Author: "Brian" <bsowell@...> Time: Fri Dec 24, 2004 6:57 am PST Link
My airspeed indicator that I bought from van's about 6 months ago is
installed in my panel, but doesn't have pitot or static lines
connected to it (still building) - the red plugs in the back had
never been out until today.
Last night, it got down to about 20 degrees F. or maybe a touch
colder. The first hard freeze of the year in TX. Now my airspeed
indicator reads 110 knots. The little red plugs have holes drilled
in them from the factory. Even so, I removed them and no change.
It seems getting cold damaged it. Is that normal??
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Author: "Richard & Roberta Hegy" <rhegy@...> Time: Fri Dec 24, 2004 7:50 pm PST Link
Getting cold should not damage the ASI. Call Van's. I'm sure they will replace it. Sounds defective. My ASI got down to about 5 deg F last night in the hangar and it is OK. It is in a completed AC.
Roberta
----- Original Message -----
From: Brian
To: vansairforce@yahoogroups.com
Sent: Thursday, December 23, 2004 6:27 PM
Subject: [VAF Mailing List] Airspeed indicator damaged by the cold?
My airspeed indicator that I bought from van's about 6 months ago is
installed in my panel, but doesn't have pitot or static lines
connected to it (still building) - the red plugs in the back had
never been out until today.
Last night, it got down to about 20 degrees F. or maybe a touch
colder. The first hard freeze of the year in TX. Now my airspeed
indicator reads 110 knots. The little red plugs have holes drilled
in them from the factory. Even so, I removed them and no change.
It seems getting cold damaged it. Is that normal??
Online help on this group at:
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Author: "Phil" <wanderer@...> Time: Fri Dec 24, 2004 11:40 pm PST Link
Brian
Cold shouldn't damage an ASI, or any other instrument for that
matter. My Cessna sees -40F every year, and gets flown down to -10F
with no damage.
Phil
--- In vansairforce@yahoogroups.com, "Brian" <bsowell@d...> wrote:
> My airspeed indicator that I bought from van's about 6 months ago
is
> installed in my panel, but doesn't have pitot or static lines
> connected to it (still building) - the red plugs in the back had
> never been out until today.
>
> Last night, it got down to about 20 degrees F. or maybe a touch
> colder. The first hard freeze of the year in TX. Now my airspeed
> indicator reads 110 knots. The little red plugs have holes
drilled
> in them from the factory. Even so, I removed them and no change.
>
> It seems getting cold damaged it. Is that normal??
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Author: Gary Zilik <zilik@...> Time: Sat Dec 25, 2004 10:17 am PST Link
I agree that the cold should not harm it. It may get sluggish but should
do Ok Mine has seen -20 and worked just fine. Of course mine is made by
United Instruments. (USA)
Gary
Richard & Roberta Hegy wrote:
> Getting cold should not damage the ASI. Call Van's. I'm sure they will
> replace it. Sounds defective. My ASI got down to about 5 deg F last
> night in the hangar and it is OK. It is in a completed AC.
>
> Roberta
> ----- Original Message -----
> From: Brian
> To: vansairforce@yahoogroups.com
> Sent: Thursday, December 23, 2004 6:27 PM
> Subject: [VAF Mailing List] Airspeed indicator damaged by the cold?
> My airspeed indicator that I bought from van's about 6 months ago is
> installed in my panel, but doesn't have pitot or static lines
> connected to it (still building) - the red plugs in the back had
> never been out until today.
>
> Last night, it got down to about 20 degrees F. or maybe a touch
> colder. The first hard freeze of the year in TX. Now my airspeed
> indicator reads 110 knots. The little red plugs have holes drilled
> in them from the factory. Even so, I removed them and no change.
>
> It seems getting cold damaged it. Is that normal??
