June 5, 20188 yr What these two switches for? I know that ECU stands for Engine Control Unit but I have no idea what these are used for!
June 10, 20187 yr Basically the switch switches between the two ECU systems for checking during the run-up. Think of them as the Mag Check (1 and 2 - On/ Off - watch for the rev drop) In flight the DA-42 will switch if the ECU 1 fails to ECU 2 so it parts company with the Mag similarity at that point. More info here: https://www.euroga.org/forums/report-on-the-double-ecu-fail-message-i-had-the-other-day-da40ng/7148?page=1
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