Re: Grob 103 question

On May 23, 1:00 pm, Olin <ka...@xxxxxxxxxxxx> wrote:
We have a G103 with an esa-systems multi function probe. The probe
serves as a static, pitot and total energy ports. The socket that it
plugs into is mounted in the vertical stabilizer and Three tubes run
forward to service flight instruments. The socket contains three o-
rings to keep the three ports separated when the probe is inserted.
These o-rings deteriorate over time of course and allow leakage
between the ports and erroneous instrument readings.

Two of the o-rings are easily replaceable from the front opening. The
third o-ring is small (~1/8" ID) and not so easily replaced as it is
deep in the socket. Wings & Wheels has a nice diagram of the socket
(type UN).

It almost looks to me like you have to dig into the vertical stab and
remove the socket and disassemble it to remove this o-ring, unless
there is a special tool or method to get it out.

Any ideas? Perhaps some of you have traveled this road before.

Thanks.

You have it correct, you cut out the tripple probe mount to do this.
Good huh? Obviously try to confirm this is really the problem before
doing all this work (i.e. a leakdown test between the rear most and
middle ports.

I always put a tape over the probe port when not in use to keep dust
out.
Club ships etc. tied out are often best left with the probles left in
them to avoid wear and tear on the O-rings (others may disagree).
The annual was just done on my glider - including cleaning the mount
and lubricating the o-rings with a very small amount of silicone (make
sure this is being done to your glider, more frequently if the probe
is inserted/removed a lot).

Darryl
.

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