Schleicher pneumatic tube plumbing question

On Dec 6, 9:39*pm, Tuno wrote:
To answer my original question more accurately ... the manual
indicates the routing of the pressures, but does not describe the
implementation. As it happens, my 29 has small (maybe 2.5 or 3mm OD)
tubing from behind the instrument panel to under the seatpan, where
they step up to the larger size using the same kind of insert adapter
found on my O2 system controller.

The tubes going aft from there do not hold a vacuum (with the multi-
probe thoroughly sealed and inserted). I'm wondering (after talking to
CH) if the O-rings in the multi-probe's receiver were damaged ...

2NO

What is it the engineers say? One test is worth a thousand theories.
I'd put the probe in place then apply pressure with a syringe as you
watch the airspeed indicator. No indication = massive leak or pinched
line. Open the canopy and see what it reads.........keep checking till
you find the problem. I'd leak test all lines while I was at it. I use
a separate ASI that is T'ed to the syringe then hooked to the line I'm
checking. All should hold 100 knots on the ASI for 60 seconds.
JJ