njdevilsin03
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De-Icing

Wed Dec 15, 2004 9:05 am

What are the average conditions for a plane to be de-iced in, mid 20s? Basically whats it have to be to be de-iced?
717, 727, 731, 732, 733, 734, 735, 73G, 738, 752, 753, 762, 763, 777, DC9, MD80, DC10, L1011, ERJ, CRJ, ATR, DH8, A300,
 
AvianceGirlUK
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RE: De-Icing

Wed Dec 15, 2004 9:09 am

'Basically whats it have to be to be de-iced?'

Erm.. Ice on the wings i guess... No sarcastic comment intended but kinda set yourself up for this answer...
 
tnsaf
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RE: De-Icing

Wed Dec 15, 2004 9:49 am

Ice, frost, snow accumulation on the wings and other flying surfaces. As well accumulations of snow etc. from the fuselage.

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cancidas
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RE: De-Icing

Wed Dec 15, 2004 9:53 am

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
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RE: De-Icing

Wed Dec 15, 2004 10:35 am

>>>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...
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
 
njdevilsin03
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RE: De-Icing

Wed Dec 15, 2004 11:21 am

SAy the temp is in the low 20s with light snow would that be considered enough for de icing?
717, 727, 731, 732, 733, 734, 735, 73G, 738, 752, 753, 762, 763, 777, DC9, MD80, DC10, L1011, ERJ, CRJ, ATR, DH8, A300,
 
cylw
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RE: De-Icing

Wed Dec 15, 2004 2:50 pm

Whenever frost, snow or ice is ADHERING to a CRITICAL surface.
Pretty simple eh?
 
njdevilsin03
Posts: 616
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RE: De-Icing

Wed Dec 15, 2004 3:27 pm

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.
717, 727, 731, 732, 733, 734, 735, 73G, 738, 752, 753, 762, 763, 777, DC9, MD80, DC10, L1011, ERJ, CRJ, ATR, DH8, A300,
 
airstatdfw
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RE: De-Icing

Wed Dec 15, 2004 3:45 pm

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.

AirStatDFW
 
njdevilsin03
Posts: 616
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RE: De-Icing

Wed Dec 15, 2004 4:01 pm

thanks for all the info guys!
717, 727, 731, 732, 733, 734, 735, 73G, 738, 752, 753, 762, 763, 777, DC9, MD80, DC10, L1011, ERJ, CRJ, ATR, DH8, A300,
 
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HAWK21M
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RE: De-Icing

Wed Dec 15, 2004 7:02 pm

Critical Flight control surfaces,Wings,Leading Edges.Basicaly anything that could alter the Lift & control surfaces movement by being covered with ice or frozen.
What about Engine rotors.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
air2gxs
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RE: De-Icing

Wed Dec 15, 2004 11:41 pm

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
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RE: De-Icing

Thu Dec 16, 2004 7:06 am

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.

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HAWK21M
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RE: De-Icing

Fri Dec 17, 2004 5:20 pm

What are the Levels of Deicing Fluids available & what determines its use.
Time,Amount of snow,Temperature.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
A340600
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Joined: Sun Aug 24, 2003 10:24 pm

RE: De-Icing

Mon Dec 27, 2004 8:47 am

Hey,

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!

Sam

[Edited 2004-12-27 00:47:51]
Despite the name I am a Boeing man through and through!
 
FinnWings
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RE: De-Icing

Tue Dec 28, 2004 2:28 am

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.

Best Regards,
FinnWings
 
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Starlionblue
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RE: De-Icing

Tue Dec 28, 2004 4:23 am

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.
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