Icing conditions

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

No argument on that!

Dave



On Thu, 30 Nov 2006 08:31:16 -0800, "Al G"
wrote:


"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