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DFC Disconnects
Thank you for your reply and additional information. The most common cause of erratic DFC operation is the Start Voltages of the Roll and Pitch Trim Motors. A good Motor will begin to respond at around 2 Volts. Any voltage beyond 2.5 volts will cause erratic operation of the autopilot. The autopilot is also …
DFC90 Self Test Fail
If you get a self test fail annunciation please have the following completed by an Avidyne dealer. 1. Verify Autopilot is properly seated in its tray. 2. Verify no Autopilot external devices has failed (i.e. trim/servo motors, turn coordinator, autopilot disconnect, trim/servo motor, etc.) If the above reaso…
Audio Fail message on R9 IFD5000
This is an indication that is generated by the DFC100 autopilot computer. Essentially this fault means the DFC100 is unable to read/write to an internal memory component. This will not affect any of the operation of the auto pilot, but will cause the aural alerting to cease. The unit will need to come back to Avid…
DFC90/100 Servo Start Up Voltages - Cirrus and Piper
This should be tested using a variable DC power supply, connected as displayed in the image below: Once connected, begin at 0VDC and slowly increase voltage until the servo begins to respond. That will be your "start-up voltage." DFC90 Servo Start Up Voltages Roll Servo should be less than 3VDC Pitch Servo…
DFC90 Autopilot Disconnects
The DFC-90 requires Aircraft Power to be supplied to "A/P Disconnect" P1-17 and "Trim Interrupt " P2-14. If either input is missing the Autopilot will Disengage. The most common cause of DFC-90 problems is the connector mating into the old S-Tec 55x Tray. Insure that the unit is securely seated into the rack. …
