Adams Rite Aerospace produces custom engineered speed brakes for commercial aircraft.  This system is electrically interlocked through the landing gear so that after touchdown the servo actuators are energized to deploy the speed brakes. Actuator is locked and drives the output with no manual override. The output will not backdrive the input. 
Pilot input uncouples the actuator input from the output. 
Incorporates friction drag to provide artificial feel in the pilot’s control lever

Platforms
B737 / 747