Today's Message Index:
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1. 03:36 PM - Re: Pitot-Static (speedy11@aol.com)
2. 11:03 PM - Re: Re: Pitot-Static (Jorgen Nielsen)
Message 1
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| Subject: | Re: Pitot-Static |
Hi Jorgen,
We did ground tests of both sides and the left side is inoperative. That is one
reason we are digging into the system.
We discovered the third tube to the left boom is electrical siring - presumably
for the pitot heat.
The previous owner had the outboard sections of the wings sealed off and converted
into fuel tanks. As part of that conversion, apparently the wiring was fed
through an aluminum tube which was then sealed to prevent fuel from getting
to the wiring.
We are not going to use the internal wing tanks and we are attempting to determine
what is causing the issue with the pitot-static.
Stan Sutterfield
Port Orange, FL
Hi Stan
Not sure on three lines to left side.
However, just a question to help narrow down the fault: Have you
performed a pitot-static ground check on both sides? Were the results
the same?
Cheers Jorgen
-----Original Message-----
From: L29-List Digest Server <l29-list@matronics.com>
Sent: Sat, Dec 12, 2015 3:08 am
Subject: L29-List Digest: 2 Msgs - 12/11/15
*
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L29-List Digest Archive
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Total Messages Posted Fri 12/11/15: 2
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Today's Message Index:
----------------------
1. 07:13 AM - L-29 Pioto-Static (speedy11@aol.com)
2. 08:53 AM - Re: L-29 Pioto-Static (Jorgen Nielsen)
________________________________ Message 1 _____________________________________
Time: 07:13:09 AM PST US
From: speedy11@aol.com
Subject: L29-List: L-29 Pioto-Static
Request Help from L-29 Experts
I'm having an issue with the airspeed and altimeter indications being slow to indicate
properly. For example, during acceleration and climb the indicators lag
behind the actual numbers. Then when established in a steady state situation,
the airspeed and altimeter indicate exactly correct - as checked with an accompanying
aircraft. The same lag occurs as the aircraft is slowing or descending.
A ground pitot-static check indicates perfect with no leaks.
Our research has found no blockage thus far of the lines from the booms to the
fuselage.
However, we found three lines attached to the left boom (right boom has two).
Two of them are connected to the pitot and static lines. We are not sure where
the third line goes.
The maintenance diagrams show only two lines to the left boom.
Does anyone have three lines to their left pitot-static boom? Does anyone know
what the third line if for?
Thanks,
Stan Sutterfield
NX4477N
________________________________ Message 2 _____________________________________
Time: 08:53:39 AM PST US
From: "Jorgen Nielsen" <jorgen.nielsen@mweb.co.za>
Subject: RE: L29-List: L-29 Pioto-Static
Hi Stan
Not sure on three lines to left side.
However, just a question to help narrow down the fault: Have you
performed a pitot-static ground check on both sides? Were the results
the same?
Cheers Jorgen
From: owner-l29-list-server@matronics.com
[mailto:owner-l29-list-server@matronics.com] On Behalf Of
speedy11@aol.com
Sent: Friday, 11 December 2015 17:13
Subject: L29-List: L-29 Pioto-Static
Request Help from L-29 Experts
I'm having an issue with the airspeed and altimeter indications being
slow to indicate properly. For example, during acceleration and climb
the indicators lag behind the actual numbers. Then when established in
a steady state situation, the airspeed and altimeter indicate exactly
correct - as checked with an accompanying aircraft. The same lag occurs
as the aircraft is slowing or descending.
A ground pitot-static check indicates perfect with no leaks.
Our research has found no blockage thus far of the lines from the booms
to the fuselage.
However, we found three lines attached to the left boom (right boom has
two). Two of them are connected to the pitot and static lines. We are
not sure where the third line goes.
The maintenance diagrams show only two lines to the left boom.
Does anyone have three lines to their left pitot-static boom? Does
anyone know what the third line if for?
Thanks,
Stan Sutterfield
NX4477N
Message 2
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| Subject: | Re: Pitot-Static |
Hi Stan
Ok all noted.
There must be a restriction in the lines somewhere. You have already elimin
ated the possibility of leaks, and there is no blockage from the pitot tube t
o the fuselage.
In the standard configuration, the lines from both sides are fed to the sele
ctor valve in the front cockpit, i was hoping to narrow the search for the r
estriction by checking the response from the left pitot system, i.e. Slow re
sponse from the left side as well would indicate a restriction downstream o
f the selector, normal operation would have indicated a restriction between t
he selector and the wing....
With that not possible, and in light of the left side being inoperative, i w
ould start the search for a restriction around the selector. Presumably bot
h front and rear cockpits are slow to indicate. If so, the fault ls before t
he lines are divided between the 2 cockpits and instruments. , which brings u
s back to the selector valve , or the tubing between the selector valve and t
he water traps in the root of the wing.
You say you found no restrictions from the pitot tube to the fuselage, presu
mably you mean up to the water traps? That would be the easy, accessible pl
ace to check.
My gut feeling says its the selector valve...either not fully in position th
erefore restricting the lines, or a bad bypass job.
Keep us updated...i have family here for christmas but will try check the di
agrams later...
