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A comment on Cockpit voice recorder of Lion Air jet depicts pilots' frantic search for fix. Parent comment

Re:Cockpit voice recorder of Lion Air jet depicts pilots' fr... by VBprogrammer on Wednesday March 20, 2019 @08:08AM (#19441238)
A potentiometer (or something fancier) directly attached to the stabilizer would do it. I'm not sure if they do have one or not. They rate of movement on the stab trim is different depending on the source of the trim change so it's possible they have a PWM controller with some feedback.
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Re:Cockpit voice recorder of Lion Air jet depicts pilots' fr... by fgonzag on Wednesday March 20, 2019 @03:35PM (#19445976)
Or just use an angle sensor on the control surfaces? You now have two measurements: What the computer is telling the hardware to set the angle to, what the angle actually is.

These two are very different but very important pieces of information.

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