NotarPilot Posted March 16, 2019 Report Share Posted March 16, 2019 While flying today I began experiencing a new problem with one of my two IFD 440s. The bottom unit began transmitting intermittently on its own, sometimes a bit rapidly. At one point the problem unit seemed to shut down the radio and an annunciation said “TX stuck open” on the screen.My audio panel was set to transmit on the top unit so I don’t think it’s the wiring or the TX switch on the yoke as the switch is only about 3 years old.I want to do some troubleshooting so I want to swap the units to see if the problem follows the unit or stays on the bottom tray. Does anyone know what size Allen wrench is needed to unscrew the unit.Second, would there be any problems by swapping the units when one is Bluetooth capable while the other is not.Has anyone else experienced this problem?I have an email in to Avidyne but doubt they will get to it til Monday. Thanks Steve Quote Link to comment Share on other sites More sharing options...
LANCECASPER Posted March 16, 2019 Report Share Posted March 16, 2019 1 hour ago, NotarPilot said: I want to do some troubleshooting so I want to swap the units to see if the problem follows the unit or stays on the bottom tray. Does anyone know what size Allen wrench is needed to unscrew the unit. 3/32" https://avidyne.com/files/downloads/600-00316-000.pdf Quote Link to comment Share on other sites More sharing options...
NotarPilot Posted March 16, 2019 Author Report Share Posted March 16, 2019 Thanks Lance. Quote Link to comment Share on other sites More sharing options...
m20kmooney Posted March 16, 2019 Report Share Posted March 16, 2019 (edited) 6 hours ago, NotarPilot said: While flying today I began experiencing a new problem with one of my two IFD 440s There have been comm issues with avidynes. Some think it may be due to old wiring and/or tray that are retained. The fit of the IFD is a little different than the original GNS. Edited March 16, 2019 by m20kmooney 1 Quote Link to comment Share on other sites More sharing options...
thinwing Posted March 18, 2019 Report Share Posted March 18, 2019 Transmit pin shorting to ground Quote Link to comment Share on other sites More sharing options...
NotarPilot Posted March 18, 2019 Author Report Share Posted March 18, 2019 Thanks, I'll have this looked at. Quote Link to comment Share on other sites More sharing options...
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