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Caution Underspeed

Printed From: Avidyne
Category: Avidyne General
Forum Name: DFC90/DFC100 Digital Autopilot
Forum Description: Topics on the Avidyne DFC Digital Autopilots
URL: http://forums.avidyne.com/forum_posts.asp?TID=1210
Printed Date: 19 Jan 2018 at 10:24am


Topic: Caution Underspeed
Posted By: jimmyz80
Subject: Caution Underspeed
Date Posted: 28 Jan 2017 at 6:38pm
Ever since i had my DFC90 installed, I've been getting super annoying "Caution, Underspeed" warnings on landing rollout.  So you're rolling down the runway listening for exit instructions from the tower, and the DFC is bitching and complaining that I'm going too slow. :)

I assume this doesn't happen to everyone, or it would be a much bigger deal.  Any ideas as to why this would be happening?


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2006 Cirrus SR22 - IFD540 IFD440 DFC90 AXP322 MLB100



Replies:
Posted By: Melohn
Date Posted: 29 Jan 2017 at 2:14am
Assuming you have a Cirrus, you are hearing this because your flap switch is not connected to the DFC90, so it assumes that you are flying with flaps up.

You have two choices; have the flap switch connected to the DFC90, or always use the autopilot disconnect when operating at speeds below ~80 knots; you won't hear the caution when the autopilot is in AP READY state.



Posted By: jimmyz80
Date Posted: 29 Jan 2017 at 1:30pm
The flap switch is properly connected, since I get the appropriate flap overspeed warnings.

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2006 Cirrus SR22 - IFD540 IFD440 DFC90 AXP322 MLB100



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