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This panel was used on McDonnell Douglas DC-9. It was placed on the Upper left-hand side of the Forward Control Pedestal. If you wish to see it click here. Then click on the picture and it is item 1 in the photo. Lucky the analysis will be very quick, as the schematic is on the units bottom plate. So the Analysis: Panel inner and outer control are both 10 position rotary switches. The Red Control is an 8 position rotary switch coupled to a transformer. The Third Control is marked White, and are ...