Electronic TE compensation, will this work?

On Wednesday, February 12, 2020 at 12:57:27 PM UTC-8, JS wrote:
Sometimes the probe itself can get plugged. If too much or too heavy lubricant has been applied, ports may gum up.
Multiprobes are easily damaged. Borrow someone else's probe and fly with it.
Or test with your own then with the borrowed one.

While fixing problems is more difficult than single probe, testing a multiprobe isn't difficult.
Essentially use a syringe and the ASI alone (as in Reichmann's book) to test each of the isolated lines for leaks, with probe attached and ports sealed.
Check for crosstalk between circuits. Pitot is the thin port at the end, static at the change in tube diameter, TE the hole in the side.

One day in the shop we found two bad multiprobes out of five tested. The other three probes worked on all three gliders. Glad it wasn't the mounting sockets!
It doesn't take much leakage to throw compensation off.

Electronic TE works very well. Personally used it with Cambridge, LX and ClearNav varios. Some varios require TE connection be connected to static. Some (ie: ClearNav) don't, so you can try both settings in the air.
Many of us have used electronic compensation in gliders that don't have a multi-probe. The 302 in my LS6a worked remarkably well with electronic compensation.
Jim

I did all the leak testing already, but I can't actually pinpoint the exact location of the leak. I stuck a small scope camera down the socket in the fin where the TE prob gets plugged into and this is the photo of it.

https://photos.app.goo.gl/wu5LUibL2KpF9eWZ6

I have no idea what im looking at, but it looks like the thing in the center has broke loose and i have a feeling that is where the leak is coming from. Kind of strange looking. Not sure what that is in the center of the tube.

Why not take this glider to an A&P and get their help in solving whatever problem you have properly. Wether that is fixing it for you or helping you learn how to do that under supervision.

On Wednesday, February 12, 2020 at 2:34:56 PM UTC-8, Darryl Ramm wrote:
Why not take this glider to an A&P and get their help in solving whatever problem you have properly. Wether that is fixing it for you or helping you learn how to do that under supervision.

Too easy. Only the brave get out the sawzall.

On Wednesday, February 12, 2020 at 4:07:53 PM UTC-5, soaringjac wrote:
https://photos.app.goo.gl/wu5LUibL2KpF9eWZ6
I have no idea what im looking at...

Clearly a Dr. Who rerun.

On Wednesday, February 12, 2020 at 5:23:35 PM UTC-8, Dave Nadler wrote:
On Wednesday, February 12, 2020 at 4:07:53 PM UTC-5, soaringjac wrote:
https://photos.app.goo.gl/wu5LUibL2KpF9eWZ6
I have no idea what im looking at...

Clearly a Dr. Who rerun.

Attack of the o-ring men?
The Three o-rings?

---

It's likely an o-ring. But so what. Looking in the hole may not tell you much, well not from a single photo.

Again, take this to an experienced glider A&P and get help. Especially because you are working on a type certificated aircraft and I am guessing you are not qualified to. A competent glider A&P will be able to determine exactly what is going on, what's leaking or cross leaking and then spend time trying to find out where. They should be very experienced at trying to work out if it's a faulty o-ring or probe or mount connection, or whatever and have the right tools to pick out and replace o-rings. maybe correct o-rings on hand, able to cut out and replace the probe mount if that is needed, etc. etc. etc.

You fix problems by fixing them, ideas of leaving TE lines faulty and trying to use them as static are a waste of your time. "running out of time" is the entirely wrong attitude here.

I think the photo shows the back of the TE attachment fittings. I
would say the tubing has come off. Easy fix. Get drawings, drill a
hole in the side of the fin, reattach and repair the hole according
to repair manual. Would require a licensed A&P to sign off.




t 02:27 13 February 2020, Darryl Ramm wrote:
On Wednesday, February 12, 2020 at 5:23:35 PM UTC-8, Dave
Nadler wrote:
On Wednesday, February 12, 2020 at 4:07:53 PM UTC-5,
soaringjac wrote:
https://photos.app.goo.gl/wu5LUibL2KpF9eWZ6
I have no idea what im looking at...
=20
Clearly a Dr. Who rerun.

Attack of the o-ring men?
The Three o-rings?

---

It's likely an o-ring. But so what. Looking in the hole may not tell
you
mu=
ch, well not from a single photo.

Again, take this to an experienced glider A&P and get help.
Especially
beca=
use you are working on a type certificated aircraft and I am
guessing you
a=
re not qualified to. A competent glider A&P will be able to
determine
exact=
ly what is going on, what's leaking or cross leaking and then
spend time
tr=
ying to find out where. They should be very experienced at
trying to work
o=
ut if it's a faulty o-ring or probe or mount connection, or
whatever and
ha=
ve the right tools to pick out and replace o-rings. maybe correct
o-rings
o=
n hand, able to cut out and replace the probe mount if that is
needed,
etc.=
etc. etc.

You fix problems by fixing them, ideas of leaving TE lines faulty
and
tryin=
g to use them as static are a waste of your time. "running out of
time" is
=
the entirely wrong attitude here.=20

Just pull the adapter (with tube attached) out of the fin leading edge and install new one:

https://www.esa-systems.com/en/produ...ter-st1r-6-mm/

Should be possible with little effort, the adapter is just glued to place.

On Thursday, February 13, 2020 at 2:59:36 AM UTC-8, krasw wrote:
Just pull the adapter (with tube attached) out of the fin leading edge and install new one:

https://www.esa-systems.com/en/produ...ter-st1r-6-mm/

Should be possible with little effort, the adapter is just glued to place..

Thanks Krasw
Just got the drawings from Grob (linder). It does look like there is a barbed fitting at the end of the TE socket, and it seem like that is what has broken off based on the photo i took. Seems like having that whole tube replaced by an A&P isn't going to too bad of a process, but who knows, could turn out to be a pain. Really don't want them to have to cut any holes in the skin or have to do any major composite work. Will chat with the A&P and composite shop about this.

At 15:09 13 February 2020, soaringjac A four inch dia hole should
suffice for access. Is not a big deal. Done that before.

On Thursday, February 13, 2020 at 2:59:36 AM UTC-8, krasw
wrote:
Just pull the adapter (with tube attached) out of the fin
leading edge
an=
d install new one:
=20

https://www.esa-systems.com/en/produ...ails/mounting-
adapter-st1r-6-m=
m/
=20
Should be possible with little effort, the adapter is just glued
to
place=
..

Thanks Krasw
Just got the drawings from Grob (linder). It does look like there
is a
barb=
ed fitting at the end of the TE socket, and it seem like that is
what has
b=
roken off based on the photo i took. Seems like having that
whole tube
repl=
aced by an A&P isn't going to too bad of a process, but who
knows, could
tu=
rn out to be a pain. Really don't want them to have to cut any
holes in
the=
skin or have to do any major composite work. Will chat with the
A&P and
co=
mposite shop about this.

On Thursday, February 13, 2020 at 7:09:25 AM UTC-8, soaringjac wrote:

...Really don't want them to have to cut any holes in the skin or have to do any major composite work. Will chat with the A&P and composite shop about this.

Just as an aside, composite repair isn't really all that hard or complicated. My favorite book on the topic is the Ursula Hanle "five P" guide, the "Petite Plastic Plane Patch Primer." You can find it for free on the web.