AOA Issues

[gevertex]

Hey all,

   A couple years back I had my panel redone (G3X touch), and a Garmin AOA installed. For the life of me I can't get it to work properly. I've been back to the shop a few times, followed their instructions to the letter. Once calibrated, on the next climb from ground level, the AOA will slowly indicate a higher and higher AOA until I get a stall warning alert. It never displays on landing, even though I get much slower on landing than in climb.

In the images, you'll notice that the AOA indication increases while the speed stays relatively constant. I would expect AOA to be relatively the same for the same speed with maybe some small changes due to altitude.

Any ideas?

[Bolter]

If the Garmin AOA is just a glorified air speed indicator instead of a real moving vane type, then it seems like a blocked inlet port.  It is essentially tracking altitude, not airspeed.  When you leveled off, it slowly restored, like 95% blockage will eventually let some air equalize.  

[gevertex]

10 hours ago, Bolter said:

If the Garmin AOA is just a glorified air speed indicator instead of a real moving vane type, then it seems like a blocked inlet port.  It is essentially tracking altitude, not airspeed.  When you leveled off, it slowly restored, like 95% blockage will eventually let some air equalize.  

Yes, two holes in the bottom of the pitot tube that measure air pressure.

[gevertex]

I'll get a drill bit and probe the probe to see if there is any blockage. I had understood this was checked already, but I agree the data does look like 1 or more ports are blocked.

[Pinecone]

Could also be kinked tubing.