zarniwoop
Posts: 255
Joined: Wed Apr 27, 2005 11:43 pm

GPS/RNP Approaches

Thu May 11, 2006 4:01 pm

Did a search so I apologise if its already been posted....

An interesting video from westjet on flightglobal.com about the benefits of GPS/RNP approachs.

http://www.flightglobal.com/Articles...quired+navigation+performance.html

Seems like Canada is taking up GPS/RNP approaches quicker than most places (correct me if I am wrong), is this due to the nature of the terrain?
Do you think these approaches will become wider spread? From what I understand you need extra equipment and training but if it lowers minimums and increases safety I guess it is worth the investment.

Comments?
 
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zeke
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Joined: Thu Dec 14, 2006 1:42 pm

RE: GPS/RNP Approaches

Thu May 11, 2006 5:25 pm

Quoting Zarniwoop (Thread starter):
Seems like Canada is taking up GPS/RNP approaches quicker than most places (correct me if I am wrong), is this due to the nature of the terrain?

Australia has had a wider implementation of the approaches as the domestic DME frequency spectrum was sold off for TV broadcast. One of the concessions was a replacement of the system with GPS.

The Australian GPS approach design was adopted by ICAO as the international standard. They are straight in approaches.

US designed approaches initially were just overlays of existing NDB or VOR approaches.

The have approaches to many airports where the only approach available is GPS, also have approaches to oil rigs, hospitals, roads (outback highways for the flying doctor) by GPS.

The QF 737s have been doing RNP 0.1 approaches into an airport in New Zealand, I cannot remember which one.

Quoting Zarniwoop (Thread starter):
Do you think these approaches will become wider spread? From what I understand you need extra equipment and training but if it lowers minimums and increases safety I guess it is worth the investment.

In my view they will, with WAAS they will end up replacing the ILS in my view, MLS implementation was put to the halt with the same view. Each ILS costs about 1 million dollars a year to maintain.

For a non precision approach, they can provide detailed straight in approaches, and miss procedures.
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Pihero
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Joined: Mon Jan 31, 2005 5:11 am

RE: GPS/RNP Approaches

Fri May 12, 2006 8:17 am

Just about everybody is now experimentying with GNSS -Global navigation satellite system - approaches.(That's the offgicial name for it)
Here, it is a very cautious process as the presentation on the flight instruments could lull pilots into an excessive sense of safety (There is a centerline and a glide slope .
There are a few test approaches at CDG, flown by volunterr and approved aircrews.The minima are comparable to the VOR-DME let-downs and the preparation is heeeeeaaaaavvvvvyyyy! As a matter of fact and in future SOPs, it would just be a matter of checking the satellites available and the required performance (.1 Nm at the moment).
Once more I agree with Zeke that it will end up replacing the ILS, but not too soon for cat III minima (In my opinion, we'll need the differential GPS and Gallileo for that).
This seems to be the answer to third world countries airport investment, too.
(After all, it's the simplest task to draw a straight-in approach path into any airfield, even a football pitch or ,as already been tried a helicopter pad.).
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