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Old 05-15-2022, 01:59 PM
KGT KGT is offline
Join Date: Feb 2018
Location: Rosemount MN
Posts: 32
Default FightDek 180 autopilot install won't work!

I recently installed new Dynon autopilot servos in my RV8 with a FlightDek 180 that I've used for 10 years. I ran the wires myself and am very confident it is wired correctly. The problem is the D180 doesn't recognize the servos. I was initially able to complete the set up process and everything appeared to work.

I went for a test flight and the autopilot worked for about 10 minutes then showed err message for both sevos as if power to the servos was turned off. However there is power to the servos. I did experience this same problem during initial setup but was able to finally get it to work. I checked continuity in the DSAB wires to the servo and they are good. I sent the FlightDek 180 in for the latest software update before the installation because they need the latest software to work with the new servos.

I'm out of ideas other than to send D180 or servos back to see if they can find anything. Dynon just had it last week I was hoping it would work since it was just updated!

Any suggestions would be appreciated. If I can't resolve this issue I may have new Dynon autopilot servos (SV32) and a used D180 for sale!

RV-8 Flying since 2012

Last edited by KGT : 05-15-2022 at 04:37 PM.
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Old 05-15-2022, 08:31 PM
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Carlos151 Carlos151 is offline
Join Date: Jan 2008
Location: Lebanon, TN
Posts: 484

Just curious why you “sent in” your D180 for a software update? Dynon is pretty clear that you need to have ALL items on the DSAB bus connected and powered up at the same time for a software update. That includes servos, HS34, AP74, OAT sensor, heated pitot tube or any other Dynon items you may have. You can do the software update with a simple serial to USB cable connector. Looks to me like you may not have the same software operating on all of your Dynon equipment.
Take a look at chapter 7 and 8 of the Dynon installation guide. This may solve your problems.

“To ensure reliable operation, all Dynon devices should be upgraded to the same version of firmware; mismatched versions of firmware on different devices can cause unreliable operation.”
Karl Richcreek
RV-8 N151TK "La Otra Chica"
Flying as of August 14, 2015
RV-15 N302TK "La Proxima Chica"

Last edited by Carlos151 : 05-15-2022 at 09:26 PM.
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Old 05-16-2022, 04:11 AM
KGT KGT is offline
Join Date: Feb 2018
Location: Rosemount MN
Posts: 32
Default Dynon recommended update

Thanks for the reply. I spoke with Dynon prior to the installation I was told to update the D180. The new servos and the D180 theoretically have the same update version. I’ve read the installation manual as well and understand that part and went by Dynon’s recommendation.
RV-8 Flying since 2012
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Old 05-16-2022, 05:17 AM
drill_and_buck's Avatar
drill_and_buck drill_and_buck is offline
Join Date: Feb 2005
Location: Bridgewater, MA - KPYM
Posts: 501

Kevin, FWIW, passing along my experience with AP failure after firmware upgrade.... D-100 / D-120 with 400 hours of successful AP operations.

Last year I updated the firmware to all devices on the DSAB and tested the Autopilot in flight. It worked perfectly. When I went to restart the plane after landing, I got a DSAB error. The roll servo was no longer in the network. I tried several attempts to discover it without success.

An interesting point is that the Dynon Support Utility could discover the servo *and* update it's firmware. After the servo failure I updated the firmware once again. However, even after updating the firmware, I couldn't discover the servo from the Dynon AP menu to add it back into the network. Had to send the servo back to Dynon for repair. Received a new servo, AP now working as advertised.
Mike Draper
RV-8 N468RV
First Flight 11/13/2011
TMX0360, Dual Pmags, CS
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Old 05-16-2022, 05:18 AM
s24789 s24789 is offline
Join Date: Jan 2009
Location: Hobe Sound, Florida
Posts: 309

We had an issue originally where the servos were not recognized by the bus master. Got new servos and all worked well. Explained the situation to Dynon and they replaced the servos.
Kevin Phelps
Paid thru Dec 2022
RV-7A flying N782WP
Stuart, Fl
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Old 05-16-2022, 09:43 AM
KGT KGT is offline
Join Date: Feb 2018
Location: Rosemount MN
Posts: 32

Thanks all for the info! I purchased the servos recently from Aircraft Spruce maybe not the most recent update on them.

RV-8 Flying since 2012
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Old 05-16-2022, 01:15 PM
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rondawes rondawes is offline
Join Date: Mar 2016
Location: Wylie, TX
Posts: 107

Do you have an AP74? it has to have the same firmware as the D180. The servos have to have the same firmware as the D180. The latest version for the D180 is 5.6.1. You can connect your D180 to a PC and see the versions of all devices in the network and update them if needed.

You got the servos from AS so maybe they come with firmware for the Skyview series installed since that's the current model series Dynon sells? The Skyview uses a 4 wire network and the D180 the 2 wire DSAB network. The servos support both from a wiring perspective but I don't know if they have different firmware. I'd kind of bet they do.
Based KTKI
Donation paid July 2022
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