Abstract: A control servo for an aircraft engine control system, the control servo broadly comprising a housing, a stepper motor, a drivetrain, an output shaft, and an output lever. The housing includes a drivetrain chamber, a drive opening, and an output opening. The stepper motor includes a drive shaft extending through the drive opening into the drivetrain chamber. The drivetrain is at least partially positioned in the drivetrain chamber. The output shaft extends through the output opening from the drivetrain chamber. The drivetrain drivably connects the drive shaft and output shaft. The output lever includes an output lever arm and a friction interface. The output lever arm has opposing proximal and distal ends and is connected to the output shaft near the proximal end. The friction interface is near the proximal end and configured to be adjusted to set a slip friction threshold between the output lever and the output shaft.