![][1] ![][2] ![][3] ![][4] ![][5] ![][6] **__NOTE: The Diodes and Resistors called out on the Flap Interface Drawing Are NOT included in the installation kit from Avidyne.__** ...
The following is a theory of operation of the pitch/pitch-trim system. The attached drawing will help, and it is advised to opening the drawings while reading through the paragraphs below. The lines highlighted in blue are grounds, and the lines highlighted in yellow are bus voltage (28V). **_Pitch Down Trim Rela...
The DFC 90 uses 4 criteria to set the self-test failure bit. 1. Servo Fail - Compares expected current and voltage draws of the servos to the actual current and voltage draws of the servos. If the measured value is out of tolerance, the servo fail bit is asserted. (The measured servo readings must be within 500m...
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. ...
This should be tested using a variable DC power supply, connected as displayed in the image below: ![][1] 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...
1. Power up the PFD and wait until the airspeed and altitude tapes are shown. 2. Enter system setup by simultaneously pressing and holding the top left (L1) and third down from the left top (L3) Line Select Keys until the countdown timer in the lower left corner of the display indicates zero. 3. Use the left kn...
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 reas...
The PFD Field Level Troubleshooting Guide P/N 600-00722-000 Rev 00 references ADAHRS Miscompare for a Dual PFD configuration. If you have a single PFD and a DFC90; refer to the DFC90 Install Manual 600-00251-000 Rev: 09 or later. Single PFD with a DFC90: Check the blind turn coordinator, the DFC90 is using this to co...
* With the aircraft in straight and level flight (hand flying) using the hat switch, roll the trim full left. Let go of the stick and count how long the aircraft takes to roll to the 45dg mark on the PFD (typically 3-5 secs). * Conduct the same test to the right. With the aircraft straight and level using the ...
Straight and Level - Pressing the "Straight and Level" button on the autopilot will result in a zero bank, +2 degree pitch angle attitude. It is not an altitude hold or a zero vertical speed mode, nor does it hold a heading. Depending on the power setting and aircraft configuration, this could produce a climb, steady...