Regards Jorgen
Sent from my iPad
> On 13 Dec 2015, at 01:35, speedy11@aol.com wrote:
>
> Hi Jorgen,
>
> We did ground tests of both sides and the left side is inoperative. That i
s one reason we are digging into the system.
> We discovered the third tube to the left boom is electrical siring - presu
mably for the pitot heat.
> The previous owner had the outboard sections of the wings sealed off and c
onverted into fuel tanks. As part of that conversion, apparently the wiring
was fed through an aluminum tube which was then sealed to prevent fuel from
getting to the wiring.
> We are not going to use the internal wing tanks and we are attempting to d
etermine what is causing the issue with the pitot-static.
>
> Stan Sutterfield
> Port Orange, FL
> Hi Stan
>
>
> Not sure on three lines to left side.
>
>
> However, just a question to help narrow down the fault: Have you
> performed a pitot-static ground check on both sides? Were the results
> the same?
>
>
> Cheers Jorgen
>
>
>
> -----Original Message-----
> From: L29-List Digest Server <l29-list@matronics.com>
> To: L29-List Digest List <l29-list-digest@matronics.com>
> Sent: Sat, Dec 12, 2015 3:08 am
> Subject: L29-List Digest: 2 Msgs - 12/11/15
>
> *
>
> =========================
========================
> Online Versions of Today's List Digest Archive
> =========================
========================
>
> Today's complete L29-List Digest can also be found in either of the
> two Web Links listed below. The .html file includes the Digest formatted
> in HTML for viewing with a web browser and features Hyperlinked Indexes
> and Message Navigation. The .txt file includes the plain ASCII version
> of the L29-List Digest and can be viewed with a generic text editor
> such as Notepad or with a web browser.
>
> HTML Version:
>
> http://www.matronics.com/digest/digestview.php?Style=82701&View=html&C
hapter 15-12-11&Archive=L29
>
> Text Version:
>
> http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Ch
apter 15-12-11&Archive=L29
>
>
> =========================
======================
> EMail Version of Today's List Digest Archive
> =========================
======================
>
>
> ----------------------------------------------------------
> L29-List Digest Archive
> ---
> Total Messages Posted Fri 12/11/15: 2
> ----------------------------------------------------------
>
>
> Today's Message Index:
> ----------------------
>
> 1. 07:13 AM - L-29 Pioto-Static (speedy11@aol.com)
> 2. 08:53 AM - Re: L-29 Pioto-Static (Jorgen Nielsen)
>
>
>
> ________________________________ Message 1 _______________________________
______
>
>
> Time: 07:13:09 AM PST US
> From: speedy11@aol.com
> Subject: L29-List: L-29 Pioto-Static
>
> Request Help from L-29 Experts
>
> I'm having an issue with the airspeed and altimeter indications being slow
to indicate
> properly. For example, during acceleration and climb the indicators lag
> behind the actual numbers. Then when established in a steady state situati
on,
> the airspeed and altimeter indicate exactly correct - as checked with an a
ccompanying
> aircraft. The same lag occurs as the aircraft is slowing or descending.
>
> A ground pitot-static check indicates perfect with no leaks.
>
> Our research has found no blockage thus far of the lines from the booms to
the
> fuselage.
>
> However, we found three lines attached to the left boom (right boom has tw
o).
> Two of them are connected to the pitot and static lines. We are not sure w
here
> the third line goes.
>
> The maintenance diagrams show only two lines to the left boom.
>
> Does anyone have three lines to their left pitot-static boom? Does anyone k
now
> what the third line if for?
>
> Thanks,
>
> Stan Sutterfield
> NX4477N
>
> ________________________________ Message 2 _______________________________
______
>
>
> Time: 08:53:39 AM PST US
> From: "Jorgen Nielsen" <jorgen.nielsen@mweb.co.za>
> Subject: RE: L29-List: L-29 Pioto-Static
>
> Hi Stan
>
>
> Not sure on three lines to left side.
>
>
> However, just a question to help narrow down the fault: Have you
> performed a pitot-static ground check on both sides? Were the results
> the same?
>
>
> Cheers Jorgen
>
>
> From: owner-l29-list-server@matronics.com
> [mailto:owner-l29-list-server@matronics.com] On Behalf Of
> speedy11@aol.com
> Sent: Friday, 11 December 2015 17:13
> Subject: L29-List: L-29 Pioto-Static
>
>
> Request Help from L-29 Experts
>
> I'm having an issue with the airspeed and altimeter indications being
> slow to indicate properly. For example, during acceleration and climb
> the indicators lag behind the actual numbers. Then when established in
> a steady state situation, the airspeed and altimeter indicate exactly
> correct - as checked with an accompanying aircraft. The same lag occurs
> as the aircraft is slowing or descending.
>
> A ground pitot-static check indicates perfect with no leaks.
>
> Our research has found no blockage thus far of the lines from the booms
> to the fuselage.
>
> However, we found three lines attached to the left boom (right boom has
> two). Two of them are connected to the pitot and static lines. We are
> not sure where the third line goes.
>
> The maintenance diagrams show only two lines to the left boom.
>
> Does anyone have three lines to their left pitot-static boom? Does
> anyone know what the third line if for?
>
> Thanks,
>
> Stan Sutterfield
> NX4477N
>
>
>
>
>
>
>
>
>
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