pitot system leak check

[Flyer68]

I am testing the pitot as instructed in the production check list.
I am getting a time of 2-3 seconds between the air speeds. The instructions say
"max allowable pitot leak rate is 10 kt in 1 minute. "
Has anyone else done this test and where would the most likely place be for leaks?

[RFSchaller]

Mine was tight. The most likely source is the slip joint between the metal probe and the nylon instrument line.

[DHeal]

Also double-check the fitting at the ADHRS.

[rvbuilder2002]

Another possible leak source......

When builders drill the pitot tube for the anti-rotation screw, occasionally they go a little too far and fully penetrate the tube slightly. This causes a leak path that can be hard to find unless you disassemble the pitot tube.
Check all of the other (easier) connections first.

[9Driver]

Check the splice behind the instrument panel where the pitot line from the tail cone is connected to the line from the pitot tube. Mine had a leak there that a had quite a problem getting stopped.

[RV3bpilot]

I had two bad leaks when I checked mime. One was from the edges of the glass on the VSI, I sealed that with clear epoxy. The other leak came from air speed ind., it was leaking from the static side and out the pitot tube. I had to purchase a new air speed gauge. Now it is sealed up tight.

[D&M Dan]

Hi Bill, Wondering where your pitot leak was and how you repaired it, as I have the same issue.

[f1rocket]

Originally Posted by 9Driver

Check the splice behind the instrument panel where the pitot line from the tail cone is connected to the line from the pitot tube. Mine had a leak there that a had quite a problem getting stopped.

Ditto. This is where mine leaked as well.

[9Driver]

I finally stopped my leak by wrapping each end of the splice with two turns of .032 safety wire and twisting the ends enough to compress the outer tube. This stopped the leak and has stayed leak free through two required xpndr cks where they have to pump the system. Others may not agree with the method, but it worked.

[pyolet]

That double wrap safety wire technique works great, even on the 3mm tubing we use on R/C jet air gear actuator lines. I did the same on all my pitot/static vinyl line connections in the system when I recently upgraded to dual ADHRS and heated pitot. Woody

Originally Posted by 9Driver

I finally stopped my leak by wrapping each end of the splice with two turns of .032 safety wire and twisting the ends enough to compress the outer tube. This stopped the leak and has stayed leak free through two required xpndr cks where they have to pump the system. Others may not agree with the method, but it worked.