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I'm working with a Shadin 2000 air data computer interfaced via ARINC 429 to an Avidyne IFD 550. For some reason, the airspeed tape is flipping between discreet values, and not gradually increasing/decreasing. This makes the readout appear very ratchety or jumpy.

I'm by no means an expert on troubleshooting these kinds of problems. What could be causing this?

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  • $\begingroup$ Check the message format expected by the 550. Verify That the 2000 is encoding in that format and verify that the expected data is being sent. You’ll need a bus analyzer. $\endgroup$
    – Jim
    May 17, 2022 at 16:03
  • $\begingroup$ I don’t see the 2000 on this list: pilotsupport.avidyne.com/kb/article/… $\endgroup$
    – Jim
    May 17, 2022 at 16:06
  • $\begingroup$ Interesting- the configuration setting for it is shown in the Installation Manual: imgur.com/a/KVT7DM4 $\endgroup$ May 17, 2022 at 16:31
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    $\begingroup$ Well, good. I wouldn’t trust info you randomly find on the internet ;-) $\endgroup$
    – Jim
    May 17, 2022 at 16:32

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Not sure what rate the IFD 550 expects the transmit rate to be, but from what I can find on the Shadin 2000, it's label transmit rate is configured by a switch position and can vary from 50,100, or 200 ms, which longer periods could cause a jumpy display if it isn't filtering the received label at all.

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