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Erroneous Terrain Warnings

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kjmorris2023 View Drop Down
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    Posted: 19 Apr 2021 at 1:20pm
We've had our Bonanza back from Avionics Upgrade for about 3 months.  We have an IFD-440 integrated with Dynon glass.  My partners and I love the Terrain Features of the Avidyne and have extensive experience with EGPWS with the Airlines.  When I've tested the system by pointing it at small mountain I have gotten the caution terrain as advertised.  Never pointed it long enough to get the Pull-up warning.  Not that brave or stupid as one might gather.  But now we've gotten two erroneous terrain warnings.  One was on a base turn to Chandler Airport KCHD Right base 22R VFR pointed at the SanTan Range (SanTan's are about 7-8 miles Southeast about 3100 MSL Peak).  I was probably about 1800-1900'MSL.

The other incident happened a couple days ago with my partner VFR into Cottonwood (P52) on a long final into runway 32 where he was high on final.  Both included the pull-up.  At night or IMC were trained to not question and immediately take action for obvious reasons.  Can I get some clarity on why this might have occurred?  Have you seen this on other aircraft?  Can you talk about the algorithm?

Thank you,

Kenneth Morris
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AviSteve View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AviSteve Quote  Post ReplyReply Direct Link To This Post Posted: 19 Apr 2021 at 9:35pm
I'll have tech support contact you so that you'll have a place to send logs.  We'll take a look at them and get back with you regarding why the warnings triggered.
Steve Lindsley
Avidyne Engineering
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birddog486 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote birddog486 Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 2021 at 12:53pm
Let us know what they come up with. I get this warning often flying into small airports which is really annoying
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safari View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote safari Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 2021 at 3:17pm
I get the terrain warning every time I fly in to Sedona unless I am on the gps approach. I just figured it was because there are rocks all around not that far away but it is very annoying.
Dave
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kjmorris2023 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kjmorris2023 Quote  Post ReplyReply Direct Link To This Post Posted: 03 May 2021 at 1:25pm
They haven't got back to me.  I uploaded a bunch of logs also.
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