Cancidas From Poland, joined Jul 2003, 4112 posts, RR: 10
Reply 3, posted (10 years 4 months 1 week 6 days 10 hours ago) and read 3115 times:
a deicing event is declared at any time where the tempurature is low enough that an airplane sitting at the gate would accumulate ice. if the temp is -30C but there is no precip whatsoever you don't need to deice.
"...cannot the kingdom of salvation take me home."
OPNLguy From , joined Dec 1969, posts, RR:
Reply 4, posted (10 years 4 months 1 week 6 days 10 hours ago) and read 3075 times:
>>>a deicing event is declared at any time where the tempurature is low enough that an airplane sitting at the gate would accumulate ice. if the temp is -30C but there is no precip whatsoever you don't need to deice.
That may well be, but there are plenty of times when it's cold outside and there's no precip falling at the airport, but the aircraft has picked up (and still has) ice from the descent, primarily on the leading edges of the vertical and horizontal stabilizers...
As such, a de-icing event might be better described as being any time one has to remove any frozen precip from the aircraft, no matter when it attached itself to the airframe...
Njdevilsin03 From United States of America, joined Apr 2004, 732 posts, RR: 0
Reply 7, posted (10 years 4 months 1 week 6 days 5 hours ago) and read 3011 times:
I've never been on a plane that's deiced before and i wanna see what it's like. I flew out of Boston once it was in the mid 20s but clear and we were de iced. But I am flying in and out of Philly this coming weekend and on monday it is showing cold windy snow and in the 20s and was thinking maybe Ill get to experience it then.
Air2gxs From , joined Dec 1969, posts, RR:
Reply 11, posted (10 years 4 months 1 week 5 days 21 hours ago) and read 2987 times:
I've seen aircraft de-iced in the high 40s (F). The critical component is really visible precip. A cold soaked fuel tank can lower the temperature of the wing substaintially, when precip comes in contact with that wing it will freeze. Now, I'm not saying a rainstorm, I'm talking fog, mist, light drizzle. Lower levels of precip. (though with high humidity) with declining temeratures equals need for de/anti-ice.
SparkyN501 From United States of America, joined Jun 2004, 52 posts, RR: 1
Reply 12, posted (10 years 4 months 1 week 5 days 13 hours ago) and read 2942 times:
Most all of the US carriers have a "clean aircraft" concept. This means no ice/frost/snow on any surface of the plane. Of course the control surfaces are most critical, however a accumulation of snow or ice on the fuselage will also increase the weight and flying characteristics of the plane. That is why you will see the wings, tail, and fuselage deiced when it is snowing.
Deicing could happen at almost any time when the temperature is below 45F. Frost can form on wings, upper tails, and over fuel tanks at a relatively high temperature. There are certain exceptions for frost. An example would be frost that is above the windows, and only on the fuselage. Most carriers allow this without deicing. As soon as there is any frost on the wings, or tail, the plane will be deiced. Frost will form on a plane with no visible moisture in the air.
Engine inlets are inspected by either the crew or mechanics, and if there is ice build up in the fan blades, (or propellers) ususally maintenance is responsible for removing it prior to departure.
Those guys in the deice trucks freezing their butts off do a great job making sure that every time a plane leaves, it is ready for a safe flight.
Arguing with a pilot is like mudwrestling a pig. After awhile you begin to think the pig likes it.
A340600 From United Kingdom, joined Aug 2003, 4107 posts, RR: 51
Reply 14, posted (10 years 4 months 1 day 12 hours ago) and read 2814 times:
Funny de-icing story. In Salzburg we were the biggest a/c on te ground (763ER) for our short flight bk to LGW. We had to have 2 de-icers, whilst the other a/c (757's) only required one.
Anyway they only sent one out, thinking it could manage. It spent time de-icing the left wing, then moved onto the right. once it had finished the right wing the left one had iced up again! Then they did the left and right one had iced. EVENTUALLY we got another de-icer in.
Anyway I was sat in Y for 2 hours on ground and it hurt. Let alone having to go trans in that thing!
[Edited 2004-12-27 00:47:51]
Despite the name I am a Boeing man through and through!
FinnWings From Finland, joined Oct 2003, 640 posts, RR: 2
Reply 15, posted (10 years 4 months 18 hours ago) and read 2763 times:
Deicing could happen at almost any time when the temperature is below 45F. Frost can form on wings, upper tails, and over fuel tanks at a relatively high temperature.
This is definitely true. De-icing might be needed in any temperature even above 45F. I have once witnessed de-icing at HKG when temperature was 70F! I believe the aircraft had experienced severe icing during descent and the ice didn't melt completely during turnaround.
Starlionblue From Greenland, joined Feb 2004, 17296 posts, RR: 67
Reply 16, posted (10 years 4 months 16 hours ago) and read 2766 times:
It doesn't have to be in the 20's either I have seen some planes de-ice when it has been in the 40's. It all depends if there is ice, frost, etc on the surface of the aircraft.
Very true. On Gotland (island outside Sweden) they brought this guy in with frostbite on the hottest day of the year. His glider had been caught in a thunderstorm. So it can be warm on the ground and very cold up there.
"There are no stupid questions, but there are a lot of inquisitive idiots."