11.9 Flight Controls Flashcards
What are the 3 primary flight controls
- aileron
- elevator
- rudder
What controls the ailerons and the elevators?
Control stick/ yoke/ wheel/ joystick
What controls the rudder?
Foot pedals/ rudder pedals
When are the inboard and outboard ailerons used?
Low speed flight
What ailerons do you use in high speed flight?
Inboard only
How do you solve the problem of negative turning moment?
Differential aileron deflection
What do elevators do?
Longitudinal control for pitch, climb and dive
Controlled around the lateral axis
What does pushing the yoke forwards do?
Lowers the nose, elevators down
What are the trim systems used for?
Added to flight control members to assist crew in controlling the aircraft and compensates for imbalances
What are the 4 trim controls?
Balance tab
Trim tab
Servo tab
Spring tab
What do trim tabs do?
Small aerobics in trailing edge of primary control surfaces
Enables pilot to trim out any unbalances without exerting pressure in primary flight controls
What is the purpose of servo tabs?
Aid in moving control surface and holding it in a desired position
What do the balance tab do?
Moves in opposite direction of primary flight controls
(Forces acting on tab assist in moving primary flight controls)
What purpose do spring tabs have?
Same purpose as hydraulic acustors
Aid the pilot in moving the primary flight control surfaces
Why do we have wing control surfaces
Improves the performance of aircraft as controls aeroelastic loads
What are the two types of active aeroelastic control techniques?
. Manoeuvre load control
. Gust load
What does the rudder do?
Directional control around the vertical axis
Nose left or right / yaw
If the left rudder pedal is pressed what way does the rudder deflect?
If left is pushed then rudder deflects left
What do spoilers do?
Assist in controlling the bank of the aircraft
When would a spoiler rise up?
On the side of the aircraft that the aileron has rises up on
What do plain flaps cause in terms of its shape?
Increases wing camber and provides greater lift
Forms trailing edge when retracted
How do slots in a wing benefit the flight?
The spanwise air allows air flow from below wing to upper surface
Hugh speed air flow mixed with boundary layer which delays boundary layer separation on the upper surface of the wing.
When do you use speed brakes and why?
It’s a secondary control surface which increases drag and reduces speed on the aircraft when flying.
Applied automatically when ground spoilers are deployed on ground.
What are control cables normally made from?
7x7 or 7x14
Flexible steel wires
