FLIGHT CONTROLS M11.9 Flashcards
What is an Elevon?
A 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 left?
Left aileron up
Right aileron 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?
The extension would be stopped automatically
Which axis does an aircraft roll around?
Longitudinal axis
Given that 2 hydraulic motors are used via a differential to drive a single output, what happens if 1 of the motors fails during operation?
The failed motor is held by the pressure off brake and the other motor drives the output at half speed
Why is the stabiliser used for pitch trim and not the 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 by electric cables and a servo valve regulates the hydraulic pressure at the actuator
How is the runaway off the horizontal stabiliser prevented
By having 2 switches
How is the brake overcome during flap retraction on a flap system gearbox with a no-back brake?
The friction brake is overcome by retraction power and slips as the flaps retract
How is a torque limiter reset if it has been activated?
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 co-ordination?
The rudder moves along with ailerons to achieve a turn
Why are the control surfaces (aileron, elevator, and rudder) on some aircraft equipped with balance weights?
To prevent fluttering and vibration of the control surface
