My AOA alarm which is connected to the intercom activates as expected when approaching the stall but does not switch off when taxiing after landing. I have set the min speed to 40 Knots, which works OK on take off but not landing. Any ideas? I have the latest software.
AOA alarm off problem.
- Thread starter VR4Pilot
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So this would happen if your AOA continues to read as being in the red when you're on the ground. A few generic suggestions that may help:
Experiment with the position that the alarm comes on at in the AOAALM menu, as well as the cutoff threshold.
Additionally, try doing a SPDCAL to set what zero airspeed looks like. Be sure to do this in ABSOLUTELY still air, preferably in a closed hangar.
Try redoing the AOA calibration, varying the degree of stall you take the airplane to to see if this helps. If you want to be able to go back to your original AOA calibration after experimenting, take a firmware backup before you do this.
Also, what kind of airplane is this, and where is the AOA/Pitot mounted?
Experiment with the position that the alarm comes on at in the AOAALM menu, as well as the cutoff threshold.
Additionally, try doing a SPDCAL to set what zero airspeed looks like. Be sure to do this in ABSOLUTELY still air, preferably in a closed hangar.
Try redoing the AOA calibration, varying the degree of stall you take the airplane to to see if this helps. If you want to be able to go back to your original AOA calibration after experimenting, take a firmware backup before you do this.
Also, what kind of airplane is this, and where is the AOA/Pitot mounted?
I have just read the instructions, always handy if all else fails, and am a bit puzzled. It states that " If the AOA alarm is already sounding as air speed falls bellow this(MINSPD) threshold, it will continue to sound until the high AOA condition is resolved."
The full flap stall AOA of my RV7 taildragger would appear to be less than its resting angle. I usually do 3 pointers with the buzzer just sounding at touch down, so short of nipping out and holding the tail up--------.
The full flap stall AOA of my RV7 taildragger would appear to be less than its resting angle. I usually do 3 pointers with the buzzer just sounding at touch down, so short of nipping out and holding the tail up--------.
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I think you just nailed it. The nose-high attitude of your aircraft during taxi looks like high AOA. Unfortunately, we can't think of a method that will shut off the AOA alarm other than to get the airspeed to zero after you land (it shuts off below 15 knots IAS). There isn't a setting that lets you cut the AOA off hard below some certain airspeed.
I tried a couple of stalls yesterday and was not happy with the onset of the buzzer so I tried redoing the stall setting. This time pilot only and attempted some more agressive stalls. Have you ever tried a full power stall with a powerful RV7? I compromised and did some at half power. Anyway the warner now works well, and as you say, on landing it stops at about 15Knots.
Thank you for you help.
The Dynon is a great instrument especially with the new displays.
Thank you for you help.
The Dynon is a great instrument especially with the new displays.
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Great to hear that you got it working to your liking.
GRobertson
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I have the same problem with my RV-8, and researched this forum to see if anyone else has the issue. I understand the situation but would make a suggestion for a future software release: Allow us taildraggers to turn the alarm off unconditionally (even if it is sounding before-hand) when the airspeed falls below a certain value. It is quite annoying to the pilot, and disconcerting to any passengers, to have the alarm sounding as you roll out after an otherwise great 3-point landing.
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GRobertson, that is exactly the feature that is in the software now. You can adjust your MINSPD (minimum speed) to any value you want and there will be no alarm below that.
If you don't have this, make sure you have new-ish software, but we've had that feature in the software for 18 months now.
If you don't have this, make sure you have new-ish software, but we've had that feature in the software for 18 months now.
ArjanPlomp
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Installed the Pitot tube over the weekend and calibrated today. Same problem in our RV-8. The alarm keeps on sounding after landing. As stated by GRobertson, it would be nice if the alarm could somehow turn itself off after landing, but I would honestly not know how this could be accomplished safely. You DO want it to keep on going off, even below minspeed. The only other option I could think off is to have a 'CUTOFFSPEED' option. This speed would have to be set to a lower value than MINSPEED and would always turn the alarm off. Default value should be zero. I would set MINSPEED TO 35knots and CUTOFF to 20knots. I imagine this would be very easy to implement in the software, but it would have to be documented very well because of it's inherit danger of the alarm turning itself off during a true stall.
For now the alarm does not bother me much and the passengers will simply have to get used to it!
