Flight Control

[Ref AircraftSystems: Mechanical,electrical,andavionicssubsystemsintegration,Third Edition ISBN: 978-0-470-05996-8]

Primary Flight Control

Primary flight control in pitch, roll and yaw is provided by (exercised by/achieve by) the control surfaces

example Airbus A320:

  • Pitch control (control column moving fore and aft; pushing and pulling) is exercised by four elevators (more than one sections)
  • Roll control (control column moving from side to side; rotating) is provided by two aileron sections
  • Yaw control (rudder pedals moving fore and aft) is provided by three independent rudder sections

Each section is independently powered by a dedicated flight control actuator, powered in turn by one of several aircraft hydraulic power systems


Secondary Flight Control

  • Flaps – are leading-edge or trailing-edge high-lift device (HLDs) to increase wing area and/or camber, thereby greatly increasing lift for a given speed
  • Speed-brakes – are deployed when all of the over-wing spoilers are extended together which has the effect of reducing lift as well as increasing drag
  • Trim systems – trim tab, balance tab, anti-servo tab…
  • Yaw dampers – damp out unpleasant ‘Dutch roll’ oscillations


Flight Control Linkage Systems

two main methods:

  1. Push-pull control rod systems
    • 4 major components: 1) Trim actuators, 2) Spring feel units, 3) ‘Q’ feel unit and 4) Power control units (PCUs)
  2. Cable and pulley systems


#primary #secondary #flight #controls #system

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