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 |
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. :)
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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? |
I have done a few RNP procedures that use grid north, DeadHorse, AK is one that comes to mind.
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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.
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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.
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Thanks FlightpathOBN for the link. That seems to explain.
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It disturbs the polar bears.
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Do any airliners use grid north as a reference for polar navigation? http://i663.photobucket.com/albums/u...03at165630.png |
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