.1 - Theory of Flight

Question 1

Where are the control of slats located?

Answer 1

It operates together with the Flaps by using the Flaps Lever located on the center pedestal

Question 2

Where are the control of Roll Spoilers?

Answer 2

It operates together with the Ailerons by using the Control Wheel (Boeing) or Side Stick (Airbus)

Question 3

What are the 3 Lift Devices?

Answer 3

Slats (Leading Edge Devices), Flaps,
and Speed Brakes

Question 4

What are the Trim Devices?

Answer 4

Trimmable Horizontal Stabilizer (THS), Aileron Trim (Roll Trim), and Rudder Trim
(Yaw trim)

Question 5

What are the secondary flight controls of the Aircraft?

Answer 5

• Lift Devices: Slats, Flaps, Speed Brake
• Trim Devices: THS, Aileron Trim, Rudder Trim

Question 6

When the Slats and Flaps increases both Lift and Drag, during what phase of the flight it happens?

Answer 6

During Landing

Question 7

When the Slats and Flaps increases only the Lift, during what phase of the flight it
happens?

Answer 7

During Takeoff

Question 8

What are the Control Transmissions

Answer 8

Mechanical Transmission, Hydraulic
Transmission, Electrical Transmission

Question 9

What kind o f Transmission uses Electrical Signal Inputs to use Mechanical, Hydraulic and Electrical Components?

Answer 9

Electrical Transmission

Question 10

What kind of Transmission uses hydraulic components to convert input signals into hydraulic pressure, it also uses mechanical components?

Answer 10

Hydraulic Transmission

Question 11

What kind of Transmission uses cable system and rods to operate?

Answer 11

Mechanical Transmission

Question 12

What are the kinds oftabs used on Aircraft?

Answer 12

Balance Tab, Anti-Balance Tab,
Control Tab, Trim Tab

Question 13

What kind of tab deflects in the same
direction as the control surface?

Answer 13

Anti-Balance Tab

Question 14

What kind of tab deflects in the opposite
direction of the control surface?

Answer 14

Balance Tab

Question 15

What kind of tab is used to compensate for imbalance o f the aircraft?

Answer 15

Trim Tab

Question 16

What is the purpose of Tabs?

Answer 16

To lessen the workload of Pilots when
maneuvering the Flight Control Surfaces

Question 17

What is Critical Mach Number?

Answer 17

When the airflow is almost equal or
equal to the speed of sound, we reach Critical Mach Number

Question 18

What happens on the Leading Edge of flight control surfaces when we have a high Mach number?

Answer 18

Bow Waves is produced

Question 19

What is the relationship of Local Mach
number and Flight Mach number?

Answer 19

The Local Mach number is greater (0.2
theoretically) than the Flight Mach number

Question 20

It is the aircraft speed divided by the speed of sound?

Answer 20

Mach

Question 21

What is Surface Flutter?

Answer 21

Unstable Flight due to competition of
down-going tendency of a surface with CG and Up-going effect of the air loads

Question 22

How is Surface Flutter prevented?

Answer 22

It is prevented if the control surface is
hydraulically powered or by static balancing (balance weights installed) if the control surface is mechanically operated

Question 23

When is the surface balanced?

Answer 23

When the CG coincides with the hinge line

Question 24

Speed of sound is depending on?

Answer 24

Temperature. Speed of Sound is directly proportional to Temperature

Question 25

What do you call to the effect when the aircraft has a nose down reaction after passing the critical Mach number?

Answer 25

Tuck Under Effect

Question 26

How do you correct the Tuck Under Effect?

Answer 26

THS / Horizontal Stabilizer Mach trim system

Question 27

For Supersonic Flight what happens to the four parameters?

Answer 27

Pressure, Temperature, and Density increases while the Velocity decreases

Question 28

When does the elevators lock?

Answer 28

When the Aircraft experiences the Tuck Under Effect

Question 29

What creates on the front of airfoil during supersonic flight?

Answer 29

It creates airflow separation and it reduces when the airspeed increases and it produces bow waves.

Question 30

What aircraft speed where the aircraft id at the same position of its created disturbance?

Answer 30

Transonic flight

Question 31

What aircraft structure that supports the weight of the aircraft?

Answer 31

Wing

Question 32

It is the imaginary axis in the aircraft that is measured from wing tip to wing tip

Answer 32

Lateral axis

Question 33

What condition should be made in control surface in order to balance and prevent surface flutter?

Answer 33

Static balancing

Question 34

What is the control input device for the movement of ailerons and elevators?

Answer 34

Control wheel and control column

Question 35

What is th control input device for the movement of both ailerons and elevators?

Answer 35

Side stick

Question 36

In delta wing configuration, how do you call the two moving control surfaces that is seen on the trailing edge?

Answer 36

Elevons

Question 37

What are included in the primary flight controls?

Answer 37

Ailerons, roll spoilers, elevators, rudder

Question 38

What are the two sub-categories in the secondary flight control?

Answer 38

Lift device and trim devices

Question 39

What are the flight controls for the lift devices?

Answer 39

Flaps, slats, speed brakes

Question 40

What trim devices do we use for the flight controls?

Answer 40

Trimmable horizontal stabilizer, ailerons, and rudder

Question 41

Atmospheric characteristic that affects the speed and sound propagation?

Answer 41

Temperature

Question 42

What happens to the strength of metallic structures when it is heated due to high speed condition of flight?

Answer 42

Decrease in strength

Question 43

True or False: Bank to the left and right is taking place above the longitudinal axis using ailerons.

Answer 43

True

Question 44

True or False: Pitch up and down above the vertical axis using elevators

Answer 44

False

Question 45

True or False: yaw to the left and right is taking place above the vertical axis using aileron

Answer 45

False

Question 46

What limits the rudder deflection?

Answer 46

Air speed

Question 47

How do we achieve control transmission?

Answer 47

Mechanical, hydraulical, and electrical

Question 48

Tab that deflects same direction as the control surfaces

Answer 48

Anti-balance tab

Question 49

All surfaced found on the trailing edge of the control surface that deflects opposite

Answer 49

Balance tab

Question 50

Main lift devices

Answer 50

Flaps

Question 51

Aircraft speed divided by the speed of sound

Answer 51

Mach

Question 52

Actual thickness divided by chord length

Answer 52

Profile thickness

Question 53

What are the two main types of waves that form due to supersonic flow?

Answer 53

Shock waves and expansion waves

Question 54

Forms at the leading edge when the flight exceeds the speed of sound

Answer 54

Bow wave

Question 55

Secondary flight control system consists of the following:

Answer 55

Speed brake lever, flap lever, pitch trim wheels, aileron trim switch, and rudder trim switch

Question 56

Also known as the aileron droop function that increases effective flap area?

Answer 56

Flaperons

Question 57

Where do we operate pitch trim devices

Answer 57

Center pedestal

Question 58

What is the value of critical mach number?

Answer 58

Mach 0.8

Question 59

Where do you find the local mach number?

Answer 59

Surfaces of the wing

Question 60

Rule to reduce wave drag

Answer 60

Area rule

Question 61

Its area rule where there is a large increase in wave drag

Answer 61

Old military aircraft

Question 62

Area rule that has lesser wave drag

Answer 62

Waist fuselage

Question 63

What do we achieve in transonic profile?

Answer 63

Flatter upper surface, more curved leading edge, thinner trailing edge

Question 64

What different properties change in supersonic flight?

Answer 64

Density, temperature, and pressure increases while velocity decreases