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Dual Dynon ADAHRS Static / Pitot plumbing

RV6-KPTW

Well Known Member
Does anyone have a photo of the dual Dynon ADAHRS plumbing at the units? I have a leak I am chasing and now is a good time to redo my earlier effort. Photos show several different configurations and those that look neater actually didn’t work. The messiest configuration is the final used and I still find this offensive. I struggled with this at the time and settled.
 

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Hi Dennis,
I used press-fit connectors. (Can't remember the actual name of these connectors).
3 (Y) plus 1 (T) connector.

Pitot and AOA lines into the Y, then into both ADAHRS
Both Static lines into the T, then Y, then into both ADAHRS

I would argue that the ADAHRS could face the other way, making for shorter tubing to the Y's, and the electrical connector facing forward...

Photos are worth 1000 words each.
 

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I had terrible luck with the press fit connectors and switched to Nylo Seal. Nylo Seal does not have the 2 into 1 unit that you show. That would make the RV14 install easy.

I might make a manifold in lieu of connectors off the back of the ADAHRS units unless someone with a RV14 who used Nylo Seals can show me a better way.

Thanks
 
Hi Dennis,
I used press-fit connectors. (Can't remember the actual name of these connectors).
3 (Y) plus 1 (T) connector.

Pitot and AOA lines into the Y, then into both ADAHRS
Both Static lines into the T, then Y, then into both ADAHRS

I would argue that the ADAHRS could face the other way, making for shorter tubing to the Y's, and the electrical connector facing forward...

Photos are worth 1000 words each.

Very clean install, nicely done.
 
Nylo is always my favorite, never leak.
Can't tell you how many times I've replaced leaking push-on during PS tests.
 
Thanks Walt,

One year, 80 hours flown, 2 leak tests, no issues.
Will monitor regularly.
 
We used Y-connections in the wing just before the ADHRS. Take care of the aileron pushrod to keep the tubes away. We had to use silicon grease on all connections to eliminate static leaks…
 

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ADAHRS option

This one didn't leak. Easy for biannual inspection as well

DSCN10052.JPG
 
Patrick and Fabian,

Thanks for the views. I am trying to avoid the push in style connector due to past leak experiences. I have not found a Nylo 2 into 1 connector - that would make this easy.

I do like Patrick’s standoff approach and will see if I can do something similar with Nylo connectors.
 
ADAHRS

Here’s how I plumbed mine to minimize the number of potential leak points.
 

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Agree with Walt

Nylo is always my favorite, never leak.
Can't tell you how many times I've replaced leaking push-on during PS tests.

I recently help a friend sell his RV9A. Two years ago he paid to have his panel upgraded from a six pack to the GRT 10.1 EFIS system. The “professionals” who installed the upgrade used a mix of aircraft and non-aircraft tubing and the same “push on” connectors as in your pictures. I had to pull the EFIS to access an electrical issue behind the panel and the pitot-static connections behind the panel just fell apart with tubes and connections literally falling to the floor. It was a mess!

Wound up paying a local avionics shop to reconnect and label the connections in case it happened again - which it immediately did! Let’s just say the results were ugly with the local avionics shop refusing to touch it again (another story). Our test flight resulted in highly inaccurate airspeed and altitude readings - all because the push-on connections weren’t sealing.

Had to fly the aircraft to another avionics shop where a complete replumbing of the pitot-static system using Nylo connectors was accomplished. That shop did a great job, help us out of an jam and quickly got the aircraft ready for the buyer. Personally, quick connectors might be okay for plumbing water systems but I don’t think I’d risk my life using them in an aircraft. Every avionics professional I’ve talked to say “push on” connectors will leak within a few years time.
 
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Here's how I did mine in the RV-14 Wing. It hasn't been leaked checked yet. I used a heat gun to bend the 90s. In my experience, the press fittings work fine if there are no side loads on the tubes. I've had leaks with Nylo fittings.

IMG_0989.jpg
 
I used easy to install and flexible tygon tube with black polyethylene fittings from ACS and years later the tube remains soft, flexible and leak free. If doing again I would use the stronger white nylon fittings.

The only issue has been it can be difficult to remove the tube from the fittings with multiple barbs (OK on fittings with one barb). Easy solution is to cut off the old tube and install new.

Fin 9A
 
I asked a local avionics shop about push on versus nylo connections.
They said they have NOT had good luck with push on's.
I trust them and plan on going with nylo's.
 
This is a -10; ADHRS not stacked atop each other as yours are, but the tubing layout shows that sometimes neat and functional can in fact coexist.

Sorry about the upside down second pic.
 

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