DUAL ADAHRS Turn Rate Warning while standing still

[gmnewsted]

I have dual ADAHRS's 201/200 installed with the factory bracket and in a magnetically 'quiet' area.   The 200 has worked flawlessly for several years.  After installing the second unit, the 201, I will occasionally get a "Turn Rate" error message and the screen asking which unit I wish to disable.

First question; why would I be getting a turn rate error while sitting still on the ground and the engine not even running?  This happens as soon as I power up (Dual Skyviews).

Second question: There seems to be very little documentation describing what to do with ADAHRS comparison errors.  Yes sure, I can disable one, but in this case it is not at all clear 'which' one is giving the error.  Just a little more info on how to resolve comparison errors would be helpful.  Do I just send them both back?

 

[Dynon]

Start with a conversation or email directly with our support staff, especially if the comparison screen isn't yielding an obvious answer. Even if they don't have an instant answer for you, we may be able to help without having you send both your ADARHSes back with the help of data logs.

In general, the comparison error lets you know that the ADAHRS are not agreeing (within a margin of error) on an instrument value. Most of the time, it's obvious which one it is. In your case, is there any observable turn rate when you go into the comparison page on either of them (assuming you're not moving). If not, is either of their pitch or roll slightly wrong (again, when totally still).

 

[DBRV10]

Have seen this on my aircraft, usually when taxiing (but I must say very rarely) I have seen it on two customer aircraft, one taxiing and one yesterday sitting in the hangar.

I suspect the comparison code is just a fraction too sensitive on this parameter and there is actually no problem at all.