DFC90/DFC100 Digital Autopilot

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DFC90+430W=VNAV?

Printed From: Avidyne
Category: Avidyne General
Forum Name: DFC90/DFC100 Digital Autopilot
Forum Description: Topics on the Avidyne DFC Digital Autopilots
URL: https://avidynelive.com/forum_posts.asp?TID=869
Printed Date: 26 Mar 2026 at 2:07pm
Software Version: Web Wiz Forums 12.07 - https://www.webwizforums.com

Topic: DFC90+430W=VNAV?

Posted By: rsaleur
Subject: DFC90+430W=VNAV?
Date Posted: 08 Nov 2015 at 2:10am

I just bought a G2 SR22 Cirrus with Garmin 430 and STEC. I am contemplating upgrading to DFC90 A/P (which I had on my SR20 previous A/C) and 2x430W.

Will my A/C be able to fly VNAC and LPV approaches with this multiple upgrade of both the GPS and the A/P? My PFD is Adydine 8.0.3.

Best

Replies:

Posted By: Gring
Date Posted: 08 Nov 2015 at 4:09am

Yes. Your original 430 non WAAS and STEC 55 could also fly LNAV approaches (No +V), so the DFC90 will be able to do the same. The WAAS upgrade will get you vertical guidance on GPS approaches, namely LNAV+v, LNAV/VNAV, LP+V, and LPV approaches with either the STEC 55 or the DFC90. The DFC90 adds the ability to do Indicated Airspeed Climbs, straight and level, envelope protection, and is a much better autopilot for tracking.

Posted By: rsaleur
Date Posted: 08 Nov 2015 at 5:26am

Thanks Gring for your advice. I read that I must also upgrade my PFD from 8.0.3 to 8.0.5 in order to be able to fly those GPS approaches with vertical guidance. Do you confirm?

Posted By: Gring
Date Posted: 08 Nov 2015 at 7:22am

I cannot confirm any of the Entegra software releases, you'll need to talk with tech support on that one.