ADAHRS Warning

[Jeff_R]

I recently loaded Version 4 software and soon after, on the ground, got the ADAHRS crosscheck warning for a rate indicator error, or something like that (it was not a turn coordinator error). I ignored it, flew a few times and never had an issue, but when flying a few days ago it popped up again. I wasn't able to spend time troubleshooting, but it appeared that the primary ADAHRS unit was ok as the bank indicator on the secondary unit was not making sense. I disabled the secondary.

I assume I need to remove the secondary unit and send it in for repair.

My question is, until I remove the secondary unit, if a function on the primary unit goes bad, can the secondary unit be used for that function? For example, if the altimeter for the primary unit fails, will the altimeter function on the secondary take over? And when I disabled the secondary unit, did I turn the whole unit off, or just that failed module?

I have to assume the secondary unit has always been bad as the initial error indication came so quickly. I used the Dynon-supplied cables, so is it reasonable to assume the problem is not a wiring error and is, indeed, a problem with the unit?

I am trying to complete my 40 hour test flight period. I am grateful for the crosschecking software as I never had any idea that there was a problem.

 

[dynonsupport]

First - it would be good to know exactly what the reported error was.

But to answer your question, a single ADAHRS' data is used exclusively. Ie, if one fails, the other takes over. If you disable one, it is unavailable entirely.

The issue may or may not have always been there. Prior to SkyView 4.0, both ADAHRS units were capable of being displayed, but, typically, it tended to be the same one every time unless you manually selected the other. In your case, you probably saw the one good one every time.

 

[johnsteichen]

Re: ADAHRS Warning question

With version 4 I have had one ADAHRS warning. Instead of picking one unit, I exited out of the page,( vfr ) and it did not re occur. Does a single non recurring event like this require return of a unit?
:-/

 

[Jeff_R]

The problem does seem to be intermittent. Today I flew for well over an hour and no problem. I had no warning message indicating the secondary ADAHRS was disabled, which I believe shows that after you recycle power, the secondary unit will re-enable itself. After I landed I checked the setup and everything appeared normal - the secondary unit was in backup mode with no crosscheck errors.

If/when I get the error again, I will be sure to write it down and compare the displays to try to better see what is going on.

Other than this little issue, this system has been awesome!

 

[Jeff_R]

The problem I previously reported seemed to clear up.  Just yesterday I checked the setup, and my primary ADAHRS unit was enabled and the secondary unit in standby.  Neither were offline or deativated.

Today, however, I powered up EFIS #1 prior to engine start and it reported the error again:  ADAHRS CROSS CHECK ERROR(S):  TURN RATE.

Only the Pilot's EFIS was turned off - the right side EFIS was unpowered. I hit the CANCEL button and the error message went away.  After I started the engine and turned EFIS #2 on, I again got the error message.  I hit COMPARE.  For the left side window, a message near the top center said "SV-ADAHRS -201 S/N 02842 PRIMARY - ACTIVE".  For the left side of the display, the message was "SV-ADAHRS -200 S/N 0214x ALTERNATE- STANDBY".  (The x is a number that I can't tell now from my notes!)

The only difference I can tell between the two comparison windows is that the heading on the left says 010 and on the right is says 008.  Also, the left G meter shows a a very slight positive G (less than 1.1 G's) and the right side G meter shows a very tiny negative G.  Note these reading are on the ground with the brakes set and locked. 

I hit cancel again and the messages went away and didn't come back.  I did not fly (engine issues), but I did start the engine later in the day (still didn't fly) and did not get the crosscheck error message again.

And I flew a few days ago on two 45 mintue legs and had no error messages.  Any ideas?

 

[qpk@email.cz]

Hi. After upgrade to sw v.:4 warning ADHARS altitude crosscheck error. On the SkyView offered split ADHARS1/ADHARS2 page was the different typically 100 feet 2400 left 2300right. Warning sometime disappears and often appears most frequently during climbing. Instalation is in CTLS LSA, dual SkyView 10.4 panels and dual ADHARS. Help please. Petr (qpk@email.cz)

 

[Jeff_R]

In my last post where I said "Only the Pilot's EFIS was turned off .....", I meant the EFIS was turned ON. Sorry.

And I flew again for 1.5 hours yesterday and had no cross check errors.

 

[dynonsupport]

JeffR: On the ground, you should be seeing 1ish G. If you're seeing a slightly negative G reading on one of them, that's a problem that we'd need to see the ADAHRS to correct. The turn rate message means that the magenta turn rate that appears around the HSI is different between the two ADAHRS. If you see it more than on rare occasion, it also implies that one of the ADAHRS has an issue that we'd need to see to repair.

Petr: Are they correct on the ground?