6.10 Flashcards

1
Q

What’s 6 advantages of cables ?

A
  1. Strong
  2. Light weight
  3. Flexible
  4. High mechanical efficiency
  5. Can be setup without backlash
  6. Vibration doesn’t effect cables
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2
Q

3 disadvantages of cables ?

A
  1. Tension must be adjusted regularly
  2. Prone to wear at points of contact ( pulleys etc )
  3. Tension varies with temp changes
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3
Q

Whats the construction process of a cable ?

A

Number of wires braided together forming a strand, number of strands are braided together to form a cable

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4
Q

Whats an opposite direction twist called ?

A

Regular lay - twisting wire and strands in opposite directions reduces the cables tendency to uncoil
( cables either have left or right regular lay )

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5
Q

What “lay” is it called if you twist the stands around the central core ?

A

Lang lay

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6
Q

Whats the 4 common types of steel cable used for aircraft ?

A
  1. Non flexible 1x7
  2. Non flexible 1x19
  3. Flexible 7x7
  4. Extra flexible 7x19
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7
Q

How many wires and strands are the non flexible 1x7 cable made from ?

A

1 strand and 7 wires

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8
Q

Where are non flexible cables only aloud to be used ?

A

Straight runs where the cable doesn’t pass over any pulleys.

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9
Q

Where are flexible cables used ?

A

Straight runs, or where large pulleys are being used.

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10
Q

Where are extra flexible cables used ?

A

Used where cables must change direction over small diameter pulleys ( flight controls / trim systems )

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11
Q

Whats the 4 cable end fittings ?

A
  1. Terminals
  2. Thimbles
  3. Bushings
  4. Shackles
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12
Q

Whats the 4 types of terminal fittings ?

A
  1. Threaded
  2. Fork ends
  3. Eye ends
  4. Single/double shank ball ends
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13
Q

What 3 terminals are used to connect a cable to a turnbuckle and bell cranks ?

A

Threaded
Fork
Eye

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14
Q

What are the ball terminals used to attach cables to ?

A

Quadrants

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15
Q

Where are the single shank and double shank ball ends used ?

A

Single shank - end of cable
Double shank - end of cable or in centre of cable run

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16
Q

Why would you use lock clad cables ?

A

To eliminate sagging and wear in long cables.

17
Q

Whats a lock clad cable made up of ?

A

Swaged aluminium tubing around steel cable

18
Q

What does the swaged aluminium tubing on lock clad cables do ?

A

Prevents abrasion of outer wire when pain through bulkheads / other obstructions in the aircraft.

19
Q

Whats a turnbuckle ?

A

Mechanical screw device which can make minor adjustments I cable length and tension

20
Q

How can the left hand thread side of turn buckle be identified ?

A

Has a groove at end

21
Q

When screwing turnbuckle onto cable, how many threads should be left exposed at either side of the turn buckle ?

A

Not more than 3 threads

22
Q

Whats the two ways of locking a turnbuckle ?

A
  1. Lock wire
  2. Special clips
23
Q

Why is a cable tension regulator used ?

A

When the cable tension changes due to expansion and contraction of the aircraft’s structure and cables I flight.

24
Q

Why are pulleys used ?

A

To guide cables and change their direction.
( pulleys require no further lubrication during use )

25
Why must pulleys have guards ?
To prevent cable jumping out of the grooves when there is lack in the cable
26
When should you use a fair lead ?
When there is a possibility of the cable contacting the aircraft’s structure.
27
Why are control rods used ?
Used in flight control systems to give push pull motion.
28
What can happen to control rods which are fitted with a bearing ?
Can become loose or disconnected due to failure of swaging that retains ball races.
29
What can happen if there is wear where the bell crank connects to the control rod ?
Cause a delay in response to the system it is connecting to.
30
Where is a torque tube used ?
Where there is a twisting motion in a control system.
31
Whats the two most common flexible control systems ?
1. Bowden cables 2. Teleflex control cables
32
What do small light aircraft use Bowden cables for ?
Throttle or fuel mixture control
33
What could cause Bowden cables to fail to function smoothly ?
If water or contaminants enter housing
34
What controls on modern day aircraft do teleflex cables operate ?
1. Engine controls 2. Propeller controls 3. Trimming controls
35
Whats the 3 types of teleflex cables ?
1. DS 23/2 2. DS 380 3. DS 169330
36
Where is a sliding end fitting used ?
Where there is no need to convert the push-pull movement of the cable to rotary.
37
When do you use a quick break unit ?
To facilitate the removal of components without disturbing the control.