Flight Control Systems

Question 1

lateral oscillatory motions as described by the FAA

Answer 1

Dutch roll

Question 2

occurrence in which an aircraft moves around two axes at the same time

Answer 2

Dutch roll

Question 3

is used when the elevator surface is of inadequate size

Answer 3

variable incidence horizontal stabilizer

Question 4

is that by which a vehicle travels from one point to another in space

Answer 4

translational motion

Question 5

relates to the motion of the aircraft around three defined axes: pitch, roll and yaw

Answer 5

rotational motion

Question 6

enables the pilot to exercise control over the aircraft during all portions of flight

Answer 6

flight control system

Question 7

‘feel’ systems that need to provide the pilot with progressive and well-harmonized controls that make the aircraft safe and pleasant to handle

Answer 7

carefree handling

Question 8

provided by the moving canard surfaces, or foreplanes, as they are sometimes called, located either side of the cockpit

Answer 8

pitch control

Question 9

provide the very powerful pitch control authority required by an agile high-performance aircraft

Answer 9

canard surfaces

Question 10

provided by the differential motion of the foreplanes, augmented to a degree by the flaperons

Answer 10

roll control

Question 11

also provided by differential action of the wing trailing edge flaperons (sometimes called elevons)

Answer 11

roll control

Question 12

provided by the single rudder section

Answer 12

yaw control

Question 13

generally less important for high-performance aircraft than for conventional aircraft due to the high levels of excess power

Answer 13

yaw control

Question 14

provided by a combination of flaperons and leading edge slats

Answer 14

high lift control

Question 15

aircraft that has air brakes located on the upper rear fuselage

Answer 15

Eurofighter Typhoon

Question 16

pitch control surfaces placed on the front fuselage to attain longitudinal stability

Answer 16

canards

Question 17

a wing trailing edge surface used on tailless delta wing aircraft in order to provide both the pitch and roll control

Answer 17

elevons

Question 18

a wing trailing edge surface used on the aircraft for lifting from short runways

Answer 18

flaperons

Question 19

combination of rudder and the elevator on the tail

Answer 19

ruddervators

Question 20

performs the function of a horizontal stabilizer and an elevator

Answer 20

stabilator

Question 21

used for trimming an aircraft for straight and level flight

Answer 21

trim tabs

Question 22

small auxiliary control surfaces that are hinged to the trailing edge of the elevator

Answer 22

trim tabs

Question 23

used to provide higher lift at low speeds for take-off

Answer 23

trailing edge flaps and leading edge flaps/slats

Question 24

used to increase the drag to slow down the aircraft during landing

Answer 24

trailing edge flaps and leading edge flaps/slats

Question 25

called as air brakes, dive brakes or drag brakes

Answer 25

speed brakes

Question 26

used to decelerate the aircraft in flight

Answer 26

speed brakes

Question 27

designed to pop out of the wing at a near 90-degree angle to the airflow, which will increase the drag by spoiling the stream line

Answer 27

speed brakes

Question 28

used to reduce the lift

Answer 28

spoilers

Question 29

exercised by four elevators located on the trailing edge of the tailplane

Answer 29

pitch control

Question 30

provided by two aileron sections located on the outboard third of the trailing edge of each wing

Answer 30

roll control

Question 31

provided by three independent rudder sections located on the trailing edge of the fin (or vertical stabilizer)

Answer 31

yaw control

Question 32

damp out unpleasant ‘Dutch roll’ oscillations which can occur during flight and which can be extremely uncomfortable for the passengers, particularly those seated at the rear of the aircraft

Answer 32

aircraft yaw dampers

Question 33

affected by several flap sections located on the inboard two-thirds of the wing trailing edges

Answer 33

flap control

Question 34

provided by several leading edge slats, which extend forwards and outwards from the wing leading edge

Answer 34

slat control

Question 35

deployed when all of the over-wing spoilers are extended together which has the effect of reducing lift as well as increasing drag

Answer 35

speed brakes

Question 36

exercised by moving the control column fore and aft

Answer 36

pitch control

Question 37

achieved by moving the control column from side to side or rotating the control yoke

Answer 37

roll control

Question 38

controlled by the rudder pedals

Answer 38

yaw control

Question 39

system where a sequence of rods are used to link the control surfaces to the cabin input

Answer 39

push-pull control rod system

Question 40

In a push-pull control rod system, it is used to alter the direction of the force and to obtain the coupling between stick movement and the control surface deflection.

Answer 40

bell crank lever

Question 41

requires a large numbers of pulleys, brackets and guards

Answer 41

cable pulley system

Question 42

In a cable pulley system, they are used to alter the direction of lines.

Answer 42

pulleys

Question 43

In a cable pulley system, it is employed at the base of the control column to impact force and motion to the cable system.

Answer 43

quadrant

Question 44

In a cable pulley system, it is attached to the control surface, which changes linear motion of the cable into rotary motion.

Answer 44

torque tube

Question 45

system where electronic signals are used to operate hydraulic jacks which can move the control surfaces

Answer 45

electronic flight control system

Question 46

system where the control inputs from the pilot are transmitted to the control surfaces by electronic signals

Answer 46

fly-by-wire system

Question 47

In a fly-by-wire system, they sense the position of the control column and sends that information to independent computers.

Answer 47

electronic transducers

Question 48

In a fly-by-wire system, it is used to convert electric voltages into hydraulic power.

Answer 48

electro-hydraulic servo valve

Question 49

a data bus system that has a data rate of 1 Mbit/s and a word length of 20 bits, so it can receive or transmit up to 50000 data words/second

Answer 49

MIL STD 1553 B data bus system

Question 50

a data bus system that operates at 2 Mbit/s

Answer 50

ARINC 629 data bus system

Question 51

FBW system without motion sensor

Answer 51

direct electric link system

Question 52

uses the optic cables for transmitting the control signals

Answer 52

fly-by-light system

Question 53

convert light signals into electrical signals for actuating the hydraulic control valves

Answer 53

electro-optic converters

Question 54

a system used to guide a vehicle without assistance from a person

Answer 54

autopilot

Question 55

axis controlled by a single-axis autopilot

Answer 55

roll axis

Question 56

axes controlled by a two-axis autopilot

Answer 56

pitch and roll axes

Question 57

sense the aircraft's position

Answer 57

gyros

Question 58

move the control surfaces

Answer 58

servos

Question 59

increase the strength of gyro signals

Answer 59

amplifiers

Question 60

connected to flight instruments which indicate direction, rate of turn, bank or pitch

Answer 60

gyro sensing units

Question 61

used to convert the electrical signals (from a change in attitude) into mechanical force, which is used to move the control surfaces

Answer 61

servo unit

Question 62

four (4) basic autopilot components

Answer 62

i. sensing elements ii. command elements iii. output elements iv. computing elements

Question 63

manually operated to produce signals which cause the aircraft to climb, dive or turns

Answer 63

command unit

Question 64

five (5) sensing elements in an autopilot system

Answer 64

- directional gyro - turn and bank gyro - attitude gyro - altitude control and navigation signals - heading selector

Question 65

used to process the signal and passes them to the control surfaces

Answer 65

computing elements

Question 66

two (2) servos under output elements of an autopilot system

Answer 66

- electric motors - electro/pneumatic servos

Question 67

output element of an autopilot system used to actuate the control surfaces

Answer 67

servo