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

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my ap won't fly this approach

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=2346
Printed Date: 28 Jun 2024 at 11:31pm
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com

Topic: my ap won't fly this approach

Posted By: nhflydoc
Subject: my ap won't fly this approach
Date Posted: 24 Mar 2022 at 4:50pm

RNAV 32 KIZG LPV

I have a trutrack AP and Avidyne 440.

I have flown other LPV approaches with no issue but on this one my AP flags the GS and levels off at 2200 feet. I get a GS indication on my PFD but the AP will not capture it and I have to disconnect and hand fly it.

Any ideas?

It seems the GS loads late on this approach.

Alan

Replies:

Posted By: rolfe_tessem
Date Posted: 26 Mar 2022 at 9:24am

Where on the approach are you trying to activate approach mode (or whatever they call it on your AP)?

I have a local approach where I have to descend to the first stepdown on my own -- the approach doesn't activate until the second one. If I activate approach mode on my 55X too early, the AP will try to chase the (non existent) GS above me.

Rolfe

Posted By: nhflydoc
Date Posted: 26 Mar 2022 at 12:40pm

What I found is when the LPV GS comes alive It shows me 1 dot high and that is not enough time to arm the AP so it shows FLG. If you look at the RNAV 32 approach you see you are supposed to be at 3100.well at the altitude when the GS shows its too late to arm the AP.

If I fly VTF I get a GS at the IAF

Alan

Posted By: nhflydoc
Date Posted: 26 Mar 2022 at 8:56pm

see video

https://share.icloud.com/photos/0bdmhhqSYpsP9R7ZbLbXkzSuQ