7.13 Control Cables Flashcards by Meg Bazeley

What’s things get twisted to make control cables

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

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

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What does 7x19 mean

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

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

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How should new cable be stored

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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How should cable be unwound

From a reel that is mounted to a spindle

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What should you cut cable with

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

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After cutting cable what radii should they be coiled into

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

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What should a cable not be cut with

Flame

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What should you wear when you are checking for broken wires

Gloves

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How should you examine a broken wires

Move a cloth along the cable in both directions

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

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

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

No more than 3 broken wires is permittable

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What else must a visual inspection of a cable look for

External wear of the cable, corrosion, internal cable wear

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

60%

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When inspecting pulleys what must you look out for

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

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What is the permitted amount of rolling sequences for sleeve terminals

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

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

Tensile strength test under a certain period of time

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

The connection is not strong enough

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

Cable terminal pull tester

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

Bent

How do you tighten a cable

By using a turnbuckle

When tightening cables what must you ensure for correct system rigging

Tightened evenly throughout

What does a cable tensiometer do

Precision instrument designed for rigging control cables

Before using a tensiometer you must ensure what?

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

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

Ensure the instrument is clamped on the cable else false reading

What are the three ways you can lock a turnbuckle

Wire locking Lock nuts Special locking clips

What’s are some advantages of cable and conduit

Lightweight and simple to install

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

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

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

Weight savings

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

Fairleads and pulleys

What technique is used to inspect internal wear in control cables

Move the strands apart to examine internally

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

Re,over and re protect the cable again

What are the wear limits for a 80mm pulley

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

What are cables inspected in accordance with

AMM

What is used to check the correct swaying of terminal ends

Calliper gauge

How is slippage of end fittings indicated

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

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

Damage pulleys and support structures

What is preloading

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

How is the left hand thread identified in a turnbuckle

By a groove on the left hand end

Before using a tensiometer what must be checked

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

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

Remotely operate services

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

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

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

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

What are the conduits of Teleflex control cables normally manufactured from

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

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

Clamp blocks 3 feet apart

Are no2 and no380 cables interchangeable

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

What are sliding end fitting used for

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

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

Anti-torsion tube

A Bowden cable relies on what device for its return action

Springs

What is a junction box used for

To connect a single cable to two others

If a conduit is damaged what must you do

Renew it

Should bends on a conduit be small or big

As big as possible