S3flyer Posted July 1, 2014 Report Share Posted July 1, 2014 Was flying straight and level today when my D100 suddenly changed to show me in a steep, uncoordinated, spiraling dive. The airspeed, altimeter and heading for all correct. I pulled the breaker and let it recycle but no luck. After I landed, I let it sit for 30+ minutes, then flipped it on but still showed the same relative situation. The screen was not frozen but it's straight and level image is considerably off. I've dropped a note to Dynon support and expect I'll have to ship it off to them for $250. Any thoughts? Link to comment Share on other sites More sharing options...
Anticept Posted July 2, 2014 Report Share Posted July 2, 2014 It's the adahrs that failed. Sorry about your luck. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted July 2, 2014 Report Share Posted July 2, 2014 Yeah, that sounds like a trip to the factory for sure. Link to comment Share on other sites More sharing options...
S3flyer Posted July 3, 2014 Author Report Share Posted July 3, 2014 Went back to the hangar today and the attitude display was still off so off to the factory it went. I did notice that when I pulled the unit that the pressure line was connected to a tee that wasn't terminated. This would make the AI read low, right? The D100 has always read 2-4 knots below my analog backup. Perhaps this explains it? Link to comment Share on other sites More sharing options...
Anticept Posted July 3, 2014 Report Share Posted July 3, 2014 Are you sure it wasn't terminated? Might have been plugged inside. It's got to be your static line if it wasn't plugged (cabin pressure is lower than static pressure due to effects of airflow around the aircraft "sucking" the air out), because you would have a really hard time with airspeed readings if it was the pitot line. Anyways, a deviation in readings is typical. That's why we have IAS vs CAS. CAS adjusts for instrument and installation error. Link to comment Share on other sites More sharing options...
S3flyer Posted July 3, 2014 Author Report Share Posted July 3, 2014 Nope, it was the Pitot. I'll have to check to see if it was plugged. In any event, guess I'll have the plumbing checked while I'm grounded. Link to comment Share on other sites More sharing options...
Anticept Posted July 3, 2014 Report Share Posted July 3, 2014 Do you have an AoA tube? Link to comment Share on other sites More sharing options...
S3flyer Posted July 3, 2014 Author Report Share Posted July 3, 2014 Just the pitot and static. The lines are labeled 'S' and 'P' with the P-line have the open tee connector. Link to comment Share on other sites More sharing options...
S3flyer Posted October 25, 2014 Author Report Share Posted October 25, 2014 Meant to close the loop. Dynon repaired the unit for no charge other than one-way shipping and it was multiple years out of warranty. Also turned out that the Tee used to be terminated but the tubing actually broke when I removed the D-100. The original tubing was pretty brittle so I replaced most of the runs with some nice Tygon tubing. I think I actually fixed a small leak or two. My airspeed now reads the same across both the analog gauge and D100. Also, I used to have a 150' correction for altitude in the D100 and now I've reset the correction to 10'. Link to comment Share on other sites More sharing options...
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