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Kemble > 7.13 Control Cables > Flashcards

7.13 Control Cables Flashcards

1
Q

What’s things get twisted to make control cables

A

Steel wires get twisted into strands and these are twisted into cables
Normally the wires are twisted in one direction and strands in the opposite

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2
Q

What are the number of wires and strands in one cable ratios

A

3/32 - 7x7
1/8 - 7x19

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3
Q

What does 7x19 mean

A

The first digit consist of 7 strands and the last figure tells you how many steels wires that are in the strand

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4
Q

What is the difference between 1x7, 7x7 and 7x19 cables

A

1x7 is non flexible
7x7 is flexible
With 7x19 being extra flexible

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5
Q

How should new cable be stored

A

Carefully to avoid kinking
Should be supplied on a wooden drum at least 40 times the diameter than the individual cable

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6
Q

How should cable be unwound

A

From a reel that is mounted to a spindle

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7
Q

What should you cut cable with

A

Cable cutters, heavy duty pliers, or anvil, hammer or chisel

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8
Q

After cutting cable what radii should they be coiled into

A

Radii of no less than 50 times the diameter of the wire
And never less then 150mm(6inch)

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9
Q

What should a cable not be cut with

A

Flame

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10
Q

What should you wear when you are checking for broken wires

A

Gloves

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11
Q

How should you examine a broken wires

A

Move a cloth along the cable in both directions

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12
Q

What are the permittable limits for 7x19 cable with broken wires

A

6 broken wires in a same one inch length of cable with no more than 3 broken wires for each strand

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13
Q

What are the permittable limits for a 7x7 cable with broken wires

A

3 broken wires in a same one inch length of cable with no more than 2 broken wires for each strand

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14
Q

For cables which touch pulleys or go through fairleads or pressure seals what is the rule regarding broken wires

A

No more than 3 broken wires is permittable

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15
Q

What else must a visual inspection of a cable look for

A

External wear of the cable, corrosion, internal cable wear

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16
Q

If a wire is worn over ……% it must be declared unserviceable

A

60%

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17
Q

When inspecting pulleys what must you look out for

A

Pulley wobble, cable does not skid in groove, incorrect wear at bottom of groove

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18
Q

What is the permitted amount of rolling sequences for sleeve terminals

A

No more than 4 rolling sequences
Will cause brittleness and hardening of material otherwise

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19
Q

What test must all connections between cable and terminal be subject too

A

Tensile strength test under a certain period of time

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20
Q

If there is a slippage between a cable and terminal then….?

A

The connection is not strong enough

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21
Q

Rolled on balls and terminals are checked for sufficient tensile strength by using a..?

A

Cable terminal pull tester

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22
Q

A cable is only allowed to be preloaded when it is not ……..?

A

Bent

23
Q

How do you tighten a cable

A

By using a turnbuckle

24
Q

When tightening cables what must you ensure for correct system rigging

A

Tightened evenly throughout

25
Q

What does a cable tensiometer do

A

Precision instrument designed for rigging control cables

26
Q

Before using a tensiometer you must ensure what?

A

The correct riser is mounted on the instrument for the cable size to be tested

27
Q

When using a testiometer what must you do before you lock the break lever rod

A

Ensure the instrument is clamped on the cable else false reading

28
Q

What are the three ways you can lock a turnbuckle

A

Wire locking
Lock nuts
Special locking clips

29
Q

What’s are some advantages of cable and conduit

A

Lightweight and simple to install

30
Q

What are the two most common methods of cable and conduit methods

A

Teleflex and bowden
(Consist of cable passing through conduit (covering) with correct end fittings)

31
Q

What is the main advantage a cable system has over mechanical systems

A

Weight savings

32
Q

What areas on a control cable are susceptible to wear and broken wires

A

Fairleads and pulleys

33
Q

What technique is used to inspect internal wear in control cables

A

Move the strands apart to examine internally

34
Q

What action much be taken when light surface corrosion is discover on a control cable

A

Re,over and re protect the cable again

35
Q

What are the wear limits for a 80mm pulley

A

0.015” or 0.40mm max at top or groove
0.007” or 0.20mm at bottom of the groove

36
Q

What are cables inspected in accordance with

A

AMM

37
Q

What is used to check the correct swaying of terminal ends

A

Calliper gauge

38
Q

How is slippage of end fittings indicated

A

By marking or painting the cable at the end fitting before carrying out the tension check

39
Q

When rigging a control cable, extra tension will ……..

A

Damage pulleys and support structures

40
Q

What is preloading

A

Necessary to preload as a new cables length would increase its length under load.

41
Q

How is the left hand thread identified in a turnbuckle

A

By a groove on the left hand end

42
Q

Before using a tensiometer what must be checked

A

Calibration sticker
Calibration table has same serial number as tensiometer
Check all rises are present
Lock mechanism works correctly

43
Q

What are Bowden and teleflex cables designed to do in aircraft systems

A

Remotely operate services

44
Q

Teleflex control cables are designed to transmit pulling loads only - True or false

A

False, they transmit pull and push forces. Bowden cable transmit force in one direction only

45
Q

What is the difference between No2 and No380 cable (doubt we need to know)

A

No2 - built from High tensile steel which is wound with compression winding.
No380 - built from high tensile steel wire which is wound with a right hand helix winding and spacer winding

46
Q

What are the conduits of Teleflex control cables normally manufactured from

A

Light alloy
(Sometimes steel and tungum for special circumstances)
(May be bent in curves to radii no less than 3 inches)

47
Q

What are the devices used to secure straight sections of Teleflex cable conduit to structures

A

Clamp blocks 3 feet apart

48
Q

Are no2 and no380 cables interchangeable

A

No, because of the difference in the lay of cables (left and right hand)

49
Q

What are sliding end fitting used for

A

Used when necessary to convert pull- push movement of cable into rotary

50
Q

What device is used to orevent Teleflex cables from turning in the conduit

A

Anti-torsion tube

51
Q

A Bowden cable relies on what device for its return action

A

Springs

52
Q

What is a junction box used for

A

To connect a single cable to two others

53
Q

If a conduit is damaged what must you do

A

Renew it

54
Q

Should bends on a conduit be small or big

A

As big as possible

Kemble (39 decks)

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