> Online help on this group at:
> http://help.yahoo.com/help/groups/
> Yahoo! Groups Sponsor
>
> Get unlimited calls to
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Author: "Bill Swaim" <bill@...> Time: Mon Dec 27, 2004 7:44 am PST Link
There is a slight possibility that there was some water present in the
instrument, but only you will know that. If the storage area temperature
was warm with a normal relative humidity (35-50%) just prior to the freeze,
water vapor (gas) trapped in the ASI would have condensed to water on the
below dewpoint parts and then frozen. Kind of a gas to liquid to solid
scenario. It has happened in the past here (not aviation related), but it
is rare, since the temps & RH in Iowa usually slide down prior to a
temperature plummet. PS, 20 is not really cold, but I guess it is all
relative.
Bill Swaim
-----Original Message-----
From: Brian [mailto:bsowell@digitex.net]
Sent: Thursday, December 23, 2004 6:27 PM
To: vansairforce@yahoogroups.com
Subject: [VAF Mailing List] Airspeed indicator damaged by the cold?
My airspeed indicator that I bought from van's about 6 months ago is
installed in my panel, but doesn't have pitot or static lines connected to
it (still building) - the red plugs in the back had never been out until
today.
Last night, it got down to about 20 degrees F. or maybe a touch colder. The
first hard freeze of the year in TX. Now my airspeed indicator reads 110
knots. The little red plugs have holes drilled in them from the factory.
Even so, I removed them and no change.
It seems getting cold damaged it. Is that normal??
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Author: "Brian" <bsowell@...> Time: Tue Dec 28, 2004 4:05 am PST Link
Well, that could be what happened. It north Texas, it goes from one
extreme to the other in hours. It was warm just before the 3 day
freeze, and today it was in the 60's again. But now even after the
cold, it reads somewhere between 50 and 110 knots for no reason at
all...more the colder it gets. Obviously its broken now regardless.
And 20 degrees is dang cold for me.
--- In vansairforce@yahoogroups.com, "Bill Swaim" <bill@m...> wrote:
>
> There is a slight possibility that there was some water present in
the
> instrument, but only you will know that. If the storage area
temperature
> was warm with a normal relative humidity (35-50%) just prior to
the freeze,
> water vapor (gas) trapped in the ASI would have condensed to water
on the
> below dewpoint parts and then frozen. Kind of a gas to liquid to
solid
> scenario. It has happened in the past here (not aviation
related), but it
> is rare, since the temps & RH in Iowa usually slide down prior to a
> temperature plummet. PS, 20 is not really cold, but I guess it is
all
> relative.
>
> Bill Swaim
>
> -----Original Message-----
> From: Brian [mailto:bsowell@d...]
> Sent: Thursday, December 23, 2004 6:27 PM
> To: vansairforce@yahoogroups.com
> Subject: [VAF Mailing List] Airspeed indicator damaged by the cold?
> My airspeed indicator that I bought from van's about 6 months ago
is
> installed in my panel, but doesn't have pitot or static lines
connected to
> it (still building) - the red plugs in the back had never been out
until
> today.
>
> Last night, it got down to about 20 degrees F. or maybe a touch
colder. The
> first hard freeze of the year in TX. Now my airspeed indicator
reads 110
> knots. The little red plugs have holes drilled in them from the
factory.
> Even so, I removed them and no change.
>
> It seems getting cold damaged it. Is that normal??
> ------------------------ Yahoo! Groups Sponsor --------------------
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> a clean sweep of pop-up ads. Yahoo! Companion Toolbar.
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Author: "Bill Swaim" <bill@...> Time: Tue Dec 28, 2004 5:26 am PST Link
The plugs would have allowed the moisture level inside the instrument to
equalize with the outside, but as the temp & moisture level quickly dropped
around it, the inside of the gauge was still at higher levels & it rained
inside.....then froze. If it froze in the wrong place its toast, but needs
to be inspected.
Just a guess
-----Original Message-----
From: Brian [mailto:bsowell@digitex.net]
Sent: Monday, December 27, 2004 10:42 PM
To: vansairforce@yahoogroups.com
Subject: Re: [VAF Mailing List] Airspeed indicator damaged by the cold?
Well, that could be what happened. It north Texas, it goes from one extreme
to the other in hours. It was warm just before the 3 day freeze, and today
it was in the 60's again. But now even after the cold, it reads somewhere
between 50 and 110 knots for no reason at all...more the colder it gets.
Obviously its broken now regardless.
