Autopilot pitch problem

[Jim Burns]

We've got an S-Tec 60-2 in our Aztec. After sitting out in a heavy pounding
rain last summer, we started experiencing run away pitch problems. I found
an S-Tec news letter that says this can happen when water gets into the
static system and the transducer can't read the proper static pressure. It
says to remove the static line from the transducer, cap it, and fly the
airplane with cabin static pressure going to the transducer to see if the
problem goes away. No problems have been noted with any of the pitot/static
instruments.

Has anybody had this happen? Does anybody know what the transducer looks
like? Obviously it's attached to a static line, and S-Tec says that it
should be mounted in a warm dry place, but I'm wondering what I should look
for.

Thanks
Jim

[Steve]

> We've got an S-Tec 60-2 in our Aztec. After sitting out in a heavy
pounding
> rain last summer, we started experiencing run away pitch problems. I found
> an S-Tec news letter that says this can happen when water gets into the
> static system and the transducer can't read the proper static pressure. It
> says to remove the static line from the transducer, cap it, and fly the
> airplane with cabin static pressure going to the transducer to see if the
> problem goes away. No problems have been noted with any of the
pitot/static
> instruments.
>
> Has anybody had this happen? Does anybody know what the transducer looks
> like? Obviously it's attached to a static line, and S-Tec says that it
> should be mounted in a warm dry place, but I'm wondering what I should
look
> for.
>
> Thanks
> Jim

Look at http://www.s-tec.com/pdf/SYS60-2.pdf. It's the little blue round
thingy.

[Jim Burns]

Thanks. Now I just need to find where it's mounted.
Jim

[Javier Henderson]

"Jim Burns" > writes:

> Thanks. Now I just need to find where it's mounted.

Find the static ports dedicated to the a/p pressure sensor, then follow
the tubing.

-jav

[Jim Burns]

That brings up a great question... Will there be a static port specifically
dedicated to the pressure transducer, or could the line going to the
pressure transducer simply be T'd into the instrument static tubeing? I'm
hopeing that it is a dedicated source/line, because it would simplify
matters if we indeed find water in the line.
Thanks
Jim

"Javier Henderson" > wrote in message
...
> "Jim Burns" > writes:
>
> > Thanks. Now I just need to find where it's mounted.
>
> Find the static ports dedicated to the a/p pressure sensor, then follow
> the tubing.
>
> -jav

[Javier Henderson]

"Jim Burns" > writes:

> That brings up a great question... Will there be a static port specifically
> dedicated to the pressure transducer, or could the line going to the
> pressure transducer simply be T'd into the instrument static tubeing? I'm
> hopeing that it is a dedicated source/line, because it would simplify
> matters if we indeed find water in the line.

I have owned two airplanes with S-Tec autopilots, on both cases there
were two static ports dedicated to the a/p.

-jav

[Jim Burns]

Thanks. I'll check it out.
Jim

"Javier Henderson" > wrote in message
...
> "Jim Burns" > writes:
>
> > That brings up a great question... Will there be a static port
specifically
> > dedicated to the pressure transducer, or could the line going to the
> > pressure transducer simply be T'd into the instrument static tubeing?
I'm
> > hopeing that it is a dedicated source/line, because it would simplify
> > matters if we indeed find water in the line.
>
> I have owned two airplanes with S-Tec autopilots, on both cases there
> were two static ports dedicated to the a/p.
>
> -jav

[Juan Jimenez]

The answer to that question usually depends on whether the a/p was factory
equipment, or an add-on...

"Jim Burns" > wrote in message
...
> That brings up a great question... Will there be a static port
> specifically
> dedicated to the pressure transducer, or could the line going to the
> pressure transducer simply be T'd into the instrument static tubeing? I'm
> hopeing that it is a dedicated source/line, because it would simplify
> matters if we indeed find water in the line.
> Thanks
> Jim
>
> "Javier Henderson" > wrote in message
> ...
>> "Jim Burns" > writes:
>>
>> > Thanks. Now I just need to find where it's mounted.
>>
>> Find the static ports dedicated to the a/p pressure sensor, then follow
>> the tubing.
>>
>> -jav
>
>

[cc]

My STec setup also has its own static port.

[Jim Burns]

Ours is too. Tested the transducer as prescribed by S-Tec, it was fine.
Found the trim servo mis-wired. Problem solved.

Jim

"cc" > wrote in message news:0LELd.4006$0O4.1673@trnddc03...
> My STec setup also has its own static port.
>
>