width of Protected Area<br />

¼ width ½ width<br />

¼ width<br />

Secondary<br />

Area<br />

Primary<br />

Area<br />

Full u<br />

MOC<br />

Secondary<br />

Area MOC<br />

declines<br />

to zero<br />

Secondary<br />

Area<br />

Primary<br />

Area<br />

Secondary<br />

Area<br />

The key design criteria is to provide safe obstacle and terrain clearance whilst an aircraft is flown in<br />

accordance with the published procedure<br />

horizontally, o o ta y, within t a Protected otected Area ea<br />

vertically, with a specified Minimum Obstacle Clearance (MOC)<br />

18

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