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M11 Resit > 11.9 > Flashcards

11.9 Flashcards

1
Q

What’s manoeuvre load control

A

Using control surfaces to move the centre of lift inboard during manoeuvres so that the bending moment is reduced so there’s a reduction in load on the wing

**
As the root is thicker so it can take the loads compared to the outer wing

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2
Q

Why are cable operated systems often used

A

Strong
Lightweight
And food at transferring loads over a large distance

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3
Q

Why are cable operated systems often used

A

Strong
Lightweight
And food at transferring loads over a large distance

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4
Q

What size control cables are usually used in aviation

A

7x19 flexible

7x7 flexible

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5
Q

What’s the purpose of the guards on the pulleys

A

Close fitted guards that prevent jamming or cables slipping off when they slacken due to temp changes

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6
Q

How accurate is a tensiometer

A

98%

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7
Q

What do tension regulators do

A

Allows cable under all conditions like expansion and contraction of cable and aircraft to be taken in and out equally to maintain uniform tension

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8
Q

What’s a disadvantage of a push pull control rod

What’s there overall advantage

A

Heavy weight and harder to route without complicating the control system

They can accept both push and pull loads without a parallel system

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9
Q

What are bell cranks used for

A

Used in conjunction of control rods and are frequently used to change direction

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10
Q

What are bell cranks used for

A

Used in conjunction of control rods and are frequently used to change direction

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11
Q

When are torque tubes used

A

When a twisting motions needed in a control system

Eg. Ailerons flaps slats

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12
Q

What are screwjacks used for

A

Moving surfaces that experience extreme aerodynamic loads like horiz stab and leading and trailing edge flap

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13
Q

What two critical functions do PCU’s do

A

They position the flight control surface in a response to mechanical or electrical commands

Represent a principle structural element capable of withstanding flight loads and providing protection against flutter

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14
Q

What two sections is the servo control unit divided into

A

Power section

Distribution section

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15
Q

What two sections is the servo control unit divided into

A

Power section - converts the hydraulic pressure to mechanical force

Distribution section

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16
Q

What are the two main operating MODES of the servo control unit

A

Control or active mode

Damping mode

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17
Q

What’s the damping mode of the servo control unit used for

A

A gust damper for control surfaces when the ac is on the ground

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18
Q

What are manual ans power assisted flying controls known as

A

Reversible flying controls

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19
Q

Can the pilot still move the controls on the event of a hydraulic failure in a power assisted control system

A

Yes

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20
Q

What do screw jacks do

A

Convert rotary motion to linear travel

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21
Q

What’s the reason for not utilising pneumatics to its full potential for flying control systems

A

Bc aids compressible

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22
Q

What mode is the electronic pcu in operation at below cruise speed

A

Normal mode

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23
Q

When there’s a single hydraulic or electric failure on the pcu what modes selected

A

Bypass

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24
Q

When there’s a single hydraulic or electric failure on the pcu what modes selected

A

Bypass

25
Q

When the pcu had a failure or not power at or above cruise speed what mode is the electric pcu in

A

blocking/damped mode

26
Q

Major advantage of fly by wire

A

Weight saving

27
Q

What are the gyroscopes used for in ac and how many are there

A

3

And to sense movement on the roll, pitch and yaw axis and sends signals to the computers to move the appropriate actuators

28
Q

What’s used to perform test on fly by wire systems

A

BITE

29
Q

What’s used to perform test on fly by wire systems

A

BITE

30
Q

What are the two fly by wire laws

A

Normal

Alternate

31
Q

What’s a benifit of fly by wireless

A

Weight saved

32
Q

What type of aircraft control systems don’t require artificial feel

A

Mechanical flight controls

33
Q

What’s the basic artificial feel system

A

Spring box

34
Q

What’s the basic artificial feel system

A

Spring box

35
Q

Why do the spring artificial feel provide greater resistance say higher speed

A

To prevent over stressing ac structure

36
Q

Why do the spring artificial feel provide greater resistance say higher speed

A

To prevent over stressing ac structure

37
Q

What does yaw damper prevent

A

Dutch roll

38
Q

What speeds can mach tuck occur at

A

0.75-1.2

39
Q

What’s the mcrit number

A

The m crit number is the point on the ac where the first molecule of air reaches the speed of sound over the aircraft

40
Q

What’s Mach tuck caused by

A

The centre of pressure moving aft on the wing

41
Q

What’s used t prevent mach tuck

A

Mach trim

42
Q

At what speeds would ac required additional amount of structural reinforcements for the loads generated by moving large control surfaces

A

650km/h

43
Q

At what speeds would ac required additional amount of structural reinforcements for the loads generated by moving large control surfaces

A

650km/h

44
Q

What do gust locks do

A

Lock the controls when the ac is parked

45
Q

When a control surface is checked for static balance on a balance stand what does the downward travel of the trailing edge indicate

Upward travel of the trailing edge indicate

A

Under balance

Over balance

46
Q

Are better flight operations Gaines from static overbalance or under balance

A

Nose heavy static overbalance

47
Q

Whats used to determine that the control surface is balanced before carrying out balancing procedures

A

Bubble protractors

48
Q

What’s the main advantage of the calculation method of balancing

A

Can be performed without removing the control surface from the ac

49
Q

What’s rigging

A

Established the correct position of the main components in transmission system and adjusting the rods and cables accordingly

50
Q

What’s rigging

A

Established the correct position of the main components in transmission system and adjusting the rods and cables accordingly

51
Q

How’s a control Column checked to see if it has been rigged correctly

A

By checking the rig pin hole is alligned with adjoining structure

52
Q

How’s a control Column checked to see if it has been rigged correctly

A

By checking the rig pin hole is alligned with adjoining structure

53
Q

How’s a control Column checked to see if it has been rigged correctly

A

By checking the rig pin hole is alligned with adjoining structure

54
Q

What’s the pitch attitude

How’s it calculate

A

Angle between longitudinal axis and artificial horizon

A of a sensor

55
Q

What’s a of a

A

Angle between oncoming air and a reference line in wing or fuselage

56
Q

What a of a gives max lift

A

14

57
Q

What happens to a of a during climb if slats retract

A

Increases so can lead to stall

58
Q

What happens to a of a during climb if slats retract

A

Increases so can lead to stall

59
Q

What happens to a of a during climb if slats retract

A

Increases so can lead to stall

M11 Resit (13 decks)

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