aircraft flight controls

Question 1

are aerodynamic devices that allow a pilot to adjust
and control the aircraft’s flight attitude.

Answer 1

Aircraft flight control surfaces

Question 2

rotation about lateral axis

Answer 2

pitch ( elevator )

Question 3

rotation about vertical axis

Answer 3

yaw ( rudder )

Question 3

rotation about longitudinal axis

Answer 3

roll ( ailerons )

Question 4

credited with developing the first practical control
surfaces

Answer 4

Wright brothers

Question 5

modern control surfaces used what?

Answer 5

warping

Question 6

he made hinged control surfaces, the same type of concept first patented some four decades earlier in the United Kingdom.

Answer 6

Glenn Curtiss

Question 7

what is the technique used and patented by wright brothers?

Answer 7

consisted of a system of pulleys and cables to twist the trailing edges of the wings in opposite directions.

Question 8

it has the advantage of not causing stresses that are a problem of wing warping and are easier to build into structures.

Answer 8

Hinged control surfaces

Question 9

was an early system for lateral (roll) control of a fixed-wing aircraft.

Answer 9

Wing warping

Question 10

it is an imaginary line about which a body rotates

Answer 10

axis

Question 11

The simplest way to understand the axes is to think of them as long rods passing through the aircraft where each will intersect at the aircraft

Answer 11

center of gravity

Question 12

axis that extends lengthwise ( nose through tail )

Answer 12

longitudinal axis “roll”

Question 13

axis that extends crosswise ( wing tip through wing tip )

Answer 13

lateral axis “pitch”

Question 14

what are the three airplane movements?

Answer 14

pitch, roll, and yaw

Question 15

what are the three primary control surfaces?

Answer 15

aileron, elevator/stabilator, and rudder

Question 16

what are the three axes of rotation?

Answer 16

longitudinal, lateral, and vertical

Question 17

are means by which a pilot controls the direction and attitude of an aircraft in flight.

Answer 17

Aircraft flight controls

Question 18

Flight control systems are subdivided into?

Answer 18

primary and secondary flight controls.

Question 19

are required to safely control an aircraft during flight and consist of ailerons, elevators (or, in some installations,
stabilator) and rudder

Answer 19

primary flight controls

Question 20

are intended to improve the
aircraft performance characteristics or to relieve excessive control loading

Answer 20

secondary flight controls

Question 21

consist of high lift devices such as slats and flaps as well as flight spoilers and
trim systems.

Answer 21

secondary flight controls

Question 22

carefully designed to provide adequate responsiveness to control inputs while allowing a natural feel.

Answer 22

Aircraft control systems

Question 23

the controls usually feel soft and sluggish, and the aircraft responds slowly to control applications.

Answer 23

low airspeeds

Question 24

It controls roll about the longitudinal axis

Answer 24

Ailerons

Question 25

the controls become increasingly firm and aircraft response is more rapid.

Answer 25

higher airspeeds

Question 26

connected by cables, bell cranks, pulleys, and/or push-pull tubes which are controlled by a control/cyclic stick.

Answer 26

Ailerons

Question 27

It is attached to the outboard trailing edge of each wing and move in the opposite direction from each other.

Answer 27

Ailerons

Question 28

Since the downward deflected aileron produces more lift as evidenced by the wing raising, it also produces more drag.

Answer 28

Adverse Yaw

Question 29

this added drag causes the wing to slow down slightly.

Answer 29

adverse yaw

Question 30

a result of differential drag and the slight difference in the velocity of the left and right wings.

Answer 30

adverse yaw

Question 31

more pronounced at low airspeeds.

Answer 31

adverse yaw

Question 32

when pressure is applied to the control wheel, or control stick, the aileron that is being raised pivots on an offset hinge

Answer 32

fries-type ailerons

Question 32

one aileron is raised a greater distance than the other aileron and is lowered for a given movement of the control wheel or control stick.

Answer 32

differential ailerons

Question 33

This projects the leading edge of the aileron into the airflow and creates drag

Answer 33

fries-type ailerons

Question 33

It helps equalize the drag created by the lowered aileron on the opposite wing and reduces adverse yaw.

Answer 33

fries-type ailerons

Question 34

what are the four common types of flaps

Answer 34

o Plain Flap o Split Flap o Slotted Flap o Fowler Flap

Question 35

It is attached to the trailing edge of the wing, increase both lift and induced drag for any given AOA.

Answer 35

flap

Question 36

It is the most common high-lift devices used on aircraft.

Answer 36

flap

Question 37

It is deflected from the lower surface of the airfoil and produces a slightly greater increase in lift than the plain flap.

