IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM

Print Page | Close Window

Erroneous Terrain Warnings

Printed From: Avidyne
Category: Avidyne General
Forum Name: IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM
Forum Description: Topics on Avidyne's IFD 5 Series and IFD 4 Series Touch Screen GPS/NAV/COM
URL: http://forums.avidyne.com/forum_posts.asp?TID=2186
Printed Date: 24 Apr 2024 at 10:06pm
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com

Topic: Erroneous Terrain Warnings

Posted By: kjmorris2023
Subject: Erroneous Terrain Warnings
Date 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

Replies:

Posted By: AviSteve
Date 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

Posted By: birddog486
Date 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

Posted By: safari
Date 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

Posted By: kjmorris2023
Date Posted: 03 May 2021 at 1:25pm

They haven't got back to me. I uploaded a bunch of logs also.

Posted By: birddog486
Date Posted: 14 Jul 2021 at 10:00pm

Did you ever get a reply from Avidyne?