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mod 6 > 6.10 control cables > Flashcards

6.10 control cables Flashcards

1
Q

Where are cables used?

A

Smaller aircraft’s to transmit force to flight controls

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2
Q

What the advantages of cables?

A

ightweight
Flexible
Strong
High mechanical efficiency

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3
Q

What can cables transmit power without gaining?

A

Backlash

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4
Q

Why must tension be adjusted frequently?

A

Because the cables stretch over a period of timed

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5
Q

What disadvantage are cables prone to?

A

Prone to wear

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6
Q

What can cause tension to vary?

A

Temperature change

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7
Q

When cables stretch, do they become deformed?

A

No

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8
Q

Does vibration effect control cables?

A

no

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9
Q

Why are failures of in control cables rare?

A

Because of the amount of wires in a cable

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10
Q

All aircraft control cables are what in terms of manufacturing?

A

Preformed

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11
Q

What is the basic element of the control cable?

A

A strand

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12
Q

What is a strand?

A

A number of wires braided together

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13
Q

What do strands bundled together form?

A

A cable

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14
Q

When does wires and strands’ tendency to uncoil reduce?

A

When the wires and strands are twisted in the opposite direction, but the cables are wrapped in the same direction

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15
Q

What is the opposite direction twist also called?

A

A regular lay

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16
Q

If the strands are twisted around a central core, what is it called?

A

Lang lay

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17
Q

How are cables designated?

A

To the number of strands

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18
Q

What do aircraft cables diameter vary to?

A

1.6mm and 9.53mm

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19
Q

What does 1X7 mean?

A

One strand compromised of 7 different wires

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20
Q

What is involved in non flexible wires?

A

1 X 7
1 X 19

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21
Q

Where are non flexible wires used?

A

Straight runs where the cables don’t pass over pulleys

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22
Q

What is involved in flexible wires?

A

7 X 7

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23
Q

Where are flexible cables used?

A

Straight runs and where large pulleys are being used

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24
Q

What does extra flexible cables involve?

A

7 x 19

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25
Q

Where are extra flexible cables used?

A

Trim and flight controls (Areas that require a change in direction)

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26
Q

Terminal fitting are usually of what type?

A

The swage type

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27
Q

What are threaded end, fork end and eye ends used for?

A

To connect to turnbuckles and other linkage

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28
Q

What are ball terminals used for?

A

Attaching cables to quadrants, and other connections where space is limited

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29
Q

Where are single shank ball ends located?

A

On the end of a a cable

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30
Q

Where are double shank ball ends used?

A

Either on the ends of a cable, or in the centre

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31
Q

Where are thimble and bushing fitting used?

A

Terminal fittings where supplies are limited but the repair is needed

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32
Q

How can you help a cable compensate for temperature change?

A

By fitting cable tension regulators

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33
Q

What do cable tension regulators do?

A

Extension or compression of springs to adjust to cable quadrant positionings

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34
Q

What is dangerous about disconnecting cables?

A

They can spring back becsuse of the tension

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35
Q

What must aircraft cable regulators be in accordance with?

A

The AMM

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36
Q

Where are turnbuckles used?

A

Where tension is required

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37
Q

What must you do to a turnbuckle when you’re done with it?

A

It must be safetied or locked

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38
Q

What else is used to secure turnbuckles?

A

Single or double wrap method which used lock wire

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39
Q

What is a turnbuckle assembly?

A

A mechanical screw device consisting of two threaded terminals and a threaded barrel

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40
Q

What are turnbuckles used for?

A

To make minor adjustments and adjust cable tension

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41
Q

What is important when screwing a turnbuckle?
How many threads can be exposed?

A

Turn both turnbuckles an equal amount of turned into the barrel until no more than 3 threads are exposed

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42
Q

How can the end of the barrel with left hand threads be identified?

A

By a groove or knurl around the end of the barrel

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43
Q

How are lock clad cables produced?

A

By swaging aluminium onto galvanised or stainless aircraft cable

44
Q

What is the code for lock clad cables?

A

7 X 7
7 X 19

45
Q

Why was lock clad developed?

A

To eliminate sagging and wear in long aircraft cables

46
Q

Why is lock clad used?

A

Stress is reduced
Sag is eliminated
Vibration is reduced
Aluminium tubing stops abrasion of outer wires

47
Q

What are pulleys used for?

A

To guide cables and change the direction of cable movement

48
Q

What is the state of pulley bearings before use?

A

Pre lubricated and sealed

49
Q

What is used to support the pulley?

A

A bracket

50
Q

How are cables passing over the pulleys kept in place?

A

By a guard

50
Q

What is the guard pin?

A

A Clevis pin held in place by a split pin and washer to prevent damage

51
Q

What are guards used for?

