11.9 - Flight Controls Flashcards
How is the runaway from the horizontal stabiliser prevented
No back brake
How is the brake overcome during a flap retraction on a flap system gearbox with no back brake
The friction is overcome by retraction power and slips as the flaps retract
How is the torque limiter reset after it has been actioned
It resets automatically when the over torque is removed
What is the function of a differential aileron system
To counter the negative turning moment
What is turn coordination
The rudder moves along with the ailerons to achieve a turn
Why are the control surfaces (ailerons, elevators and rudder) on some aircraft equips with balance weights
To prevent fluttering and vibration of the control surfaces
What can spoilers not be used for
To assist the flap system
What happens if the aircraft nose is going down and the left wing is going down
Aircraft is pitching and rolling
Why are horizontal stabilisers moveable on large aircraft
To compensate for a possible imbalance along the longitudinal axis during flight
What is an elevon
Combined elevator and aileron used on delta wing aircraft
Which statement describes the characteristics of a fowler flap
Wing Camber and wing area are increased when the flaps are extended
Which way do the ailerons have to deflect to turn the aircraft to the left
Left aileron must go up and right aileron must go down
How must flight control trim systems be designed
So that the pilot can see from the cockpit which position the corresponding surface is in
What happens if the flaps were extended on the right side only
Extension would be stopped automatically
Which axis does an aircraft roll around
Longitudinal axis
Given that two hydraulic motors are used via a differential to drive a single output, what would happen if one of the motors fails during operation
The fails motor is held by pressure off brake and the other motor drives the output at half speed
Why is the stabiliser used for pitch trim and not elevators
Because the imbalance along the longitudinal axis would be very large requiring excessive drag and large deflection of the elevators
What does fly by wire mean
Flight control inputs are transmitted via electrical cables and a servo valve regulates the hyd pressure at the actuator
How are the leading edge devices and flaps extended and retracted
Using a flap lever
The rudder position is indicated where
On the Engine Indicating Crew Alert System (EICAS) (Boeing??) display
The rod system is operated automatically by the movement of what
The mid flap
What effect will applying a rearward force to the control column have
Elevators will deflect upwards causing the aircraft nose to rise
What is the purpose of the pedals
They control the rudder, wheel brakes and nose wheel steering
How do the leading edge devices intersect with the flaps
They extend and retract with the flaps
With a side stick controller how can the other side stick be inhibited
By pressing the take over touch button on the side of the side stick
What happens to the control wheel if the aileron trim is moved to the right
It moves to the right
Why do some aircraft have inboard and outboard ailerons
Movement of the outer ailerons during high speed flight could lead to an excessive roll rate
