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Polar Route (pre-clearance Checklist?)  
User currently offlineBakersdozen From Canada, joined Nov 2006, 336 posts, RR: 0
Posted (7 years 2 days 17 hours ago) and read 2882 times:

Regarding the flying of aircraft over the arctic on the "polar route." I was reading an article in AC's enRoute magazine which said the polar route can't always be flown due to cold weather and other factors.

Is this true anyone know what these factors are? I would have assumed that the normal -70 temps of flying at 40 000 feet wouldn't be much worse flying of the arctic.

Anyone know some of the checklist variables before a flight is allowed clearance over the arctic?

4 replies: All unread, jump to last
User currently offlineBoysteve From United Kingdom, joined Apr 2004, 956 posts, RR: 0
Reply 1, posted (7 years 2 days 16 hours ago) and read 2779 times:

Quoting Bakersdozen (Thread starter):
Is this true anyone know what these factors are? I would have assumed that the normal -70 temps of flying at 40 000 feet wouldn't be much worse flying of the arctic.

The atmosphere is thinner at the poles, flying at 40,000 feet on a polar route would put the aircraft in a different layer of the atmosphere compared to normal. Is this a factor at all?

User currently offlineThrawn From British Virgin Islands, joined Mar 2002, 53 posts, RR: 0
Reply 2, posted (7 years 2 days 16 hours ago) and read 2736 times:

The fuel freeze point has to be considered as at some airports in the USA they only have JET A (-40 C)
and not JET A1 (-47 C)
So the fuel freeze point is checked before flight to establish the freeze point of the day

You don't want the fuel freezing in the wings in flight

User currently onlineLawnDart From United States of America, joined May 2005, 975 posts, RR: 3
Reply 3, posted (7 years 2 days 12 hours ago) and read 2530 times:

As pointed out, fuel freeze is a concern of polar flying...pockets of very cold air tend to form in the far northern latitudes, and flying through it can cause problems with your fuel.

Solar radiation is another issue...I've never seen a problem with it, but it can happen (can cause health problems with long exposure, communication problems).

And that's the third issue I can think of...you can loose communications.

User currently offlineSoBe From United States of America, joined Oct 2004, 256 posts, RR: 1
Reply 4, posted (7 years 1 day 18 hours ago) and read 2218 times:

Among other things, the availability and suitability of alternates is an issue. The alternate has to have facilities to care for the crew and passengers.

Here is some info on Polar ops http://www.boeing.com/commercial/aer...zine/aero_16/polar_story.html#fig1

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