A

To prevent slipping or jamming

52
Q

When is a fair lead or grommet used?

A

When there is possibility or the aircraft contacting the structure

52
Q

What are push rods used for?

A

As links in the flight control system to give push pull motion

52
Q

Where can push rods be adjusted from?

A

Both ends or one end

52
Q

What does a push rod consist of?

A

A tube with threaded rod ends

52
Q

What permits attachment of the tube to flight control system parts?

A

The rod end or clevis

53
Q

What prevents the rod end or coves from unloosening?

A

A check it

54
Q

How can control rods on bearings be prevented from loosening?

A

The flange of the rod end is interposed between the ball race and the anchored end

55
Q

What are bell cranks and quadrants be made out of?

A

Heat treated aluminium

56
Q

Where are ball cranks and quadrants used?

A

In push pull tubing systems to change direction of travel and mechanical advantage

57
Q

What can cause a delay in response?

A

Wear where connection is

58
Q

Why are torque tubes installed?

A

When an angular or twisting motion is required

59
Q

What are aircraft cables only capable of in terms of forces?

A

Pulling

60
Q

When a two directional force is needed, the use of what is needed?

A

When a two directional force is needed, the use of what is needed?

61
Q

What does cable control consist of?

A

A single cable passing through a covering (conduit)

62
Q

Why is straightening of a conduit prevented even though a pull force will try to bend it back into place?

A

Because the end fittings are fixed

63
Q

What is a Bowden cable?

A

An inner steel cable which moves linearly and is free to slide

64
Q

What do small aircraft use the Bowden cables for?

A

Throttle or fuel mixture control

65
Q

When do Bowden cables fail to function smoothly?

A

When water or contaminants enter

66
Q

What are teleflex controls used for?

A

To operate components

67
Q

How do teleflex transmit force?

A

Through a push and pull motion

68
Q

If the teleflex is not long enough, what can be used for connection?

A

Rigid cables or linkages

69
Q

What else may be used as a thread?

A

A helix winding

70
Q

Are cables interchangeable with each other on aircraft?

A

No

71
Q

What way does DS 23/2 (No.2) turn?

A

Left no helix

72
Q

What is DS 23/2 made out of?

A

steel

73
Q

What way does DS 380 turn?

A

Right

74
Q

What does DS 380 not have?

A

Compression wire

75
Q

What is different about the diameter in DS 380?

A

Greater diameter than the core

76
Q

Where is DS 169330 used?

A

Hot areas (it’s made of stainless steel)

77
Q

What is the transmitting end of a control usually fitted with?

A

A wheel consisting of a hand operating gear

78
Q

When can a push pull operating handle be used?

A

Where the loading is light and straight

79
Q

What are swivel joints used for?

A

To take up angular movements

80
Q

In a single entry unit, what is the rotary travel limited to?

A

270 degrees

81
Q

When is a double entry used?

A

When greater travel is required

82
Q

In double entry, what is the cable degree?

A

90 degrees 120 degrees 180 degrees

83
Q

What is the short cable that comes out from the back of the conduit known as?

A

A spent travel tube

84
Q

What is a straight lead unit?

A

The cable passes straight through the unit and engages on a few teeth on the wheel

85
Q

What are straight lead units not suitable for?

A

Heavy loads

86
Q

What are junction box units used for?

A

To reverse direction or to branch a run of cables

87
Q

What does anti torsion tubes do?

A

Not allow the cable to turn in the conduit so doesn’t change the relative adjustments

88
Q

Where can swivel joints be installed?

A

Where rotary movement of the control does not exceed 90 degrees

89
Q

What do swivel joints consist of?

A

A ball and a socket

90
Q

When are sliding end fittings used?

A

When it’s not necessary to convert the push pull motion into rotary

91
Q

What do slide fittings comprise of?

A

Guide tube and end fittings

92
Q

What are quick break units?

A

Facilitate removal of components without disturbing the control

93
Q

What do conduit connectors have?

A

Nipples

94
Q

What are conduit connectors similar in construction to?

A

All metal pipe couplings

95
Q

What is a torsion drive?

A

The final linear movement of the control is converted to a rotary action using the distributor box

96
Q

What is the torsion drive similar to?

A

The normal flexible drive

97
Q

What is the distributor box similar to?

A

A receiver unit

98
Q

In a distributor box, how can you convert the rotary motion of the torsion drive to the linear movement of a trmiming tab?

A

A sprocket driven screw jack

99
Q

How is the left hand thread on a turnbuckle identified?

A

By a groove at the end of a barrel

100
Q

Which type of cable is used in aircraft control and trim systems?

A

Extra flexible wires

mod 6 (12 decks)

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