Icing conditions

From what I understand, icing protection should be turned on if the
outside temperature is 5° C or less. However, what is the reason for
not having it on all the time? Does it overheat in normal weather, or
what?

I read that turning on icing protection before "sufficient ice has
accumulated" may prevent the protection from working to remove the
ice. Why?

Also, what types of anti-icing stuff should I turn on? Just
everything that deals with ice (wing, prop, pitot, fuel vent, etc.),
or is there an accepted order or hierarchy for these things?

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Mxsmanic wrote:
From what I understand, icing protection should be turned on if the
outside temperature is 5° C or less.

Also, what types of anti-icing stuff should I turn on?

Just turn up the heat in the room where you run your simulator, and
you'll be fine.

Air temperature changes with air pressure changes inside
engines and also around the wing and tail surfaces. Also,
temperature probes are not 100% accurate, so the +5°CF is to
provide a cushion.

Exactly what is turned ON depends on the airplane and the
type of ice protection installed.

It is important, something as simple as a temperature probe
also needs to be anti-iced to prevent any ice accumulation.
Other systems do de-icing, allowing some ice build-up and
then removing that.

King Air using P&W PT6 engines have ice deflector vanes that
deflect water and ice particles from the air going into the
engine. The intake lip on older King Airs had an electric
heating element, newer designs are heated by engine exhaust
being routed through a hot lip which gets hot any time the
engine is running.

Jet engines produce a lot of hot air by compression inside
the engine before the combustion section. Some of that hot
air is bled away and used to heat the air inlet to the
engine, electricity may be used to heat temperature probes
in the inlet. Smaller engines don't have as much hot bleed
air available, so they may use bleed air only for the air
intake and cabin pressure/environmental while a big airliner
probably uses bleed air for engines, wings, tail and other
areas. Some airplanes with multi-disc brakes may use a hot
air distribution manifold to send hot air to the brake
assembly so that the brakes are not frozen, this is turned
on a few minutes before landing and during taxiing in water
and slush/snow and is usually on a timer so it turns off
automatically about 10 minutes after gear retraction [the
switch then needs to be manual turned off to reset the
system for landing].

Pitot and windshield heat, are OK to run all the time in
flight, but if pitot heat is used on the ground for a long
period, the chrome will turn a pretty purple, so test it on
the ground [don't burn your hand] and then turn it on before
take-off.

Too many systems to explain here, read the POH or a good
training manual.




"Gary" wrote in message
oups.com...

Mxsmanic wrote:
From what I understand, icing protection should be turned
on if the
outside temperature is 5° C or less.

Also, what types of anti-icing stuff should I turn on?

Just turn up the heat in the room where you run your
simulator, and
you'll be fine.

"Jim Macklin" wrote in
:

Too many systems to explain here, read the POH or a good
training manual.

Talk about wasted advise.....

Mx doesn't even read the replies, much less anything he's been shown to
read like references or POHs.

Allen

I know, I know, but there are other real students out there
who might benefit. Just think if the Air Florida 737 pilot
had turned his engine anti-ice on before take-off a
Washington National, CNN wouldn't have had all those videos
of the water rescues and dead people.



"A Lieberma" wrote in message
. 18...
| "Jim Macklin" wrote
in
| :
|
| Too many systems to explain here, read the POH or a good
| training manual.
|
| Talk about wasted advise.....
|
| Mx doesn't even read the replies, much less anything he's
been shown to
| read like references or POHs.
|
| Allen

I am not sure why you guys are beating up the guy. He may not be a real
pilot, but I have not found his questions to be offensive, off-topic or
even ignorant. To the contrary, he has posed several questions in the
past that many of us were unable to answer, or revealed lack of
knowledge on our part. In those cases, it is the real pilots who I have
seen to misbehave. I can't recall Mxsmanic to have lost his cool
despite all the things that poeple call him.


A Lieberma wrote:
"Jim Macklin" wrote in
:

Too many systems to explain here, read the POH or a good
training manual.

Talk about wasted advise.....

Mx doesn't even read the replies, much less anything he's been shown to
read like references or POHs.

