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-   -   Aircraft limited to < 85 deg North (https://www.pprune.org/tech-log/486452-aircraft-limited-85-deg-north.html)

Grum 27th May 2012 02:20

Aircraft limited to < 85 deg North
 
My aircraft is limited to operations between North / South 85 degrees, and I would like to know why we can not navigate over the poles. In reality we have no need to do so but I'd like to know the reason.

We have 3 IRS using ring lasor gyros, 2 GPS and FMS using all resources including DME/DME etc

At N75deg the system automatically changes to TRUE north to cope with rapid variation changes.

So why can I not fly over the pole?

Thanks

FlyingStone 27th May 2012 07:30

Perhaps it has do to something with FMS software not being able (or not allowed, since the airline didn't pay enough) to perform calculations near the poles. I don't think the normal FMS can fly something like this. :)

FlightPathOBN 28th May 2012 19:02

http://www.pprune.org/tech-log/38960...-latitude.html

:ok:

Microburst2002 28th May 2012 19:47

Do any airlinera use grid north as a reference for polar navigation?

I mean, true jeading are useless too in the poles. Or they just keep the magenta line with whatever heading is displayed in the ND?

FlightPathOBN 28th May 2012 21:17

I have done a few RNP procedures that use grid north, DeadHorse, AK is one that comes to mind.

Spooky 2 28th May 2012 21:30

The 777 and the 787 both have a Grid Navigation option. Maybe the 747 also, but I'm not sure. I know that Korean Air has developed some modest procedures for this. Not sure who else is using it.

BUGS/BEARINGS/BOXES 28th May 2012 22:44

Diversions are hard to come by. Iqualuit, Thule, erm............. Somewhere with a log fire? And lots of logs! Some aircraft are prohibited to enter the compass unreliable and unusable areas due to certification/ flight testing.

Grum 29th May 2012 01:49

Thanks FlightpathOBN for the link. That seems to explain.

Dan Winterland 29th May 2012 04:50

It disturbs the polar bears.

compressor stall 29th May 2012 12:38


Do any airliners use grid north as a reference for polar navigation?
This should answer your question. The pic has appeared a couple of times before on here. There are also enough clues on the screen to work out where in the world it is to the nearest tens of miles. The bright sparks who have previously answered this are to remain silent. :p

http://i663.photobucket.com/albums/u...03at165630.png


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