Aircraft limited to < 85 deg North
Thread Starter
Join Date: Jul 2004
Location: Never sure
Posts: 150
Likes: 0
Received 0 Likes
on
0 Posts
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
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
Join Date: Apr 2010
Location: IRS NAV ONLY
Posts: 1,230
Likes: 0
Received 0 Likes
on
0 Posts
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. 
Join Date: Mar 2011
Location: engineer at large
Posts: 1,409
Likes: 0
Received 0 Likes
on
0 Posts
Join Date: Mar 2005
Location: Uh... Where was I?
Posts: 1,338
Likes: 0
Received 0 Likes
on
0 Posts
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 mean, true jeading are useless too in the poles. Or they just keep the magenta line with whatever heading is displayed in the ND?
Join Date: Mar 2007
Location: USofA
Posts: 1,235
Likes: 0
Received 0 Likes
on
0 Posts
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.
Join Date: Nov 2006
Location: the OFCR......and probably somewhere over China zzzzzzzz
Posts: 219
Likes: 0
Received 0 Likes
on
0 Posts
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.
Do any airliners use grid north as a reference for polar navigation?
Last edited by compressor stall; 29th May 2012 at 13:12.
