Standard Instrument Departure

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A SID (Standard Instrument Departure) is a notified route with instructions to provide a link between a specified aerodrome or runway at that aerodrome and a significant point at which the en-route phase of the flight along a designated ATS route can be commenced.

Noise Preferential Routings

NPR's (Noise Preferential Routings) are part of the noise abatement procedures devised by the airport authority.

NPR's detail the flight path to be followed by a departing aircraft and are included in SID's. All jet aircraft with a MTOW of 5700kg or more are subject to NPR's.

For airfields without SID's, NPR's should be followed after departure.

Purpose

- Segregate traffic operating along different routes and traffic in holding patterns
- Provide adequate terrain clearance
- Detail procedures in the event of RT failure
- Compatible with NPR's
- Allow for uninterrupted climb
- Allow for the performance of the aircraft
- Reduce RT loading