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  #11  
Old 07-29-2017, 09:01 AM
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scottmillhouse scottmillhouse is offline
 
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It sounds like the reverse of the AOA. If you have an AOA perhaps miss calibrated. It may be picking up flow from prop and in flight? AOA starts with a slow beep than increases until a steady tone at stall when properly calibrated.
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  #12  
Old 07-29-2017, 09:23 AM
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DaleB DaleB is offline
 
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If you have AoA configured but no input installed, it's probably going to act pretty squirrelly. There's normally a plastic plug installed in the AoA port, so it will sense whatever pressure it has. That will depend on leakage, ambient pressure, who knows. If it were me, I'd look to be sure it doesn't have the AoA tubing and port installed (which you've already done). If not, I'd disable AoA in the Skyview until the AoA line is installed, if you decide to do so. If unsure, you could pull the left wing out a few inches to verify, it's not difficult. There may even be one or two guys at KMLE that would be happy to help you, if you haven't done it before.
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  #13  
Old 07-29-2017, 10:15 AM
Strappe Strappe is offline
 
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The user logs show measured angles of attack. So this plane must have an AoA tube somewhere. Any suggestions re: where else to look for it?
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  #14  
Old 07-29-2017, 10:19 AM
Strappe Strappe is offline
 
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Also, the recorded AoA when stationary in the hangar appears to be 99%...

Last edited by Strappe : 07-29-2017 at 10:28 AM.
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  #15  
Old 07-29-2017, 10:31 AM
DHeal DHeal is offline
 
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Location: Windsor, California
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See DaleB's suggestion #12 above.
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  #16  
Old 07-29-2017, 11:10 AM
BigJohn BigJohn is offline
 
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Quote:
Originally Posted by Strappe View Post
The user logs show measured angles of attack. So this plane must have an AoA tube somewhere. Any suggestions re: where else to look for it?
Pull the instrument compartment cover, find the AOA port on the back of the Dynon, follow the tubing.
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  #17  
Old 07-29-2017, 11:38 AM
DHeal DHeal is offline
 
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If he has a Skyview unit, the AOA connection port is located on the ADHRS module which is located behind the baggage compartment bulkhead.
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  #18  
Old 07-29-2017, 08:15 PM
alexe alexe is offline
 
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Bud,

As Dave mentioned above, the AOA probe winds up at the ADAHRS unit, which is behind the baggage bulkhead. The other end, the probe, is nothing more than a chrome rivet located under the leading edge of the wing near the stall warning switch (left wing). The plastic tube coming from the ADAHRS is attached to the back of that rivet. At least, that is the current installation recommendation from Van's.

Some time ago, folks were using a ball inflator needle, like you would fill a football with, as the AOA probe. If that is what you have, it should be also mounted somewhere near the stall warning switch.
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  #19  
Old 07-29-2017, 08:55 PM
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Tony_T Tony_T is offline
 
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If I were in your shoes and trying to familiarize with a new airplane and avionics, I would not mess with the AOA installation at all or try to trace any tubing, etc. At this point why take off the rear bulkhead (and maybe have to pull the fuel tank) to check the connection to the ADHRS. Get the noise turned off and enjoy your new plane.

Just turn off AOA audio until you are comfortable with everything else. It doesn't matter if there is tubing present or not or if the red plug is in the ADHRS AOA port. The AOA can be exposed to static pressure without tubing present, in fact the installation manual says that the red plug actually has a small hole in it.

Press buttons 7&8 to enter the setup menu then: SETUP MENU>SYSTEM SETUP>AUDIO SETUP>AOA VOLUME: (0% TO 100%). Set it to 0.

I don't think there is a toggle to turn it off, you can just set it's volume to 0.

This will confirm that the problem actually is the AOA, and if it is you can fly the plane without the annoyance of the beeping tone.

Later, if you want to get the AOA working, determine if there is the tubing and port present on the wing and just do a calibration and set the volume where you want it. Or if there is no AOA connections present, buy the Van's retrofit AOA kit and install it at next annual when you have all the inspection covers off and the wings off.
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Last edited by Tony_T : 07-29-2017 at 09:00 PM.
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  #20  
Old 07-29-2017, 09:55 PM
Mich48041 Mich48041 is offline
 
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I agree with Tony. Calibrate the AOA per Dynon's installation manual. Save hardware troubleshooting for later if there still is a problem after AOA calibration. Do NOT disable the AOA. It might save your life some day.
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