Originally Posted by
yoko1
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Unfortunately, all of this detail still does not tell us what happens if the FCC does not correctly process the MAIN ELEC TRIM INTLK signal.
Both the Main and Automatic trim signals are sent to the stab trim motor Controller. I could find no information regarding this component, which again, I am told is housed within the motor assembly itself. The motor is made by Eaton and is similar to the one on the 737NG. If a malfunction in the FCC allows simultaneous signals from the Automatic and Main Electric trim to arrive at the Controller, then that might explain the reported test results - just speculating here.
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This is correct. Everything happening within the assembly of the Eaton motor will not be in the wiring diagrams. One would have to look in the technical customer manual of that device.