Icing conditions

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.

"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.

"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.

A Lieberma wrote in
. 18:

"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.


Or pee.

Maybe he can rig a 200 pound CO2 bottle that can blast him,
simulating flight into a CB at the freezing level.




"Steve Foley" wrote in message
news:BRlbh.12790$d42.8443@trndny07...
| "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.
|
|

Jim Macklin wrote:
Maybe he can rig a 200 pound CO2 bottle that can blast him,
simulating flight into a CB at the freezing level.

And end up looking like Dr. Evil's cat? G

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.

B A R R Y writes:

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

But without a measurement of humidity on board, how do you know if
there's moisture out there (apart from the obvious case of visible
clouds or fog)?

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

This is where training and experience start to play a part in flight
planning...

If the temperature spread between the air temperature and the "dew"
point get close (like only 3 deg difference) the possibility of the
moisture in the air causing ice at or close to freezing temps becomes
a factor. In air pilot reports (PIREPS) are useful as well. This
information is obtained when you look at the weather forcast for your
intended route, and get a weather briefing from the weather people
before flight.

We have had several days of this here, temps +3 on the ground,- 5 at
alt, dew point -1 on the ground.

Last weekend we had this, and a PIREP from a Dash 8 reporting
moderate Rime Ice decending thriugh 6000 2 hrs earlier...

Ugh!

Dave




On Wed, 29 Nov 2006 23:05:23 +0100, Mxsmanic
wrote:

B A R R Y writes:

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

But without a measurement of humidity on board, how do you know if
there's moisture out there (apart from the obvious case of visible
clouds or fog)?

"Mxsmanic" wrote in message
...

crap snipped...

It's been my experience that any aircraft once exposed to ice, will
naturally seek out warmer air below.

Al G