Is a cracked vent SCAT tube an urgent problem?

Ben Jackson wrote:

I found the SCAT tube between the muffler shroud and the defrost vent
in the glareshield has some cracks (you can only see them if you flex
the tube a certain way, which is why they've been missed).

Does this present a carbon monoxide danger?

No.


It's not the heat exchanger
that's cracked, only the tube that carries the warm air to the cabin.
I plan to get it replaced soon but I need to know if I should ground the
plane in the meantime.

No.

Hi Ben.

I have noted a number of replies saying yes and no to your question.
Unfortunately I cannot comment with authority on the 172's system, but on
CT-4s small pinprick size holes in both the heated and cool air scatting
were normally found to be the cause of higher than allowable levels of
carbon monoxide in the cockpit on post maintenance ground runs.

I tend to be wary with these matters. You can't just pull over to the side
of the road for some fresh air if you start feeling tired. :-)

Darryl Gibbs.


"Ben Jackson" wrote in message
et...
I found the SCAT tube between the muffler shroud and the defrost vent
in the glareshield has some cracks (you can only see them if you flex
the tube a certain way, which is why they've been missed).

Does this present a carbon monoxide danger? It's not the heat exchanger
that's cracked, only the tube that carries the warm air to the cabin.
I plan to get it replaced soon but I need to know if I should ground the
plane in the meantime.

--
Ben Jackson

http://www.ben.com/

Thank You, Thank You, Thank You. Now if you can have the pope verify
your post, maybe some of the readers here will believe it.

DON'T MONKEY AROUND WITH EXHAUST GASSES, that includes anything that
may be lingering around the engine compartment.

On Fri, 19 Sep 2003 05:09:29 GMT, "Darryl Gibbs"
wrote:

Hi Ben.

I have noted a number of replies saying yes and no to your question.
Unfortunately I cannot comment with authority on the 172's system, but on
CT-4s small pinprick size holes in both the heated and cool air scatting
were normally found to be the cause of higher than allowable levels of
carbon monoxide in the cockpit on post maintenance ground runs.

I tend to be wary with these matters. You can't just pull over to the side
of the road for some fresh air if you start feeling tired. :-)

Darryl Gibbs.


"Ben Jackson" wrote in message
. net...
I found the SCAT tube between the muffler shroud and the defrost vent
in the glareshield has some cracks (you can only see them if you flex
the tube a certain way, which is why they've been missed).

Does this present a carbon monoxide danger? It's not the heat exchanger
that's cracked, only the tube that carries the warm air to the cabin.
I plan to get it replaced soon but I need to know if I should ground the
plane in the meantime.

--
Ben Jackson

http://www.ben.com/

Darryl Gibbs wrote:

I tend to be wary with these matters. You can't just pull over to the side
of the road for some fresh air if you start feeling tired. :-)

In a Cessna you can. It's called opening the window. I could probably
route the exhaust pipe into the cabin and not get sick. Four vents and
the opening window oughta take care of it.

"Newps" wrote:
Four vents

Five

I'm just curious, coming in rather late to this discussion...

How many answers came from those who do this sort of stuff for a living...with
the right initials behind their name?

How many came from those who have no direct knowledge other than hearsay or
supposition?

Jim



Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com

Jim Weir wrote:

I'm just curious, coming in rather late to this discussion...

How many answers came from those who do this sort of stuff for a living...with
the right initials behind their name?

How many came from those who have no direct knowledge other than hearsay or
supposition?

I'm afraid the initials after my name aren't the ones you're talking about, so I
guess that puts me in the "hearsay or supposition" camp. Was I wrong?

Russell "almost always willing to learn" Kent

initials here, along with common sense.

On Fri, 19 Sep 2003 13:03:54 -0700, Jim Weir wrote:


I'm just curious, coming in rather late to this discussion...

How many answers came from those who do this sort of stuff for a living...with
the right initials behind their name?

How many came from those who have no direct knowledge other than hearsay or
supposition?

Jim



Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com

On Fri, 19 Sep 2003, Jim Weir wrote:


I'm just curious, coming in rather late to this discussion...

How many answers came from those who do this sort of stuff for a living...with
the right initials behind their name?

How many came from those who have no direct knowledge other than hearsay or
supposition?


The guy that works on my plane is an IA with about 20 years
experience and I'm a complete idiot with regard to this stuff. He has no better idea
than I do whether or not the air flows into or out of the hole in the
hose. He's never mesured the pressure inside a cowling in flight. I say
just replace the hose because it's cheap and you don't really know.


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