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Marlins Web Site
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Date: 4-24-2017
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Number of Hours: 15.00
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Manual Reference: Electrical Systems
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Brief Description: Completed TruTrack DigiFlight Autopilot Wiring
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I spent the last three days wiring the TruTrack DigiFlight IIVSGV Autopilot and integrating the GNS 430W Com/Nav and Grand Rapids Technologies (GRT) HX EFIS. I had two big challenges that took some time to fix. The first was, two years ago, I pulled the wrong size wires from both the elevator and aileron autopilot servos for ground and power. So, to remedy this I had to pull new wires from the servos to the TruTrack DigiFlight Harness and Main Bus. To complicate matters, I also thought the elevator and aileron trim servos controlled by the pilot and co-pilot stick grip hat-buttons were integrated into the autopilot. As a result, I had originally tied the autopilot power and all the servos into the same circuits. When I started doing the final connections, I realized I had to power the big autopilot servos and autopilot computer separately from the trim servos; and install an SPST switch to turn the autopilot and its servos on/off independently from the trim servos. Additionally, there is a stick grip index finger button on both the pilot and co-pilot grips that “engage/disengage” the autopilot once it’s turned on. It makes good sense to me to have a separate on/off switch because you don’t want to inadvertently engage the autopilot by accidently pushing the index finger button. So, the way it’s set up now, I first turn on the autopilot, then when I have the airplane pointed in the correct direction and configuration, I push the engage button on the stick grip.
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FAA pic to let them know I'm doing all of this
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Autopilot Harness nearly done
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Autopilot ON/OFF and NAV Signal ON/ON Switch
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