Originally Posted by
Super VC-10
So, as I suspected, something was wired incorrectly. Which brings us back to the question I asked earlier.
With the incorrect wiring, would the display show what had been asked for, or what was actually happening?
mjv seems to answer your question here - actual spoiler position is sensed.
... which handle the spoiler pairs FCU 1 Channel A does the spoilers 1 on both sides and B does the 2’s on both sides.
...
feedback is done by LVDT’s for controlling and indication. Only the ground spoilers come with old fashion targets as they are either out or in.
LVDT are position sensors. Linear Variable Differential Transformer. Produce a changing AC voltage depending on the sensed position.