And 20 degrees is dang cold for me.
--- In vansairforce@yahoogroups.com, "Bill Swaim" <bill@m...> wrote:
>
> There is a slight possibility that there was some water present in
the
> instrument, but only you will know that. If the storage area
temperature
> was warm with a normal relative humidity (35-50%) just prior to
the freeze,
> water vapor (gas) trapped in the ASI would have condensed to water
on the
> below dewpoint parts and then frozen. Kind of a gas to liquid to
solid
> scenario. It has happened in the past here (not aviation
related), but it
> is rare, since the temps & RH in Iowa usually slide down prior to a
> temperature plummet. PS, 20 is not really cold, but I guess it is
all
> relative.
>
> Bill Swaim
>
> -----Original Message-----
> From: Brian [mailto:bsowell@d...]
> Sent: Thursday, December 23, 2004 6:27 PM
> To: vansairforce@yahoogroups.com
> Subject: [VAF Mailing List] Airspeed indicator damaged by the cold?
> My airspeed indicator that I bought from van's about 6 months ago
is
> installed in my panel, but doesn't have pitot or static lines
connected to
> it (still building) - the red plugs in the back had never been out
until
> today.
>
> Last night, it got down to about 20 degrees F. or maybe a touch
colder. The
> first hard freeze of the year in TX. Now my airspeed indicator
reads 110
> knots. The little red plugs have holes drilled in them from the
factory.
> Even so, I removed them and no change.
>
> It seems getting cold damaged it. Is that normal??
> ------------------------ Yahoo! Groups Sponsor --------------------
~--> Make
> a clean sweep of pop-up ads. Yahoo! Companion Toolbar.
> Now with Pop-Up Blocker. Get it for free!
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-~->
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Author: Danny Lawhon <dlawhon@...> Time: Tue Dec 28, 2004 7:01 am PST Link
I live in south texas and yes, sometimes the air
conditioning is running for weeks (nov Dec and Jan)
and then the next day its full on heater.. hell we got
snow for Christmas, 1st time in 100 years.. so the ai
should be able to handle those type of extrems some
planes are stored outside all the time here.. the
pitto static system is full open to the atmosphere
most of the time, except maybe a boot over the tube
but thats not sealed from humitidity anyway.. sounds
like the ai was bad to start with to me.. get a
replacement they should honor it...
Danny..
--- Brian <bsowell@digitex.net> wrote:
> Well, that could be what happened. It north Texas,
> it goes from one
> extreme to the other in hours. It was warm just
> before the 3 day
> freeze, and today it was in the 60's again. But now
> even after the
> cold, it reads somewhere between 50 and 110 knots
> for no reason at
> all...more the colder it gets. Obviously its broken
> now regardless.
>
> And 20 degrees is dang cold for me.
>
> --- In vansairforce@yahoogroups.com, "Bill Swaim"
> <bill@m...> wrote:
> >
> > There is a slight possibility that there was some
> water present in
> the
> > instrument, but only you will know that. If the
> storage area
> temperature
> > was warm with a normal relative humidity (35-50%)
> just prior to
> the freeze,
> > water vapor (gas) trapped in the ASI would have
> condensed to water
> on the
> > below dewpoint parts and then frozen. Kind of a
> gas to liquid to
> solid
> > scenario. It has happened in the past here (not
> aviation
> related), but it
> > is rare, since the temps & RH in Iowa usually
> slide down prior to a
> > temperature plummet. PS, 20 is not really cold,
> but I guess it is
> all
> > relative.
> >
> > Bill Swaim
> >
> > -----Original Message-----
> > From: Brian [mailto:bsowell@d...]
> > Sent: Thursday, December 23, 2004 6:27 PM
> > To: vansairforce@yahoogroups.com
> > Subject: [VAF Mailing List] Airspeed indicator
> damaged by the cold?
> > My airspeed indicator that I bought from van's
> about 6 months ago
> is
> > installed in my panel, but doesn't have pitot or
> static lines
> connected to
> > it (still building) - the red plugs in the back
> had never been out
> until
> > today.