Answer 37

split flap

Question 37

it is the most popular flap on aircraft today.

Answer 37

slotted flap

Question 38

It increases the lift coefficient significantly more than plain or split flaps.

Answer 38

slotted flap

Question 39

It contains a gap that vastly increases airflow across the entire flap, enhancing its effectiveness.

Answer 39

slotted flap

Question 40

this flap design not only changes the camber of the wing, it also increases the wing area.

Answer 40

fowler flaps

Question 41

instead of rotating down on a hinge, it slides backwards on tracks. In the first portion of its extension, it increases the drag very little, but increases the lift a great deal as it increases both the area and camber.

Answer 41

fowler flaps

Question 44

High-lift devices also can be applied to the leading edge of the airfoil. The most common types are?

Answer 44

o Fixed Slots o Movable Slats o Leading Edge Flaps o Leading Edge Cuffs

Question 45

it directs airflow to the upper wing surface and delay airflow separation at higher angles of attack.

Answer 45

Fixed slots

Question 46

The slot does not increase the wing camber, but allows a higher maximum CL because the stall is delayed until the wing reaches a greater AOA.

Answer 46

fixed slot

Question 47

Consists of leading edge segments that move on tracks. At low angles of attack, each slat is held flush against the wing’s leading edge by the high pressure that forms at the wing’s leading edge

Answer 47

movable slats

Question 48

Are used to increase both CL-MAX and the camber of the wings. This type of leading edge device is frequently used in conjunction with trailing edge flaps and can reduce the nose-down pitching movement produced by the latter.

Answer 48

Leading Edge Flaps

Question 49

Are also used to increase both CL-MAX and the camber of the wings. Unlike leading edge flaps and trailing edge flaps, leading edge cuffs are fixed aerodynamic devices.

Answer 49

Leading Edge Cuffs

Question 50

Are used to relieve the pilot of the need to maintain constant pressure on the flight controls, and usually consist of flight deck controls and small hinged devices attached to the trailing edge of one or more of the primary flight control surfaces.

Answer 50

trim system

Question 50

deployed from the wings to spoil the smooth airflow, reducing lift and increasing drag.

Answer 50

Spoilers

Question 51

The most common installation on small aircraft is a single trim tab attached to the trailing edge of the elevator.

Answer 51

trim tabs

Question 51

Common types of trim systems include what?

Answer 51

trim tabs, balance tabs, antiservo tabs, ground adjustable tabs, and an adjustable stabilizer.

Question 52

Looks like trim tabs and are hinged in approximately the same places as trim tabs.

Answer 52

balance tabs

Question 53

MUST REMEMBER!!

Answer 53

The essential difference between the two is that the balancing tab is coupled to the control surface rod so that when the primary control surface is moved in any direction, the tab automatically moves in the opposite direction.

Question 54

it is a small portion of a flight control surface that deploys in such a way that it helps to move the entire flight control surface in the direction that the pilot wishes it to go.

Answer 54

SERVO TABS

Question 55

is a dynamic device that deploys to decrease the pilots work load and de-stabilize the aircraft.

Answer 55

SERVO TABS

Question 56

Are sometimes referred to as flight tabs and are used primarily on large aircraft.

Answer 56

SERVO TABS

Question 57

work in the same manner as balance tabs except, instead of moving in the opposite direction, they move in the same direction as the trailing edge of the stabilator.

Answer 57

ANTISERVO TABS

Question 58

also functions as a trim device to relieve control pressure and maintain the stabilator in the desired position.

Answer 58

ANTISERVO TABS

Question 59

This tab is bent in one direction or the other while on the ground to apply a trim force to the rudder. The correct displacement is determined by trial and error.

Answer 59

ground adjustable tabs

Question 60

Rather than using a movable tab on the trailing edge of the elevator, some aircraft have an?

Answer 60

adjustable stabilizer

Question 61

what is used to control the movement of yaw

Question 62

what is the movement controlled by the elevator

Answer 62

pitch

Question 63

what is the type of stability controlled by the rudder?

Answer 63

directional

Question 64

what is the axes of rotation of the elevator

Answer 64

lateral

Question 65

what primary flight control is used to control the movement roll

Answer 65

aileron

Question 66

what is the axes of rotation of aileron

Answer 66

longitudinal

Question 67

what is the type of stability controlled by aileron

Answer 67

lateral

Question 68

where is rudder located

Answer 68

vertical stabilizer

Question 69

which primary flight control is located in vertical stabilizer

Answer 69

rudder

Question 70

what is the most popular flap on aircraft today

Answer 70

slotted flap