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How Flight Controls Work | Part 1 : Horizontal Stabilizer

By Aircraft Science · more summaries from this channel

3 min video·en··144293 views

This is an AI-generated summary of “How Flight Controls Work | Part 1 : Horizontal Stabilizer” — a 3 min YouTube video by Aircraft Science, published May 7, 2022. It condenses the full transcript into 10 key takeaways with clickable timestamps.

Summary

This video details the ground operation of the Boeing 777's horizontal stabilizer, explaining how it's controlled by the fly-by-wire system, primary flight computers, and actuator control electronics to trim the aircraft's pitch.

Key Points

  • The Boeing 777 was the first Boeing aircraft to incorporate a fly-by-wire system, enhancing performance and safety while ensuring pilot authority. 
  • The horizontal stabilizer is a critical control surface used to trim the aircraft's pitch, with its operation varying between ground and flight. 
  • At the core of the aircraft's flight control system are three Primary Flight Computers (PFCs) that process all control surface commands from pilots or the autopilot. 
  • Four Actuator Control Electronics (ACE) assist the PFCs by converting analog signals to digital and vice versa, ensuring redundancy and accuracy. 
  • When on the ground, stabilizer trim switches on the control columns send electrical signals to the ACE, which then transmits them to the PFC. 
  • The PFC calculates the stabilizer's movement speed, allowing maximum speed on the ground, and sends the final signal back to the ACE. 
  • The ACE converts the digital signal to analog and sends it to two stabilizer trim control modules, which use hydraulic power to operate the stabilizer actuator. 
  • Hydraulic motors, powered by the trim modules, turn a ball screw connected to the stabilizer, causing its leading edge to move and adjust the aircraft's pitch. 
  • Stabilizer position is indicated in the cockpit via position transducers, and releasing the trim switch directs the module to stop movement and re-engage hydraulic brakes. 
  • An alternate pitch trim lever provides manual control, mechanically connected to the trim modules to operate the stabilizer independently of the electrical system. 
How Flight Controls Work | Part 1 : Horizontal Stabilizer

How Flight Controls Work | Part 1 : Horizontal Stabilizer

This video details the ground operation of the Boeing 777's horizontal stabilizer, explaining how it's controlled by the fly-by-wire system, primary flight computers, and actuator control electronics to trim the aircraft's pitch.

Key Points

—The Boeing 777 was the first Boeing aircraft to incorporate a fly-by-wire system, enhancing performance and safety while ensuring pilot authority.
—The horizontal stabilizer is a critical control surface used to trim the aircraft's pitch, with its operation varying between ground and flight.
—At the core of the aircraft's flight control system are three Primary Flight Computers (PFCs) that process all control surface commands from pilots or the autopilot.
—Four Actuator Control Electronics (ACE) assist the PFCs by converting analog signals to digital and vice versa, ensuring redundancy and accuracy.
—When on the ground, stabilizer trim switches on the control columns send electrical signals to the ACE, which then transmits them to the PFC.
—The PFC calculates the stabilizer's movement speed, allowing maximum speed on the ground, and sends the final signal back to the ACE.
—The ACE converts the digital signal to analog and sends it to two stabilizer trim control modules, which use hydraulic power to operate the stabilizer actuator.
—Hydraulic motors, powered by the trim modules, turn a ball screw connected to the stabilizer, causing its leading edge to move and adjust the aircraft's pitch.
—Stabilizer position is indicated in the cockpit via position transducers, and releasing the trim switch directs the module to stop movement and re-engage hydraulic brakes.
—An alternate pitch trim lever provides manual control, mechanically connected to the trim modules to operate the stabilizer independently of the electrical system.
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