Bakersdozen From Canada, joined Nov 2006, 336 posts, RR: 0 Posted (6 years 2 months 4 weeks 20 hours ago) and read 2629 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?
Boysteve From United Kingdom, joined Apr 2004, 917 posts, RR: 0
Reply 1, posted (6 years 2 months 4 weeks 19 hours ago) and read 2526 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?
Thrawn From British Virgin Islands, joined Mar 2002, 53 posts, RR: 0
Reply 2, posted (6 years 2 months 4 weeks 19 hours ago) and read 2483 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