ADAHRS Fail

[SkippyDiesel]

Without any warning, my ADAHRS -200 failed, after just 132 hrs in service.
Local Dynon agent unable to fix. Supplied loan module, which worked perfectly.
"Old" unit sent to USA for assessment / repair.
No explanation on old module failure.
New (not rebuild) replacement (charged full price, as out of calendar warranty) supplied. Frozen compass, would not accept callibration.
US & local Dynon techs unable to come up with a remedy.
Removed new unit, replaced with loan modul - all good for now.
Anyone else had an ADAHRS-200 module failure?

 

[jakej]

Nope - done many installs. Hope it works out ok for you

 

[airguy]

I had one die from water ingress, but no other problems.

 

[andresmith76]

I had an HDX ADAHRS-200 fail after I upgraded the system software last year from 16.7.0 to 17.0. Dynon tech support helped me roll back the software to 16.7 but that did not remove the big red X from the display. I eventually had to replace the unit with a refurbished one to get my system functional again.

 

[SkippyDiesel]

I had an HDX ADAHRS-200 fail after I upgraded the system software last year from 16.7.0 to 17.0. Dynon tech support helped me roll back the software to 16.7 but that did not remove the big red X from the display. I eventually had to replace the unit with a refurbished one to get my system functional again.

Did you have to pay for the refurbished module?

 

[airguy]

Did you have to pay for the refurbished module?

I did, it was well out of warranty period.

 

[andresmith76]

Did you have to pay for the refurbished module?

No. As the software upgrade was what caused the unit to fail, Dynon replaced the defective module at no charge.

 

[TrevorMills]

After around10 months of operation my unit failed. It reported 20 kts airspeed at rest and no amount of calibration would correct it. As it was in warranty Dynon replaced it FoC.

 

[SkippyDiesel]

New ADAHRS now up & working, thanks to a download doing its electronic compatibility magic

 

[SkippyDiesel]

As of yesterday, 4 hrs since install, new ADAHRS no longer working!!!!!!??????

 

[jakej]

Skippy - beare with me on this, High or Low wing? Where is the ADAHRS mounted?
PM me if you wish.

 

[SkippyDiesel]

Hi Jakej,

The aircraft is a low wing, Sonex Legacy

The ADAHRS is mounted, high, behind the passenger (starboard) seat.

All mountings are non magnetic

 

[jakej]

and the static ports ? What I’m trying to establish is the chance that water/ condensation may have entered the ADAHRS in any way?
Have you checked for that?
IMO & experience, it’s highly unusual to have the same thing happen with 2 ADAHRS, without a common cause & unlikely to be the same fault in the new one. I’ve never seen (doesn’t say it can’t happen) a bad ADAHRS or ‘talk’ of it in the forum yet, caused by a manufacturing fault.

 

[SkippyDiesel]

The static/pitot & AofA are located on a single "mast" about mid span on the lower side of the right wing.
The combined ports are always covered when aircraft not in use and are a very long way from & below the height of the ADAHRS module.
While moisture entry is always possible, I would think it's highly unlikly

 

[maartenversteeg]

Are you describing a setup where you have static pressure, pitot pressure and AofA, meaning all three values measured by the ADAHRS mounted on a single "mast"? Meaning that you are not using the Dynon pitot and AofA probe? The standard Dynon setup is to have Pitot and AofA pressure mounted on a "mast" and then have a static pressure on one or both sides of the fuselage of the plane. Having all three pressures taken at the same point under the wind would be great but it would mean that you have a different setup from the nominal 'Dynon' configuration. Not that that is wrong and it might be actually better but if you are exploring new ways then you might find interesting features

 

[swatson999]

Hard to see how the pitot/static setup would cause two ADAHRS boxes to fail.

And given that it's two ADAHRS units that failed, my money is on it being something external to the ADAHRS unit itself. Some sort of wiring problem somewhere.

 

[maartenversteeg]

I agree, an electrical issue is much more likely for a common issue that happens to cause multiple ADAHRS units to fail in the same setup. Still strange that the new unit initially worked and then failed after just 4 hours. Either the person asking the question is very unlucky in getting two failing ADAHRS units, but it might suggest that there must be something in common between the two cases.
I was just interested in/asking about the description of the setup. Having a setup that combines all three pitot measurements at the same location is/might be interesting. But there are many GA and homebuild airplanes where the static pressure for the pitot measurements uses one or two ports on the sides of the plane. The Dynon pitot tube only measures dynamic pitot pressure and the AofA pressure using a second port under a 45 degree angle and my question was more related how a static port was implemented in this confiuguration

 

[swatson999]

I think Piper pitot masts had a static port on the back or bottom side, IIRC from way back when I was flying Cherokees and Arrows. I'll have to dig out the info to confirm.

Found it...check out this thread, post 17...

Pitot tube on Piper Archers

No one can seem to give me a straight response on this question. On the Archer there is a pitot mast that comes down from the left wing. The front hole is obviously where the ram air is received. There are two more holes on the mast that I can't figure out. One is at the bottom and one is on...

jetcareers.com

 

[SkippyDiesel]

Are you describing a setup where you have static pressure, pitot pressure and AofA, meaning all three values measured by the ADAHRS mounted on a single "mast"? Meaning that you are not using the Dynon pitot and AofA probe? The standard Dynon setup is to have Pitot and AofA pressure mounted on a "mast" and then have a static pressure on one or both sides of the fuselage of the plane. Having all three pressures taken at the same point under the wind would be great but it would mean that you have a different setup from the nominal 'Dynon' configuration. Not that that is wrong and it might be actually better but if you are exploring new ways then you might find interesting features

Yes. As stated single, home made/designed, mast for all three functions

 

[SkippyDiesel]

The original (first ) module worked faultlessly for about 130 hrs.
Second, was the loan module - for about 5 hrs or so (would have to to check log) also without fault.
The new, as stated , 4 hrs.

Have reported problem to local agents - they have asked for more information.