Originally Posted by
MemberBerry
Well, the trim schematic shows the thumb switch outputs for "up" and "down" connected together, and there are direct connections that go to the DFDAU (Digital Flight Data Acquisition Unit). This strongly suggests that the FDR traces are based on the actual position of the switches. I took a section of the schematic and colored in green and turquoise the paths of the signal from thumb switches to the DFDAU:
Sorry, a dumb question but electric circuits are a black art to me. I've seen this, or a similar diagram before, and am aware of all the comments that the two switches now peform an identical function. If that is the case, what is the function of the circuit 8 - 9 in the S272 Stab Trim Cutout Switch?
Thanks
Alchad