> >
> > Last night, it got down to about 20 degrees F. or
> maybe a touch
> colder. The
> > first hard freeze of the year in TX. Now my
> airspeed indicator
> reads 110
> > knots. The little red plugs have holes drilled in
> them from the
> factory.
> > Even so, I removed them and no change.
> >
> > It seems getting cold damaged it. Is that
> normal??
> > ------------------------ Yahoo! Groups Sponsor
> --------------------
> ~--> Make
> > a clean sweep of pop-up ads. Yahoo! Companion
> Toolbar.
> > Now with Pop-Up Blocker. Get it for free!
http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/1yWplB/TM
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Author: "Brian" <bsowell@...> Time: Tue Dec 28, 2004 6:23 pm PST Link
Ok, I found the problem with the airspeed indicator. I pulled it
off to ship back, pulled out the red plug from the static port again
to have a look, and the hole into the instrument was glued shut with
some clear glue! A manufacturing defect for sure. When the
instument got cold, the pressure in the static area dropped because
the air couldn't flow in, and viola, 120 knots.
--- In vansairforce@yahoogroups.com, Danny Lawhon <dlawhon@y...>
wrote:
>
> I live in south texas and yes, sometimes the air
> conditioning is running for weeks (nov Dec and Jan)
> and then the next day its full on heater.. hell we got
> snow for Christmas, 1st time in 100 years.. so the ai
> should be able to handle those type of extrems some
> planes are stored outside all the time here.. the
> pitto static system is full open to the atmosphere
> most of the time, except maybe a boot over the tube
> but thats not sealed from humitidity anyway.. sounds
> like the ai was bad to start with to me.. get a
> replacement they should honor it...
>
> Danny..
> --- Brian <bsowell@d...> wrote:
> > Well, that could be what happened. It north Texas,
> > it goes from one
> > extreme to the other in hours. It was warm just
> > before the 3 day
> > freeze, and today it was in the 60's again. But now
> > even after the
> > cold, it reads somewhere between 50 and 110 knots
> > for no reason at
> > all...more the colder it gets. Obviously its broken
> > now regardless.
> >
> > And 20 degrees is dang cold for me.
> >
> > --- In vansairforce@yahoogroups.com, "Bill Swaim"
> > <bill@m...> wrote:
> > >
> > > There is a slight possibility that there was some
> > water present in
> > the
> > > instrument, but only you will know that. If the
> > storage area
> > temperature
> > > was warm with a normal relative humidity (35-50%)
> > just prior to
> > the freeze,
> > > water vapor (gas) trapped in the ASI would have
> > condensed to water
> > on the
> > > below dewpoint parts and then frozen. Kind of a
> > gas to liquid to
> > solid
> > > scenario. It has happened in the past here (not
> > aviation
> > related), but it
> > > is rare, since the temps & RH in Iowa usually
> > slide down prior to a
> > > temperature plummet. PS, 20 is not really cold,
> > but I guess it is
> > all
> > > relative.
> > >
> > > Bill Swaim
> > >
> > > -----Original Message-----
> > > From: Brian [mailto:bsowell@d...]
> > > Sent: Thursday, December 23, 2004 6:27 PM
> > > To: vansairforce@yahoogroups.com
> > > Subject: [VAF Mailing List] Airspeed indicator
> > damaged by the cold?
> > > My airspeed indicator that I bought from van's
> > about 6 months ago
> > is
> > > installed in my panel, but doesn't have pitot or
> > static lines
> > connected to
> > > it (still building) - the red plugs in the back
> > had never been out
> > until
> > > today.
> > >
> > > Last night, it got down to about 20 degrees F. or
> > maybe a touch
> > colder. The
> > > first hard freeze of the year in TX. Now my
> > airspeed indicator
> > reads 110
> > > knots. The little red plugs have holes drilled in
> > them from the
> > factory.
> > > Even so, I removed them and no change.
> > >
> > > It seems getting cold damaged it. Is that
> > normal??
> > > ------------------------ Yahoo! Groups Sponsor
> > --------------------
> > ~--> Make
> > > a clean sweep of pop-up ads. Yahoo! Companion
> > Toolbar.
