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08-21-2012, 09:54 PM
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Join Date: Jun 2005
Location: Woodinville, WA
Posts: 1,499
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Or use your cross-checking skills. If one shows a huge bank but neither shows your heading changing, the bank is probably wrong. If one shows you at zero airspeed, that one is wrong. If your GPS altitude is 8,000' and one shows 7,800' and the other shows 18,800', the higher one is wrong.
Ultimately, that's no different than what you would do if you were in the soup and had one brand X EFIS and one brand Y EFIS and they disagreed. You have to use your brain to decide what is likely right. the advantage here is the system is helping you cross-check constantly so you see as early as possible that one of your systems is failing. Also, it prevents you from going into the soup with a problem.
If you really want to install 3 AHRS modules, then you can use them to vote out the broken one (no, not automatically).
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08-22-2012, 04:10 AM
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Join Date: Aug 2009
Location: Goodyear, Arizona
Posts: 877
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All this talk about ADAHRS cross checking has me wondering (and worried?) I opted to get only one Skyview ADAHRS with my dual Skyview displays since there is a totally separate ADAHRS in my Dynon D6 which I use as an independent backup attitude source.
1. How often do the Skyview ADAHRS units get errors that could affect safety of flight, especially in the weather? I am looking for empirical track record data from Dynon Support, if any exists. Anecdotal evidence from single end users is appreciated, but lacks sufficient sample size to be significant.
2. Should I have purchased a second ADAHRS for my fully IFR capable aircraft, even though I have a separate ADAHRS in my D6?
__________________
Karl, Goodyear, Arizona (KGYR) ATP, CFII
RV-14A, Flying
Extra 330LX, Flying
RV-8, Sold
RV-7, Sold
Bearhawk 4-Place, Sold
=VAF= donor 2020
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08-22-2012, 05:02 AM
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Join Date: Apr 2012
Location: Collierville, TN (KFYE)
Posts: 1,433
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Quote:
Originally Posted by dynonsupport
The user gets a warning that says "AHRS CROSS-CHECK ERROR: PITCH". They can then press a button, which will display both AHRS solutions side by side. The user can press "disable" on the AHRS that they no longer want in the system.
You cannot set the disagreement ranges yourself. We have chosen values that we believe are reasonable to catch AHRS units that are in serious disagreement without giving nuisance alarms. Each term (G-meter, pitch, roll, heading, airspeed, etc) has a different difference based on our data. There is more processing going on as well besides just simple differences.
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Can you pull up both ahrs data manually? For preflight, I'd like to know what both units are thinking and then later during flight, I'd like to be able to check them against each other myself.
__________________
RV-8 #81077 Super Slow Build
Dynon Skyview HDX, Titan IOX-370, Dual P-Mags, AFP FM200A FI, Whirlwind 200RV CS Prop
First Flight 11/20/2016
www.marksrv8.com
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08-22-2012, 06:51 AM
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Join Date: Jul 2010
Location: Marietta, GA (KCZL)
Posts: 308
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Hooray! Thank you for this update Dynon. Looks good.
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Brian Unrein
RV10 N42BU 900+ hours!
First flight 6-16-12
https://N42BU.com
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08-22-2012, 07:52 AM
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Join Date: Dec 2008
Location: Glendale, AZ
Posts: 65
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Sectional?
Looks like a WAC chart to me.
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Jason Krause
RV-7 SB Finish Kit
Flying other people's stuff RV-9, Kit Fox.....
www.JDair.com
RV accessories including TailWheel Steering Links,
Upgraded Tailwheel Forks and Rudder Pedal Extensions.
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08-22-2012, 08:22 AM
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Join Date: Jun 2005
Location: Woodinville, WA
Posts: 1,499
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Quote:
Originally Posted by Mark Dickens
Can you pull up both ahrs data manually?
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Yes, you can pull them up manually as well.
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08-22-2012, 08:33 AM
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Join Date: Jun 2005
Location: Woodinville, WA
Posts: 1,499
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Quote:
Originally Posted by Juvat
All this talk about ADAHRS cross checking has me wondering (and worried?) I opted to get only one Skyview ADAHRS with my dual Skyview displays since there is a totally separate ADAHRS in my Dynon D6 which I use as an independent backup attitude source.
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As we always tell people, if you fly IFR, you need a backup. There are lots of ways to accomplish this, and the Dynon D6 is a great one.
We implemented AHRS cross-checking in SkyView not because AHRS units fail often, but because it's the right thing to do for pilot workload reduction. In fact, as far as I can remember, we've never had a SkyView AHRS module fail in flight, although I have not done a detailed review of all of our AHRS returns. Cross-checking is not valuable just in flight, but even when you first boot up. If the AHRS has failed, you'll get a warning even before you take off. It's just a good way to ensure that your system is solid and ready to go. Plus, it's something our customers have been asking for.
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08-22-2012, 10:58 AM
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Join Date: Aug 2009
Location: Goodyear, Arizona
Posts: 877
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Thanks for the reply. I didn't think there would be many ADAHRS failures due to the lack of moving parts. I will rest easy with my single Skyview ADAHRS and separate D6 ADAHRS then. 
__________________
Karl, Goodyear, Arizona (KGYR) ATP, CFII
RV-14A, Flying
Extra 330LX, Flying
RV-8, Sold
RV-7, Sold
Bearhawk 4-Place, Sold
=VAF= donor 2020
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08-22-2012, 12:05 PM
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Join Date: Jan 2005
Posts: 626
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I thought I read somewhere recently that I will need to buy the GPS Navigation Software SV-MAP-270 Module for a one-time $500 fee before I can take advantage of SkyView 4.0. Is this true?
I am still in my 30-hour trial and want to hold off a bit longer before having to spend the money. Should I wait to install version 4.0 until then?
Thanks!
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08-22-2012, 12:54 PM
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Join Date: Jun 2005
Location: Woodinville, WA
Posts: 1,499
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There is no difference between previous versions and 4.0 in needing the map certificate. If you are in your 30 hour trial or have SV-MAP-270 installed, you get all the mapping features, including the new ones. Upgrading will not expire your 30 flight hour timer nor reset it.
Without the map software, you will not see airports, airspaces, cities, roads, or anything else on the map page. The only thing present will be the terrain.
I believe what you likely read is that the basemap features require the SV-MAP-270 option to be used, and that is true, but the trial counts as having that option while the trial is active.
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