Hangar flying today, one high-time CFII, MEI, etc. expressed concern with
leaving the pitot heat on in warmer weather. Says he wants the heat in clouds
so the pitot doesn't fill up with mist/moisture/water but he turns it off in the
clear for fear of burning it out.

I've never heard or read about either of these issues before. Comments?

On Wed, 29 Dec 2004 00:44:55 GMT, Mitty > wrote:

> Hangar flying today, one high-time CFII, MEI, etc. expressed concern with
> leaving the pitot heat on in warmer weather. Says he wants the heat in clouds
> so the pitot doesn't fill up with mist/moisture/water but he turns it off in the
> clear for fear of burning it out.
>
> I've never heard or read about either of these issues before. Comments?

There should be no concern with burning it out when in flight, irrespective
of the ambient temperature. It should not be turned on on the ground for
longer than needed to check its operation, unless the temperature is near
freezing or below.

Mitty > wrote in
:

> Hangar flying today, one high-time CFII, MEI, etc. expressed concern
> with leaving the pitot heat on in warmer weather. Says he wants the
> heat in clouds so the pitot doesn't fill up with mist/moisture/water
> but he turns it off in the clear for fear of burning it out.
>
> I've never heard or read about either of these issues before.
> Comments?

It's an electric heating element, and has a finite lifetime just like the
heating element in your electric range. Another problem can happen if
you miss the checklist item for turning it off, and someone on the ground
walks up and grabs it. Instant cooked palm. I only use it when
necessary.

--
Regards,

Stan

Mitty,
A few years ago I picked up a C-182 that had been parked in the shade of a
hangar and shielded from the morning sun. What I found out was that there
was frozen moisture in the pitot tube. It had frozen during the night and
had not yet thawed in the morning.

A no-airspeed takeoff is not necessarily a problem but it does remind you
that preflight pitot heat on cool mornings is not a bad
idea.

gene Whitt