> > > Now with Pop-Up Blocker. Get it for free!
> http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/1yWplB/TM
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Author: "steve zicree" <szicree@...> Time: Tue Dec 28, 2004 7:51 pm PST Link
Dang!! Do they not test these things AT ALL before they send em out? Any test would have immediately detected such a problem. Incidently, if you poke a hole in the glue does the gauge go to zero? Glad you found the problem and shared the info.
Steve Zicree
----- Original Message -----
From: Brian
To: vansairforce@yahoogroups.com
Sent: Tuesday, December 28, 2004 6:02 PM
Subject: Re: [VAF Mailing List] Airspeed indicator damaged by the cold?
Ok, I found the problem with the airspeed indicator. I pulled it
off to ship back, pulled out the red plug from the static port again
to have a look, and the hole into the instrument was glued shut with
some clear glue! A manufacturing defect for sure. When the
instument got cold, the pressure in the static area dropped because
the air couldn't flow in, and viola, 120 knots.
--- In vansairforce@yahoogroups.com, Danny Lawhon <dlawhon@y...>
wrote:
>
> I live in south texas and yes, sometimes the air
> conditioning is running for weeks (nov Dec and Jan)
> and then the next day its full on heater.. hell we got
> snow for Christmas, 1st time in 100 years.. so the ai
> should be able to handle those type of extrems some
> planes are stored outside all the time here.. the
> pitto static system is full open to the atmosphere
> most of the time, except maybe a boot over the tube
> but thats not sealed from humitidity anyway.. sounds
> like the ai was bad to start with to me.. get a
> replacement they should honor it...
>
> Danny..
> --- Brian <bsowell@d...> wrote:
> > Well, that could be what happened. It north Texas,
> > it goes from one
> > extreme to the other in hours. It was warm just
> > before the 3 day
> > freeze, and today it was in the 60's again. But now
> > even after the
> > cold, it reads somewhere between 50 and 110 knots
> > for no reason at
> > all...more the colder it gets. Obviously its broken
> > now regardless.
> >
> > And 20 degrees is dang cold for me.
> >
> > --- In vansairforce@yahoogroups.com, "Bill Swaim"
> > <bill@m...> wrote:
> > >
> > > There is a slight possibility that there was some
> > water present in
> > the
> > > instrument, but only you will know that. If the
> > storage area
> > temperature
> > > was warm with a normal relative humidity (35-50%)
> > just prior to
> > the freeze,
> > > water vapor (gas) trapped in the ASI would have
> > condensed to water
> > on the
> > > below dewpoint parts and then frozen. Kind of a
> > gas to liquid to
> > solid
> > > scenario. It has happened in the past here (not
> > aviation
> > related), but it
> > > is rare, since the temps & RH in Iowa usually
> > slide down prior to a
> > > temperature plummet. PS, 20 is not really cold,
> > but I guess it is
> > all
> > > relative.
> > >
> > > Bill Swaim
> > >
> > > -----Original Message-----
> > > From: Brian [mailto:bsowell@d...]
> > > Sent: Thursday, December 23, 2004 6:27 PM
> > > To: vansairforce@yahoogroups.com
> > > Subject: [VAF Mailing List] Airspeed indicator
> > damaged by the cold?
> > > My airspeed indicator that I bought from van's
> > about 6 months ago
> > is
> > > installed in my panel, but doesn't have pitot or
> > static lines
> > connected to
> > > it (still building) - the red plugs in the back
> > had never been out
> > until
> > > today.
> > >
> > > Last night, it got down to about 20 degrees F. or
> > maybe a touch
> > colder. The
> > > first hard freeze of the year in TX. Now my
> > airspeed indicator
> > reads 110
> > > knots. The little red plugs have holes drilled in
> > them from the
> > factory.
> > > Even so, I removed them and no change.
> > >
> > > It seems getting cold damaged it. Is that
> > normal??
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Author: "steve zicree" <szicree@...> Time: Tue Dec 28, 2004 7:51 pm PST Link
Dang!! Do they not test these things AT ALL before they send em out? Any test would have immediately detected such a problem. Incidently, if you poke a hole in the glue does the gauge go to zero? Glad you found the problem and shared the info.