I did 5 landings with the AOA installed and that the last 3 landings where definitely much 'shorter field' landings than I have been able to do before! Very happy that the Dynon has an audible alert since there is no time to visually check the EFIS while landing (unlike an other system out there that does not have an audible alert on their simulated/calculated AOA).
For now the alarm does not bother me much and the passengers will simply have to get used to it!
I did 5 landings with the AOA installed and that the last 3 landings where definitely much 'shorter field' landings than I have been able to do before! Very happy that the Dynon has an audible alert since there is no time to visually check the EFIS while landing (unlike an other system out there that does not have an audible alert on their simulated/calculated AOA).
Is there still no way to disable the AOA alarm below a certain airspeed, after it has already been triggered? The use case I'm interested in is after landing, when there's sufficient wind to keep the airspeed indicator above the threshold (15 kts I think). In this case, it yells "stall, stall" in my headset all the way to parking. I currently have the alarm set to "on in red" and the minimum airspeed high enough that I don't hear the alarm on takeoff.
-Rob
-Rob
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We did ad the SETUP>AOAALM>MINSPD to help with this, though there may be some scenarios where the AOA alarm remains at a time that you'd prefer it doesn't. From the manual:
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To reduce nuisance audible AOA alarms – such as when taxiing, taking off and landing – the alarm can be inhibited below a selected airspeed. While in the EFIS > SETUP > AOAALM menu, press MINSPD to configure the minimum airspeed at which an AOA alarm can occur. Anytime airspeed is below the MINSPD value, AOA alarms will not occur; anytime it is above the MINSPD value, alarms can occur. If the AOA alarm is already sounding as airspeed falls below this threshold, it will continue to sound until the high AOA condition is resolved.
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To reduce nuisance audible AOA alarms – such as when taxiing, taking off and landing – the alarm can be inhibited below a selected airspeed. While in the EFIS > SETUP > AOAALM menu, press MINSPD to configure the minimum airspeed at which an AOA alarm can occur. Anytime airspeed is below the MINSPD value, AOA alarms will not occur; anytime it is above the MINSPD value, alarms can occur. If the AOA alarm is already sounding as airspeed falls below this threshold, it will continue to sound until the high AOA condition is resolved.
"If the AOA alarm is already sounding as airspeed falls below this threshold, it will continue to sound until the high AOA condition is resolved. "
This is the problem. Should I not be seeing the AOA in the red when I'm on the ground and there's sufficient wind to keep the airspeed above zero? Curious why the AOA minimum speed isn't the minimum speed in all cases. My minimum is currently set at 35 kts. In all cases, if I'm at or below 35 kts, I'm not flying, so don't want to hear the alarm.
-Rob
This is the problem. Should I not be seeing the AOA in the red when I'm on the ground and there's sufficient wind to keep the airspeed above zero? Curious why the AOA minimum speed isn't the minimum speed in all cases. My minimum is currently set at 35 kts. In all cases, if I'm at or below 35 kts, I'm not flying, so don't want to hear the alarm.
-Rob
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So the reason we did it this way was that we wanted to not discard actual in-flight stall cases where airspeed decays, but where the aircraft IS actually stalled and in the air, such as can be experienced in a deep stall with minimal airspeed (especially possible with cub-like aircraft). So the minimum speed setting is ignored if the alarm was already blaring as the minimum speed threshold is crossed as airspeed decays, but its heeded if airspeed is coming up from zero. This means (as you're finding) that not every nuisance case may be dealt with in every airplane. It was essentially an attempt to minimize nuisance alarms without compromising corner cases which could actually happen in-flight. Most airplanes' AOA indicators essentially go back to yellow/green on the roll-out, but this is aircraft/calibration-specific, and we've only had a a few complaints like yours over the years, so we thought we've had the right balance. So no promises we'll make any changes here, but we'll continue to keep our ears open. Anyone else having this issue?
I found this older thread in my quest to solve my AOA warning / tone problem (and I found other threads too). So I'm hopefully finding I have the same problem with my AOA warning that others have and you can help me resolve it...
Some background: I have an RV-7A with a D100 /120 and HS34. I am not the builder, but have been discussing with the builder trying to solve the issue - he never got around to solving it (sold it to me with 150 hours on it and I've flown it a 100 hours). Pitot tube is placed under wing per standard Vans.
The Problem: when EXT VOICE or TONE is selected, a very loud side-tone/buzz is constantly audible and when the EXT VOICE is selected the "STALL, STALL" is repeated over again no matter if on the ground, or in the air at 150 kts. Only when I select INT EFIS for AOA does it go quiet. The visual green/yellow/red chevrons on the D100 work as they should, and In AOAALM I've got audible on set to TOP of YELLOW and min airspeed set to 35 knots.
