HSCU Normal Control Mode

The HSTS provides electrical and mechanical control of the stabilizer, fault monitoring and annunciation.

The three main components are: Horizontal Stabilizer Control Unit (HSCU), Horizontal Stabilizer Trim Actuator (HSTA), and wiring harnesses between Flight Control Computers (FCCs), HSCU and HSTA.

The HSTA is trimmed via FCC rate command input such that the elevators remain within a specified tolerance of the faired position. This is called the elevator off-load function.

<p>The backup pitch trim switches provide direct pilot input to the HSTS in case of FCC failure.</p> Signup and view all the answers

<p>The HSTA is a dual load path ballscrew actuator powered by two redundant DC electric motors.</p> Signup and view all the answers

<p>The HSCU likely has active and damped modes to control stabilizer movement and damping based on flight conditions.</p> Signup and view all the answers

<p>The horizontal stabilizer pivots to change its angle of incidence as flaps are extended or retracted.</p> Signup and view all the answers

<p>The wiring harnesses allow communication and control signals to pass between the flight computers, stabilizer control unit and actuator.</p> Signup and view all the answers

<p>The horizontal stabilizer is mounted in a T-configuration on top of the vertical stabilizer.</p> Signup and view all the answers

<p>The subsystems listed are: Horizontal Stabilizer Actuation (27-43-00), Horizontal Stabilizer System Sensors (27-44-00), and Horizontal Stabilizer System Electronics (27-45-00).</p> Signup and view all the answers