6.10 Control Cables(5)

Question 1

Where are control cables commonly used in

Answer 1

smaller aircraft

Question 2

Advantages of control cables?

Answer 2

• Strong, lightweight, flexible, set up without backlash

Question 3

Disadvantages of control cables

Answer 3

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

Question 4

What is the basic element of a cable

Answer 4

strand

Question 5

What forms a strand

Answer 5

• number of wires braided together

Question 6

What forms a cable

Answer 6

• number of strands braided together

Question 7

The opposite direction twist is most common and is called what

Answer 7

regular lay

Question 8

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

Answer 8

• Non flexible (1x7)
• Non flexible (1x19)
• Flexible (7x7)
• Extra flexible (7x19)

Question 9

Aircraft control cables vary in diameter from

Answer 9

1.6mm-9.53mm

Question 10

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

Answer 10

T

Question 11

what does 1x7 represent

Answer 11

1 strand with 7 wires

Question 12

What does 1x19 represent

Answer 12

1 strand with 19 wires

Question 13

What does the flexible cable consist of

Answer 13

7x7 (7 strands with 7 wires)

Question 14

What is extra flexible cable consist of

Answer 14

7x19 (7 strands with 19 wires)

Question 15

Extra flexible (7x19) is most commonly used where

Answer 15

• aircraft flight controls and trim systems

Question 16

Can extra flexible cables go over small pulleys?

Answer 16

yes

Question 17

What are the terminal types for lock clad cables

Answer 17

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

Question 18

How are lock-clad assemblies produced?

Answer 18

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

Question 19

Why was the lock clad system developed

Answer 19

to eliminate sagging and wear in long cables

Question 20

What is a turnbuckle assembly

Answer 20

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

Question 21

What is the function of a turnbuckle

Answer 21

-minor adjustments in cable length and for adjusting cable tension

Question 22

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

Answer 22

• must be locked with wire locking or locking clips

Question 23

When would you use a turnbuckle

Answer 23

• where a great deal of tension is required

Question 24

What is the function of a cable tension regulator

Answer 24

Uses extension and compression of springs to compensate cable tension

Question 25

What is a pulley used for

Answer 25

- guide cables and change direction of the cable movement

Question 26

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

Answer 26

No

Question 27

What does the guards in a pulley system prevent

Answer 27

prevents cables from slipping off due to temperature variations

Question 28

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

Answer 28

- to support the pulley

Question 29

What is the function of a 'fairlead' 'grommet'

Answer 29

- prevents cable contact with the aircraft structure

Question 30

What can push rod be manufactured from

Answer 30

aluminium or steel

Question 31

What are push rods

Answer 31

give push pull motion

Question 32

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

Answer 32

T

Question 33

What are bell cranks and quadrants usually made out of

Answer 33

heat treated aluminium

Question 34

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

Answer 34

-torque tube is installed

Question 35

What are the 2 most common flexible control systems

Answer 35

- Bowden cables - Teleflex control systems

Question 36

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

Answer 36

T

Question 37

What is a Bowden cable

Answer 37

- inner steel cable, which is free to slide inside an outer housing

Question 38

What is the outer housing of a Bowden cable

Answer 38

- heavy gauge helical steel wire

Question 39

When will a Bowden cable fail to function

Answer 39

- If water or contaminants get into the housing

Question 40

What is the most prone problem with Bowden cables

Answer 40

- water freezing inside the cable

Question 41

What is the assembly of a Teleflex system

Answer 41

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

Question 42

When is sliding end units used

Answer 42

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

Question 43

How is the left hand thread on a turnbuckle identified

Answer 43

- The left hand thread is identified by a groove at the end of the barrel

Question 44

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

Answer 44

T

Question 45

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

Answer 45

T