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?

--
Transpose mxsmanic and gmail to reach me by e-mail.

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.

In article ,
Mxsmanic wrote:

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?

No, it just wastes resources and puts unnecessary wear and tear on
things.

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

That applies only to boots. If the ice layer is too thin it may remain
adhered to the boot.

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?

Except for boots, the safest policy is to just turn it all on if there's
any possibility of ice.

rg

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

Mxsmanic wrote:
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?

Some ice protection equipment uses a fluid that is of limited quantity
on-board, not to mention that it costs money. Other ice protection
devices can put a drain on a smaller aircraft's power. Turbine drivers
might chime in with their reasons, I don't know them.

Ice protection isn't always needed when it's cold, you also need
moisture to create ice.

"Steve Foley" wrote in news:BRlbh.12790

He can always pause and go to the fridge for more fluids.

Better yet, use the hot water from his sink.

"B A R R Y" wrote in message
et...
Mxsmanic wrote:
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?

Some ice protection equipment uses a fluid that is of limited quantity
on-board, not to mention that it costs money.

He can always pause and go to the fridge for more fluids.

Other ice protection devices can put a drain on a smaller aircraft's
power.

He's running on 220VAC. Sholdn't be an issue.

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

True, cold and in cloud or precip.

BTW, TKS systems make the plane and floor slippery, don't
fall and break a leg.




"B A R R Y" wrote in message
et...
| Mxsmanic wrote:
| 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?
|
| Some ice protection equipment uses a fluid that is of
limited quantity
| on-board, not to mention that it costs money. Other ice
protection
| devices can put a drain on a smaller aircraft's power.
Turbine drivers
| might chime in with their reasons, I don't know them.
|
| Ice protection isn't always needed when it's cold, you
also need
| moisture to create ice.