HSCU Normal Control Mode

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Questions and Answers

What is the primary function of the Horizontal Stabilizer Trim System (HSTS)?

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

What are the three main components of the HSTS?

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.

How does the horizontal stabilizer work in conjunction with the FCCs and elevators during flight?

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.

What is the purpose of the backup pitch trim switches?

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

Describe the construction of the Horizontal Stabilizer Trim Actuator (HSTA).

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

What control modes does the Horizontal Stabilizer Control Unit (HSCU) have?

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

How does the horizontal stabilizer's angle change during flap extension/retraction?

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

What is the purpose of having wiring harnesses between the FCCs, HSCU and HSTA?

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

Where is the horizontal stabilizer mounted on the aircraft?

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

What other subsystems are part of the overall stabilizer control system?

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). Signup and view all the answers

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