Horizontal Stabilizer Trim Actuators (HSTAs), Horizontal Stabilizer
Trim Systems (HSTSs), Trimmable Horizontal Stabilizer Actuators (THSAs)
Dual structural load path ballscrew actuator
Dual and triple electric motors driven ballscrew
Torque summing and Speed summing differential gearbox designs
Integrated Dual channel Servo Control Electronics
Closed-loop rate control processed within Electronic Control
Module
Bi-directional skewed roller no-back
brake
Innovative spring energized, triggered locked, primary load
path failure detection with in-situ inspection feature
Fail locked safety tie rod with rotational lock
Integrated dual position feedback / monitoring sensors
Integrated skewed roller inertia dump clutch for overload
protection
Built-in-test (BIT) feedback to the cockpit provides complete
system status to the pilot on demand
FAR 25 certified
