So I ran a preasure test as described in ac-90-89

It did not pass and showed a small leak loosing from 90 knots to 78 k it's in 60 seconds.

What did you use to seal the plastic to plastic tubing a and fittings.


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I've seen them use teflon tape on the nylon fittings in factory aircraft.  It's about the only place I would use teflon tape on an aircraft.


I did use the Teflon tape on the plastic fittings going int the back of my instruments.

Wat about clamping at the his to fitting junctions.

What are you guys using as a clamp?

Did anybody else perform the leak down test described?


I never have done a leak test.

Where you can, like usually on straight joints, I use electrical heat shrink to seal. works good.

For clamps I just use 1/4" tie wraps. There's not much clamp force there but it's always worked for me especially if the fitting has a swell in it instead of the barb type.

And here's another way...

I might not do this on a 200kt aircraft, but I have no problem with the 750. The bottom picture is a "sophisticated" system that has been exposed and has worked for 9 years. On sun exposed flexible tubing connectors I change them about every two years or so.

Walt Snyder


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