My attempts to solve: I have redone the SPDCAL, and re-calibrated the AOA in accordance with the d100 install manual. I've also inputted different configurations into AOAALM (such as audible in red, and different min air speeds). NO change - the side tone and STALL Warning (when EXT VOICE is selected) continues no matter what AOA.
Can you please help with suggestions to solve?
Some background: I have an RV-7A with a D100 /120 and HS34. I am not the builder, but have been discussing with the builder trying to solve the issue - he never got around to solving it (sold it to me with 150 hours on it and I've flown it a 100 hours). Pitot tube is placed under wing per standard Vans.
The Problem: when EXT VOICE or TONE is selected, a very loud side-tone/buzz is constantly audible and when the EXT VOICE is selected the "STALL, STALL" is repeated over again no matter if on the ground, or in the air at 150 kts. Only when I select INT EFIS for AOA does it go quiet. The visual green/yellow/red chevrons on the D100 work as they should, and In AOAALM I've got audible on set to TOP of YELLOW and min airspeed set to 35 knots.
My attempts to solve: I have redone the SPDCAL, and re-calibrated the AOA in accordance with the d100 install manual. I've also inputted different configurations into AOAALM (such as audible in red, and different min air speeds). NO change - the side tone and STALL Warning (when EXT VOICE is selected) continues no matter what AOA.
Can you please help with suggestions to solve?
That is bizarre, and I can't say that anything comes to mind immediately. It sounds like there's only one EFIS in the aircraft, so it doesn't sounds like it's the "other" EFIS in the aircraft.
Also, in normal flight, you should see a full AOA bar with all or most of the red/yellow/green bars filled. If that's not what you're seeing, then you might actually be seeing AOA which the EFIS thinks is always high.
Any chance of seeing a video that shows the whole EFIS displays as AOA/airspeed/attitude is exercised?
Also, in normal flight, you should see a full AOA bar with all or most of the red/yellow/green bars filled. If that's not what you're seeing, then you might actually be seeing AOA which the EFIS thinks is always high.
Any chance of seeing a video that shows the whole EFIS displays as AOA/airspeed/attitude is exercised?
What software version is your EFIS on? Also, when you're getting the constant alert, is the top of the red chevron (the bigger triangular piece) flashing?
This is related to my 28 July (Reply 15) request for help. Please refer to repy 15 through this for background. Sorry for the delay in responding.
To answer your questions - 1) running 5.4.3 software on D100 EFIS
2) I have the red flashing chevron on the ground, but all the chevrons (red/yellow and green) in the air. It doesn't matter if I'm on the ground or in the air, I get the lound tone with EXT TONE and "stall, stall" constantly when e EXT VOICE is selected. The only way to turn it off is select INT EFIS on HSI setup. The chevrons work properly in the air; ie the green, then yellow disappear as I increasd AOA.
I attempted to upload a video, but my technology only includes an iphone which records in .mov. This site will not allow me to upload that type of video. BL - After recal the Speed and AOA, and resetting everything, I get the loud tone/buzz if EXT TONE is selected, and along with the tone/buzz I also get the "stall, stall" warning constantly. It's the same in the air, but with chevrons.
Hopefully you can suggest something.. Otherwise I'm going to get someone to help re-wire the AOA system.
Thanks
Stamp
N74BZ - RV7A
To answer your questions - 1) running 5.4.3 software on D100 EFIS
2) I have the red flashing chevron on the ground, but all the chevrons (red/yellow and green) in the air. It doesn't matter if I'm on the ground or in the air, I get the lound tone with EXT TONE and "stall, stall" constantly when e EXT VOICE is selected. The only way to turn it off is select INT EFIS on HSI setup. The chevrons work properly in the air; ie the green, then yellow disappear as I increasd AOA.
I attempted to upload a video, but my technology only includes an iphone which records in .mov. This site will not allow me to upload that type of video. BL - After recal the Speed and AOA, and resetting everything, I get the loud tone/buzz if EXT TONE is selected, and along with the tone/buzz I also get the "stall, stall" warning constantly. It's the same in the air, but with chevrons.
Hopefully you can suggest something.. Otherwise I'm going to get someone to help re-wire the AOA system.
Thanks
Stamp
N74BZ - RV7A