11.9 - Flight Controls

Question 1

How is the runaway from the horizontal stabiliser prevented

Answer 1

No back brake

Question 2

How is the brake overcome during a flap retraction on a flap system gearbox with no back brake

Answer 2

The friction is overcome by retraction power and slips as the flaps retract

Question 3

How is the torque limiter reset after it has been actioned

Answer 3

It resets automatically when the over torque is removed

Question 4

What is the function of a differential aileron system

Answer 4

To counter the negative turning moment

Question 5

What is turn coordination

Answer 5

The rudder moves along with the ailerons to achieve a turn

Question 6

Why are the control surfaces (ailerons, elevators and rudder) on some aircraft equips with balance weights

Answer 6

To prevent fluttering and vibration of the control surfaces

Question 7

What can spoilers not be used for

Answer 7

To assist the flap system

Question 8

What happens if the aircraft nose is going down and the left wing is going down

Answer 8

Aircraft is pitching and rolling

Question 9

Why are horizontal stabilisers moveable on large aircraft

Answer 9

To compensate for a possible imbalance along the longitudinal axis during flight

Question 10

What is an elevon

Answer 10

Combined elevator and aileron used on delta wing aircraft

Question 11

Which statement describes the characteristics of a fowler flap

Answer 11

Wing Camber and wing area are increased when the flaps are extended

Question 12

Which way do the ailerons have to deflect to turn the aircraft to the left

Answer 12

Left aileron must go up and right aileron must go down

Question 13

How must flight control trim systems be designed

Answer 13

So that the pilot can see from the cockpit which position the corresponding surface is in

Question 14

What happens if the flaps were extended on the right side only

Answer 14

Extension would be stopped automatically

Question 15

Which axis does an aircraft roll around

Answer 15

Longitudinal axis

Question 16

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

Answer 16

The fails motor is held by pressure off brake and the other motor drives the output at half speed

Question 17

Why is the stabiliser used for pitch trim and not elevators

Answer 17

Because the imbalance along the longitudinal axis would be very large requiring excessive drag and large deflection of the elevators

Question 18

What does fly by wire mean

Answer 18

Flight control inputs are transmitted via electrical cables and a servo valve regulates the hyd pressure at the actuator

Question 19

How are the leading edge devices and flaps extended and retracted

Answer 19

Using a flap lever

Question 20

The rudder position is indicated where

Answer 20

On the Engine Indicating Crew Alert System (EICAS) (Boeing??) display

Question 21

The rod system is operated automatically by the movement of what

Answer 21

The mid flap

Question 22

What effect will applying a rearward force to the control column have

Answer 22

Elevators will deflect upwards causing the aircraft nose to rise

Question 23

What is the purpose of the pedals

Answer 23

They control the rudder, wheel brakes and nose wheel steering

Question 24

How do the leading edge devices intersect with the flaps

Answer 24

They extend and retract with the flaps

Question 25

With a side stick controller how can the other side stick be inhibited

Answer 25

By pressing the take over touch button on the side of the side stick

Question 26

What happens to the control wheel if the aileron trim is moved to the right

Answer 26

It moves to the right

Question 27

Why do some aircraft have inboard and outboard ailerons

Answer 27

Movement of the outer ailerons during high speed flight could lead to an excessive roll rate