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M6 Resit > 6.10 Control Cables(5) > Flashcards

6.10 Control Cables(5) Flashcards

1
Q

Where are control cables commonly used in

A

smaller aircraft

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2
Q

Advantages of control cables?

A
  • Strong, lightweight, flexible, set up without backlash
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3
Q

Disadvantages of control cables

A
  • Tension must be regularly adjusted
  • Prone to wear at points of contact
  • tension varies with temperature change
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4
Q

What is the basic element of a cable

A

strand

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5
Q

What forms a strand

A
  • number of wires braided together
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6
Q

What forms a cable

A
  • number of strands braided together
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7
Q

The opposite direction twist is most common and is called what

A

regular lay

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8
Q

What are the 4 common type of steel cable used for aircraft control systems

A
  • Non flexible (1x7)
  • Non flexible (1x19)
  • Flexible (7x7)
  • Extra flexible (7x19)
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9
Q

Aircraft control cables vary in diameter from

A

1.6mm-9.53mm

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10
Q

Non-flexible cables are only allowed to be used for straight runs where the cable does not pass over any pulleys (T or F)

A

T

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11
Q

what does 1x7 represent

A

1 strand with 7 wires

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12
Q

What does 1x19 represent

A

1 strand with 19 wires

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13
Q

What does the flexible cable consist of

A

7x7 (7 strands with 7 wires)

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14
Q

What is extra flexible cable consist of

A

7x19 (7 strands with 19 wires)

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15
Q

Extra flexible (7x19) is most commonly used where

A
  • aircraft flight controls and trim systems
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16
Q

Can extra flexible cables go over small pulleys?

A

yes

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17
Q

What are the terminal types for lock clad cables

A
  • Ball (single or double shank)
  • Stud end (short or long thread)
  • fork end
  • eye end
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18
Q

How are lock-clad assemblies produced?

A
  • by swaging aluminium alloys tubing onto galvanised or stainless aircraft cable (7x7 or 7x19)
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19
Q

Why was the lock clad system developed

A

to eliminate sagging and wear in long cables

20
Q

What is a turnbuckle assembly

A

mechanical screw device consisting of 2 threaded terminals and a threaded barrel

21
Q

What is the function of a turnbuckle

A

-minor adjustments in cable length and for adjusting cable tension

22
Q

When you have correctly adjusted a turnbuckle, what must be the next step

A
  • must be locked with wire locking or locking clips
23
Q

When would you use a turnbuckle

A
  • where a great deal of tension is required
24
Q

What is the function of a cable tension regulator

A

Uses extension and compression of springs to compensate cable tension

25
Q

What is a pulley used for

A
  • guide cables and change direction of the cable movement
26
Q

Pulley bearings that are sealed, pre-lubricated, do they require further lubrication during use?

A

No

27
Q

What does the guards in a pulley system prevent

A

prevents cables from slipping off due to temperature variations

28
Q

What is the bracket attached to the structure of the aircraft for

A
  • to support the pulley
29
Q

What is the function of a ‘fairlead’ ‘grommet’

A
  • prevents cable contact with the aircraft structure
30
Q

What can push rod be manufactured from

A

aluminium or steel

31
Q

What are push rods

A

give push pull motion

32
Q

Push rods can be adjusted at one or both ends (T or F)

A

T

33
Q

What are bell cranks and quadrants usually made out of

A

heat treated aluminium

34
Q

What is installed when an angular or twisting motion is required in a control system

A

-torque tube is installed

35
Q

What are the 2 most common flexible control systems

A
  • Bowden cables
  • Teleflex control systems
36
Q

Aircraft control cables are only capable of performing a pulling action due to their lack of rigidity (T or F)

A

T

37
Q

What is a Bowden cable

A
  • inner steel cable, which is free to slide inside an outer housing
38
Q

What is the outer housing of a Bowden cable

A
  • heavy gauge helical steel wire
39
Q

When will a Bowden cable fail to function

A
  • If water or contaminants get into the housing
40
Q

What is the most prone problem with Bowden cables

A
  • water freezing inside the cable
41
Q

What is the assembly of a Teleflex system

A

consists of a flexible transmitting cable operating inside a rigid metal or flexible conduit

42
Q

When is sliding end units used

A
  • when it is not necessary to convert the pull-push movement of the cable into a rotary movement
43
Q

How is the left hand thread on a turnbuckle identified

A
  • The left hand thread is identified by a groove at the end of the barrel
44
Q

Bowden cables transmit pull forces with a return mechanism provided by a spring (T or F)

A

T

45
Q

Teleflex cables transmit pull and push forces (T or F)

A

T

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