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m11 > .1 - Theory of Flight > Flashcards

.1 - Theory of Flight Flashcards

1
Q

Where are the control of slats located?

A

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

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2
Q

Where are the control of Roll Spoilers?

A

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

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3
Q

What are the 3 Lift Devices?

A

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

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4
Q

What are the Trim Devices?

A

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

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5
Q

What are the secondary flight controls of the Aircraft?

A
  • Lift Devices: Slats, Flaps, Speed Brake
  • Trim Devices: THS, Aileron Trim, Rudder Trim
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6
Q

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

A

During Landing

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7
Q

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

A

During Takeoff

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8
Q

What are the Control Transmissions

A

Mechanical Transmission, Hydraulic
Transmission, Electrical Transmission

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9
Q

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

A

Electrical Transmission

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10
Q

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

A

Hydraulic Transmission

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11
Q

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

A

Mechanical Transmission

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12
Q

What are the kinds oftabs used on Aircraft?

A

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

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13
Q

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

A

Anti-Balance Tab

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14
Q

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

A

Balance Tab

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15
Q

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

A

Trim Tab

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16
Q

What is the purpose of Tabs?

A

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

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17
Q

What is Critical Mach Number?

A

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

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18
Q

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

A

Bow Waves is produced

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19
Q

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

A

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

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20
Q

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

A

Mach

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21
Q

What is Surface Flutter?

A

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

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22
Q

How is Surface Flutter prevented?

A

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

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23
Q

When is the surface balanced?

A

When the CG coincides with the hinge fine

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24
Q

Speed of sound is depending on?

A

Temperature. Speed of Sound is directly proportional to Temperature

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25
Q

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

A

Tuck Under Effect

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26
Q

How do you correct the Tuck Under Effect?

A

THS / Horizontal Stabilizer Mach trim system

27
Q

For Supersonic Flight what happens to the four parameters?

A

Pressure, Temperature, and Density increases while the Velocity decreases

28
Q

When does the elevators lock?

A

When the Aircraft experiences the Tuck Under Effect

29
Q

What creates on the front of airfoil during supersonic flight?

A

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

30
Q

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

A

Transonic flight

31
Q

What aircraft structure that supports the weight of the aircraft?

A

Wing

32
Q

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

A

Lateral axis

33
Q

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

A

Static balancing

34
Q

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

A

Control wheel and control column

35
Q

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

A

Side stick

36
Q

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

A

Elevons

37
Q

What are included in the primary flight controls?

A

Ailerons, roll spoilers, elevators, rudder

38
Q

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

A

Lift device and trim
devices

39
Q

What are the flight controls for the lift devices?

A

Flaps, slats, speed brakes

40
Q

What trim devices do we use for the flight controls?

A

Trimmable horizontal stabilizer, ailerons, and rudder

41
Q

Atmospheric characteristic that affects the speed and sound propagation?

A

Temperature

42
Q

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

A

Decrease in strength

43
Q

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

A

True

44
Q

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

A

False

45
Q

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

A

False

46
Q

What limits the rudder deflection?

A

Air speed

47
Q

How do we achieve control transmission?

A

Mechanical, hydraulical, and electrical

48
Q

Tab that deflects same direction as the control surfaces

A

Anti-balance tab

49
Q

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

A

Balance tab

50
Q

Main lift devices

A

Flaps

51
Q

Aircraft speed divided by the
speed of sound

A

Mach

52
Q

Actual thickness divided by chord length

A

Profile thickness

53
Q

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

A

Shock waves and expansion waves

54
Q

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

A

Bow wave

55
Q

Secondary flight control system consists of the following:

A

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

56
Q

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

A

Flaperons

57
Q

Where do we operate pitch trim devices

A

Center pedestal

58
Q

What is the value of critical mach number?

A

Mach 0.8

59
Q

Where do you find the local mach number?

A

Surfaces of the wing

60
Q

Rule to reduce wave drag

A

Area rule

61
Q

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

A

Old military aircraft

62
Q

Area rule that has lesser wave drag

A

Waist fuselage

63
Q

What do we achieve in transonic profile?

A

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

64
Q

What different properties change in supersonic flight?

A

Density, temperature, and pressure increases while velocity decreases

m11 (4 decks)

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