Allen

"Andrew Sarangan" wrote in message
oups.com...
I am not sure why you guys are beating up the guy. He may not be a real
pilot, but I have not found his questions to be offensive, off-topic or
even ignorant. To the contrary, he has posed several questions in the
past that many of us were unable to answer, or revealed lack of
knowledge on our part. In those cases, it is the real pilots who I have
seen to misbehave. I can't recall Mxsmanic to have lost his cool
despite all the things that poeple call him.

It's not his questions that we have a problem with. It his responses to the
answers he receives.

Andrew Sarangan schrieb:

I am not sure why you guys are beating up the guy.

It's called the lemmings syndrome. It feels good to be part of a crowd,
it warms the soul to pat on each other's shoulders and last but not leat
it gives a sweet feeling to beat and kick an outsider, especially as
part of a group. Now if you can get all those positive feelings with a
single short post, then Usenet saves you a lot on psychiatrist fees.

Stefan

I have to agree Andrew..

I am convinced thatr somewhere behind "Mxmaniac" must be a tolerant
gentleman...

I "tolerated" a lot of questions from a guy about 6 months ago. He
was flying a sim... And the questions would fall into the "stupid"
category within some opinions here...

So I showed him around our Warrior, let him sit in the left seat...
(1st time in a light plane). He recognised all the instruments,
controls and functions...

I saw him at the airport 3 months later..

He had signed up for pilot training and was working on landings ( at
about 6 hrs).....

So I will take a chance on another who may become a "real" pilot
someday...if they show an interest in aviation...

OK, maybe I just have a thick skin, or I just don't take myself very
seriously...

If anybody offends me, I just ignore them....they fade away after a
while... Mx has not offended me...

And I am NOT going to impress my opinion on others. I am not going to
encourage others to respond to him, and I must confess I am beginning
to tire of others (more than) suggesting that I (we) NOT respond to
him.

If anyone in this group offends me, I will determine it was not a
misunderstanding, make them aware, and move on. I feel no need to
blacklist anyone.

It was 30 some years ago when I was pumping "stupid" questions to a
pilot.. I am glad he was patient and encouraged me to keep
dreaming. But it was still some time before I could afford to train
to become a "real" pilot.

Cheers!

Dave




, I just move on On 29 Nov 2006 13:39:38 -0800, "Andrew Sarangan"
wrote:

I am not sure why you guys are beating up the guy. He may not be a real
pilot, but I have not found his questions to be offensive, off-topic or
even ignorant. To the contrary, he has posed several questions in the
past that many of us were unable to answer, or revealed lack of
knowledge on our part. In those cases, it is the real pilots who I have
seen to misbehave. I can't recall Mxsmanic to have lost his cool
despite all the things that poeple call him.


A Lieberma wrote:
"Jim Macklin" wrote in
:

Too many systems to explain here, read the POH or a good
training manual.

Talk about wasted advise.....

Mx doesn't even read the replies, much less anything he's been shown to
read like references or POHs.

Allen

"Jim Macklin" writes:

Exactly what is turned ON depends on the airplane and the
type of ice protection installed.

In the Baron (simulated), I have Pitot Heat, Fuel Vent Heat, Stall
Warn Heat, Prop, Windshield, and Surface. I can figure out what they
all do except "Surface" (leading edge heat or something?), but I'm not
sure which ones can be left on under what conditions.

The manual only mentions "Ice Protection Systems - as required" in a
checklist, but does not explain what they are for (the sim manual is
presumably more limited than the real one, although some portions are
taken directly out of the real one).

I've only experienced icing once in the sim, when the pitot tube froze
up. I haven't really figured out how to configure the sim to
guarantee that I have ice. It's on my list of things to practice.

Pitot and windshield heat, are OK to run all the time in
flight, but if pitot heat is used on the ground for a long
period, the chrome will turn a pretty purple, so test it on
the ground [don't burn your hand] and then turn it on before
take-off.

Is there a thermostat or something in ice protection hardware to keep
it from overheating if it isn't really that cold outside?

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