Steve Zicree
----- Original Message -----
From: Brian
To: vansairforce@yahoogroups.com
Sent: Tuesday, December 28, 2004 6:02 PM
Subject: Re: [VAF Mailing List] Airspeed indicator damaged by the cold?
Ok, I found the problem with the airspeed indicator. I pulled it
off to ship back, pulled out the red plug from the static port again
to have a look, and the hole into the instrument was glued shut with
some clear glue! A manufacturing defect for sure. When the
instument got cold, the pressure in the static area dropped because
the air couldn't flow in, and viola, 120 knots.
--- In vansairforce@yahoogroups.com, Danny Lawhon <dlawhon@y...>
wrote:
>
> I live in south texas and yes, sometimes the air
> conditioning is running for weeks (nov Dec and Jan)
> and then the next day its full on heater.. hell we got
> snow for Christmas, 1st time in 100 years.. so the ai
> should be able to handle those type of extrems some
> planes are stored outside all the time here.. the
> pitto static system is full open to the atmosphere
> most of the time, except maybe a boot over the tube
> but thats not sealed from humitidity anyway.. sounds
> like the ai was bad to start with to me.. get a
> replacement they should honor it...
>
> Danny..
> --- Brian <bsowell@d...> wrote:
> > Well, that could be what happened. It north Texas,
> > it goes from one
> > extreme to the other in hours. It was warm just
> > before the 3 day
> > freeze, and today it was in the 60's again. But now
> > even after the
> > cold, it reads somewhere between 50 and 110 knots
> > for no reason at
> > all...more the colder it gets. Obviously its broken
> > now regardless.
> >
> > And 20 degrees is dang cold for me.
> >
> > --- In vansairforce@yahoogroups.com, "Bill Swaim"
> > <bill@m...> wrote:
> > >
> > > There is a slight possibility that there was some
> > water present in
> > the
> > > instrument, but only you will know that. If the
> > storage area
> > temperature
> > > was warm with a normal relative humidity (35-50%)
> > just prior to
> > the freeze,
> > > water vapor (gas) trapped in the ASI would have
> > condensed to water
> > on the
> > > below dewpoint parts and then frozen. Kind of a
> > gas to liquid to
> > solid
> > > scenario. It has happened in the past here (not
> > aviation
> > related), but it
> > > is rare, since the temps & RH in Iowa usually
> > slide down prior to a
> > > temperature plummet. PS, 20 is not really cold,
> > but I guess it is
> > all
> > > relative.
> > >
> > > Bill Swaim
> > >
> > > -----Original Message-----
> > > From: Brian [mailto:bsowell@d...]
> > > Sent: Thursday, December 23, 2004 6:27 PM
> > > To: vansairforce@yahoogroups.com
> > > Subject: [VAF Mailing List] Airspeed indicator
> > damaged by the cold?
> > > My airspeed indicator that I bought from van's
> > about 6 months ago
> > is
> > > installed in my panel, but doesn't have pitot or
> > static lines
> > connected to
> > > it (still building) - the red plugs in the back
> > had never been out
> > until
> > > today.
> > >
> > > Last night, it got down to about 20 degrees F. or
> > maybe a touch
> > colder. The
> > > first hard freeze of the year in TX. Now my
> > airspeed indicator
> > reads 110
> > > knots. The little red plugs have holes drilled in
> > them from the
> > factory.
> > > Even so, I removed them and no change.
> > >
> > > It seems getting cold damaged it. Is that
> > normal??
> > > ------------------------ Yahoo! Groups Sponsor
> > --------------------
> > ~--> Make
> > > a clean sweep of pop-up ads. Yahoo! Companion
> > Toolbar.
> > > Now with Pop-Up Blocker. Get it for free!
> http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/1yWplB/TM
> -------------------------------------------------------------------
> > -~->
> > >
> > > Online help on this group at:
> > > http://help.yahoo.com/help/groups/
> > >
> > > Yahoo! Groups Links
> __________________________________
> Do you Yahoo!?
