IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM - Silencing repeated terrain warnings

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Silencing repeated 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=1949
Printed Date: 19 May 2024 at 1:45am
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com

Topic: Silencing repeated terrain warnings

Posted By: ttvetdoc
Subject: Silencing repeated terrain warnings
Date Posted: 03 Mar 2020 at 3:29pm

I have twice now flown into private mountainous airstrips and been bombarded with 'terrain, pull up' warnings as I'm approaching the airport and when on final. These airstrips are not in the database so the navigator has no idea I'm trying to land on an actual runway and thinks I'm trying to fly the plane into the ground with mountains all around me. I block out the warnings but they are very distracting during challenging approaches. I can hit 'clear' on my IFD440 but it comes right back. Is there an easy way to silence these repeated aural warnings or do I just have to remember to turn them off in the settings prior to launching to one of these airstrips in the future?

Thanks

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SR22 - KEQY

Replies:

Posted By: forkauto
Date Posted: 03 Mar 2020 at 3:31pm

Turn the aural alerts off in the setup menu or turn the alerts volume down in menu

Posted By: AviSteve
Date Posted: 03 Mar 2020 at 4:04pm

See page 3-50 of the IFD500 series pilot guide (2-43 in the 400 series PG). It describes how to designate a user waypoint as an airport. It's a little hokey, but that feature was included specifically to address this situation. Put that waypoint in your flight plan and the warnings should go away.

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Steve Lindsley
Avidyne Engineering

Posted By: Gring
Date Posted: 03 Mar 2020 at 5:51pm

Steve, I am working on a panel update and have a Mid Continent MD41 TAWS annunciation with an inhibit button. Looking at the install manual, it looks like there are outputs for the Terrain Alert and Pull UP annunciation as well as an input to inhibit TAWS. Can you confirm that these are indeed operational in the latest software?

Posted By: brou0040
Date Posted: 03 Mar 2020 at 9:02pm

Gring wrote:

Steve, I am working on a panel update and have a Mid Continent MD41 TAWS annunciation with an inhibit button. Looking at the install manual, it looks like there are outputs for the Terrain Alert and Pull UP annunciation as well as an input to inhibit TAWS. Can you confirm that these are indeed operational in the latest software?

TAWS inhibit works already (may have always worked as far as I know), I can't say what the pinout being used, but I have a "FLTA Inhibit" switch on my panel. Designating a waypoint as an airport may not be enough. There are airports in the database, such as L05, where I always get terrain alerts going in. Just be sure to add enable FLTA to your checklist so you don't accidentally leave the switch turned off. The switch is much easier than going into the settings. I don't like to scare passengers and there are certain passes where I know it'll go off every time so I enable it through the pass and enable on the other side with the flick of a switch.

Posted By: Bob H
Date Posted: 03 Mar 2020 at 9:23pm

ttvetdoc wrote:

I have twice now flown into private mountainous airstrips and been bombarded with 'terrain, pull up' warnings as I'm approaching the airport and when on final. These airstrips are not in the database so the navigator has no idea I'm trying to land on an actual runway and thinks I'm trying to fly the plane into the ground with mountains all around me. I block out the warnings but they are very distracting during challenging approaches. I can hit 'clear' on my IFD440 but it comes right back. Is there an easy way to silence these repeated aural warnings or do I just have to remember to turn them off in the settings prior to launching to one of these airstrips in the future?

What Steve said. I fly an amphib so get this warning all the time. I just add a user designated airport for my planned landing area and all the warnings stop. I never considered it as hokey though. It works quite well. I also keep the volume low for those times when I've not been able to program ahead of time. Some folks recommend adding a switched input to the audio panel. However, I don't think that's a good idea for such a critical safety feature.

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Bob

Posted By: ttvetdoc
Date Posted: 04 Mar 2020 at 8:28am

AviSteve wrote:

See page 3-50 of the IFD500 series pilot guide (2-43 in the 400 series PG). It describes how to designate a user waypoint as an airport. It's a little hokey, but that feature was included specifically to address this situation. Put that waypoint in your flight plan and the warnings should go away.

Excellent - exactly what I was looking for!

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SR22 - KEQY

Posted By: AviSteve
Date Posted: 04 Mar 2020 at 11:57am

I asked the responsible engineer and he says... "Yes, there are discrete inputs & outputs and yes they work when wired to an MD41." His recollection is that it has been there since around 10.2.0

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Steve Lindsley
Avidyne Engineering

Posted By: Gring
Date Posted: 04 Mar 2020 at 1:57pm

Great, thanks. I thought so based on the pinout. When I was working with the precertified software, it wasn't yet operational and couldn't remember hearing the status.