is it true that every pilot has to use the anti-ice buttons during climbing?

Question

i mean when you are passing clouds while you climb, and the temperatures are from 0 up to -15°C (in this temperatures the icing is a real threat), you need to enable the anti-ices, because you will always (or almost) pass the clouds while climbing and the temperatures will often be in these levels mentioned above.

Answer 1

Here is what the FAA says for part 121 operations:
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Icing conditions exist when the OAT on the ground and for takeoff, or TAT in flight, is 10°C (50°F) or below and visible moisture in any form is present (such as clouds, fog/mist with visibility of one mile or less, rain, snow, sleet, and ice crystals).
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John M: Engine anti-ice should be on when you encounter icing conditions and it has zero to to with the time of the year, global location, or climb angle.

Wing anti-ice should be used according to your company or manufacturer's recommendation as some systems are de-ice only while others are anti-ice and de-ice.
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Mark is absolutely correct that many airplanes do not have anti-ice. What he failed to tell you is that competent pilots operating those airplanes to not fly them in icing conditions.
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Michael in Norway: In order for ice to accumulate the visible moisture must be in a liquid form. If the airframe is colder than the OAT (supercooled from altitude from the last leg, for example) it may be possible that the visible moisture would freeze on contact with the airframe even at temps slightly higher than freezing. I always thought it a bit odd that after a 2 hour flight at 35,000 feet the fuel would be super cooled and the hot, damp air of south Florida would freeze to the underside of the wing by the fuel tanks. 80 degrees outside and I have hoar frost on the wings around the fuel tanks!

Then, of course, air cools as it enters the venturi of the airfoil and engine inlets. These are a few reasons the FAA considers temperatures above freezing as icing conditions.

Answer 2

eh, this is really most critical for the engines, and it really depends on the model. Many manufacturers say that anti-ice must be operated for at least a few minutes prior to entering icing conditions. It's all about liability these days. The last thing they want is a chunk of ice breaking off the nacelle and chipping blades or worse.

Most manufacturers publish newsletters each quarter or so that describes problems in the field and reviews/changes operating procedures if necessary.

So the technical answer is yes, but practically speaking most pilots take all of the conditions into consideration. It never hurts to heat the inlets up.

EDIT - Tarkill, on the aircraft I fly the manufacturer has defined icing conditions that are more restrictive than the regulations.

Answer 3

An interesting point is that the tiny droplets of water that make the clouds/fog/haze can be cooled down to -40°C before they freeze. That is because their mass is so little that they need something to release the energy needed to go from liquid to solid. A grain of dust and bam! The leading edge of your aircraft and bam!

I don't understand the FAA talking about 10°C or below. Here, in Norway, we watch the 0-isotherm altitude to stay under it when we fly without de-icing device.
Carburettor icing is another thing, though. I expect all aircaft with carburettor have a way to heat the incoming air.

Answer 4

suitable she did not get that and what she have been given grew to grow to be way too a lot, she only needed adequate to boost her daughter (god help the undesirable teen, the placement are social centers eh?) in a ideal and solid way. she might have economic stability yet not emotional with a self obsessed psychopathic trollop for a mom! i will not help thinking if she drugged Paul into featuring. She is one bitter, sick and twisted bunny!

Answer 5

no I disagree with you.

You have to take time of flight, season of the year, location on the globe and speed of rate of climb. Angle of climb is also to be used. This is just the start of my list, should I go on?

Answer 6

No. Plenty of planes don't have anti-ice.

Answer 7

it depends on the time of year