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Author: "David Domeier" <davidd010@...> Time: Wed Dec 29, 2004 7:31 am PST Link
--- In vansairforce@yahoogroups.com, "steve zicree" <szicree@a...> wrote:
>
> Dang!! Do they not test these things AT ALL before they send em out? Any
test would have immediately detected such a problem. Incidently, if you poke a
hole in the glue does the gauge go to zero? Glad you found the problem and
shared the info.
>
> Steve Zicree
I've been following this thread and am getting more and more confused.
First off, altimeters and ASI's shipped from Van's are tested and have paper to
back it up. You can not get past the DAR final without it, at least not around
here as I had to produce the test data sheet. The instruments are not officially
"certified" but the test data is required and is all that is required for experimental
certification.
Secondly, if that hole was glued shut, it would have showed up months ago
with any change in pressure. Temperature has nothing to do with it, its a
pressure change that causes the indication.
Thirdly, why would anyone glue a static port shut and install a plug over it?
None of this makes any sense unless their are terrorists in our midst.
dd
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Author: "Brian" <bsowell@...> Time: Wed Dec 29, 2004 2:19 pm PST Link
Well, I can't answer the 'should have been tested' question. My
instrument is a UMA instrument (American made). Van's would have
nothing to do with the testing (that's done at the factory --
presumably). I've tried to call UMA but they're not answering their
phones. (Closed this week??) Does anyone know for sure if every unit
needs to be tested or if only a few per production run? This is a
non TSO'd indicator.
I know that the hole is sealed shut. I said its 'glued' because it
looks like clear glue, but I really don't know. The hole is only
about 1/16 of an inch. Its sealed from the inside, because its a
nice and smooth plug looking from the outside. As far as showing up
months ago, I didn't have it out months ago. I bought it and put it
on the shelf in the box. I installed it in my panel more recently
and didn't pay much attention to it since that time...too busy with
other things, but I know it was reading zero. But when it got really
cold (20 degrees F), I noticed it read 120 knots. As my work area
heated up the reading dropped. Then when it was about 60 degrees, it
read zero again. Then the next day it read nearly 100 knots
because it was cold again, but not as cold, and approached zero as it
heated up.
Maybe its not pressure related - maybe its just temperature related
somehow. I don't really know because I'm no AI expert. But I know a
sealed hole when I see it. And it makes sense that a lower static
pressure (sealed volume, lower temperature) relative to pitot
pressure reads positively on the dial.
I don't think a small change in atmospheric pressure would read on
the dial as you presume. The first graduation on the dial is 40
knots and that is quite a bit of pitot - static pressure differential
at that speed. A small change of just a few inches of Hg caused by
normal atmospheric pressure changes would probably not move the
needle noticeably.
--- In vansairforce@yahoogroups.com, "David Domeier" <davidd010@e...>
wrote:
> --- In vansairforce@yahoogroups.com, "steve zicree" <szicree@a...>
wrote:
> >
> > Dang!! Do they not test these things AT ALL before they send em
out? Any
> test would have immediately detected such a problem. Incidently, if
you poke a
> hole in the glue does the gauge go to zero? Glad you found the
problem and
> shared the info.
> >
> > Steve Zicree
>
> I've been following this thread and am getting more and more
confused.
>
> First off, altimeters and ASI's shipped from Van's are tested and
have paper to
> back it up. You can not get past the DAR final without it, at
least not around
> here as I had to produce the test data sheet. The instruments are
not officially
> "certified" but the test data is required and is all that is
required for experimental
> certification.
>
> Secondly, if that hole was glued shut, it would have showed up
months ago
> with any change in pressure. Temperature has nothing to do with
it, its a
> pressure change that causes the indication.
>
> Thirdly, why would anyone glue a static port shut and install a
plug over it?
>
> None of this makes any sense unless their are terrorists in our
midst.
>
> dd
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Author: "Richard & Roberta Hegy" <rhegy@...> Time: Wed Dec 29, 2004 2:55 pm PST Link
Actually, the ASI will act like an altimeter when pressure changes and the pitot/ static ports are plugged. Very common knowledge among most pilots. One of the things were are taught as student pilots, so we can recognize a faulty pitot/ static system. Generally it is the static port that is the culprit. The pilot is taught to break the glass on the VSI when encountering static problems, if an alternate static source is not available.
