ADAHRS and EMS fail in flight

[Tuiliere]

Hello Dynon,

I am stuck in a foreign airfield because today I failed my adahrs and my ems in flight. I have 2 SV D1000 and all worked fine until this day (45 hours). When I landed, I surched in the network statut where was the problem, and under my SV displays  I read the message : Skyvew network connection fault pair data 2 pin 4 and 8. Impossible for me to fly.. I checked all the connections clean them, but I didn't find anything. I suspected the fact my plane sleep for the first time outside. Humidity, perhaps a little rain shower during the night ? But I didn't find any water on the connection...
Please, can you help me ? I would like to come back my home..
In advance thank you
Sylvain from France

 

[Raymo]

Andrieu,

I found an example of this error in the Skyview manual. Here is what it says:

For example, a “SKYVIEW NETWORK CONNECTION FAULT – DATA 2 PAIR (PINS 4 AND 8)” listed below an SV-ADAHRS-200 listing in the network status page means that pins 4 and 8 on a SkyView Network harness or connector that goes to that component has a connectivity problem. This could be a broken wire, swapped wires, bad connection, etc., and should be analyzed with a multimeter or other direct method.

If the fault were instead listed under a SkyView display listing in the network status page, that means that the fault is seen on all devices connected to that display, and is likely due to a connectivity issue at or very near the display in your SkyView Network wiring scheme.

EDIT:
Here is the network connector pinout, since you probably did not carry a manual with you.

1 Green SkyView Network Data 1 A
2 Black SkyView Network Ground 1
3 White with Black Stripe SkyView Network Ground 2
4 White with Blue Stripe SkyView Network Data 2 B
5 Orange SkyView EMS Auxiliary Voltage
6 Blue SkyView Network Data 1 B
7 Red SkyView Network Power 1
8 White with Green stripe SkyView Network Data 2 A
9 White with Red stripe SkyView Network Power 2

 

[Tuiliere]

Thank you Ray for your message.

As said the manual, when the fault is listed under a SV, that means it concern all the devices connected. In my case, the message is under my 2 SV...is that means all my connections are crazy ? I don't understand what happens and how to find the solution..

 

[Tuiliere]

I precise the failures in flight are not continue but intermittently.

When I bought 2 SV D1000, it was for security, in order to have redondandcy and don't experiment a Total failure . And it is what's happened !

 

[rvator51]

Sure sounds like a wiring/ connector failure on you network cable that goes into the Skyview. Have you tried moving the network connector that plugs into the Skyview to a different DB9 connector on the Skyview? Are you using Dynon network cables or are the custom made? Is it possible to replace the network cable that plugs into the Skyview?

 

[Tuiliere]

Hello guys,

This morning, after a night in a hangar, no more message error on my SV system. I make a check flight and ..nothing. Today I flew 3 hours and nothing...
I think the water or humidity was the guilty ? What else ?
I'm worried for the futur because my plane will have to sleep outside again with the danger of a rain shower...
Is some RV7 tip up owner there to advise me what I have to do ?
In advance thank you
Sylvain

 

[rvator51]

I have heard tip ups are prone to getting water in at the front of the canopy. There is an aftermarket skirt that I have seen that keeps water off the avionics. Do you think some water dripped on the skyview from the rain? Can you put a waterproof cover pn the plane when left outside in the future?

 

[Tuiliere]

I already had the skirt but it seems it is not watertight. I also put a waterproof cover, but it seems the water went underneath...

 

[Raymo]

You can put some dielectric grease (DC-4) on the connectors to keep the water out.