FYI
Roberta
----- Original Message -----
From: Brian
To: vansairforce@yahoogroups.com
Sent: Wednesday, December 29, 2004 11:36 AM
Subject: Re: [VAF Mailing List] Airspeed indicator damaged by the cold?
Well, I can't answer the 'should have been tested' question. My
instrument is a UMA instrument (American made). Van's would have
nothing to do with the testing (that's done at the factory --
presumably). I've tried to call UMA but they're not answering their
phones. (Closed this week??) Does anyone know for sure if every unit
needs to be tested or if only a few per production run? This is a
non TSO'd indicator.
I know that the hole is sealed shut. I said its 'glued' because it
looks like clear glue, but I really don't know. The hole is only
about 1/16 of an inch. Its sealed from the inside, because its a
nice and smooth plug looking from the outside. As far as showing up
months ago, I didn't have it out months ago. I bought it and put it
on the shelf in the box. I installed it in my panel more recently
and didn't pay much attention to it since that time...too busy with
other things, but I know it was reading zero. But when it got really
cold (20 degrees F), I noticed it read 120 knots. As my work area
heated up the reading dropped. Then when it was about 60 degrees, it
read zero again. Then the next day it read nearly 100 knots
because it was cold again, but not as cold, and approached zero as it
heated up.
Maybe its not pressure related - maybe its just temperature related
somehow. I don't really know because I'm no AI expert. But I know a
sealed hole when I see it. And it makes sense that a lower static
pressure (sealed volume, lower temperature) relative to pitot
pressure reads positively on the dial.
I don't think a small change in atmospheric pressure would read on
the dial as you presume. The first graduation on the dial is 40
knots and that is quite a bit of pitot - static pressure differential
at that speed. A small change of just a few inches of Hg caused by
normal atmospheric pressure changes would probably not move the
needle noticeably.
--- In vansairforce@yahoogroups.com, "David Domeier" <davidd010@e...>
wrote:
> --- In vansairforce@yahoogroups.com, "steve zicree" <szicree@a...>
wrote:
> >
> > Dang!! Do they not test these things AT ALL before they send em
out? Any
> test would have immediately detected such a problem. Incidently, if
you poke a
> hole in the glue does the gauge go to zero? Glad you found the
problem and
> shared the info.
> >
> > Steve Zicree
>
> I've been following this thread and am getting more and more
confused.
>
> First off, altimeters and ASI's shipped from Van's are tested and
have paper to
> back it up. You can not get past the DAR final without it, at
least not around
> here as I had to produce the test data sheet. The instruments are
not officially
> "certified" but the test data is required and is all that is
required for experimental
> certification.
>
> Secondly, if that hole was glued shut, it would have showed up
months ago
> with any change in pressure. Temperature has nothing to do with
it, its a
> pressure change that causes the indication.
>
> Thirdly, why would anyone glue a static port shut and install a
plug over it?
>
> None of this makes any sense unless their are terrorists in our
midst.
>
> dd
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Author: "Phil" <wanderer@...> Time: Wed Dec 29, 2004 5:48 pm PST Link
If I understand this correctly, it was the plastic shipping plug that
was "plugged", not the actual static port in the instrument?
I'm guessing the instrument was tested, THEN the plugs were installed
and the unit shipped. I believe the plugs are just there to keep
bugs and other objects out till it's installed?
Phil
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Author: "Brian" <bsowell@...> Time: Thu Dec 30, 2004 5:04 pm PST Link
No. The 1/16 hole leading into the instrument (static port - inside
the 1/8 NPT fitting on the back) was sealed shut.
--- In vansairforce@yahoogroups.com, "Phil" <wanderer@m...> wrote:
> If I understand this correctly, it was the plastic shipping plug
that
> was "plugged", not the actual static port in the instrument?
>
> I'm guessing the instrument was tested, THEN the plugs were
installed
> and the unit shipped. I believe the plugs are just there to keep
> bugs and other objects out till it's installed?
>
> Phil
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