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M6 Richard 2019 > 6:10 Control Cables > Flashcards

6:10 Control Cables Flashcards

1
Q

What is the main advantage of control cables over other mechanical means such as actuators or shafts and chains

A

Weight saving

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2
Q

Is handling, checking and adjusting control cables easy or hard

A

Relatively easy

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3
Q

In aircraft construction what is the minimum tensile strength for individual cables

A

1200nm squared at a breaking elongation of 2-7%

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4
Q

How are cables made up (3 step)

A

Wires-strands-cables

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5
Q

How are the wires and strands twisted

A

The the wires are twisted one way and the strands another

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6
Q

What are non flexible cables normally used for

A

Purposes such as drag or anti drag wires or bracing

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7
Q

When would extra flexible cables be used

A

Over primary flight controls or when the operation over w pulley is frequent

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8
Q

How would you check the tension of large aircraft cables

A

By using a tensiometer

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9
Q

How are end connections attached to cables

A

By swaging

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10
Q

What are the different cable terminal types

A
  • Ball (single or double shank)
  • Stud end
  • Fork end
  • Eye end
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11
Q

What are fairleads

A

Fairleads are used to guide control cables to prevent contact with the aircraft structure

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12
Q

What are pressure seals

A

Pressure seals are like fairleads but are used when a cable passes through a pressure bulkhead

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13
Q

What is the purpose of pulleys

A

Pulleys are used in cable runs to effect a change in direction

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14
Q

What is the purpose of a turnbuckle

A

Turnbuckles are a mechanical screw device. They are used in cable control runs to make minor adjustments to cable length or cable tension

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15
Q

What type of threads do turnbuckles have

A

One end has a right hand thread and the other has a left hand thread

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16
Q

What ways can turnbuckles be locked

A

Normally a clip type lock is used

17
Q

What is a cable tension regulator

A

A mechanical device used in aircraft to maintain cable tension even through changes in temperature

18
Q

What must be done to cable tension regulators when they need to be disconnected from cable runs

A

They must be locked or snubbed (can be very dangerous if they are not

19
Q

What is the major advantage of cable and conduit over other methods

A

Relatively light and installation is simple

20
Q

What are two examples of cable and conduit control run

A

Teleflex and Bowden

21
Q

What type of transmissions can teleflex cables operate

A

Push and pull

22
Q

When are sliding end fittings used

A

Where it is not necessary to convert a pull-push movement in to a rotary movement

23
Q

What is used to take up angular movement in control runs

A

Swivel joints

24
Q

What is the rotary travel limited to in a single entry unit and what what angle of engagement must be maintained between the gear wheel and the teeth of the cable

A

Limited to 270° and a minimum of 40° of engagement

25
Q

Why would a double entry unit be required over a single entry unit

A

When a greater amount of travel is required

26
Q

When would swivel joints be installed

A

Where rotary movement of the control lever at the receiving end does not exceed 90°

27
Q

What is the purpose of quick break units

A

They are installed in control runs to facilitate the removal of a component with out disturbing the run

28
Q

What must rigid conduit be

A

Clean, free from dents and deformation and reasonably straight

29
Q

Can damage to rigid conduit be repaired

A

It can be repaired by inserting a new length of conduit and by using a connector to connect both ends together

30
Q

When tightening a nipple type connector why should two spanner’s be used

A

To prevent damaging the conduit

31
Q

How do Bowden cable runs operate

A

They operate as pull only and the return is acted by a spring

32
Q

What is the purpose of a junction box

A

A junction box is used to connect a single cable to two others where two components are to be operated by a single control

33
Q

What is the minimum bend radius for Bowden cable conduit

A

12x diameter of the conduit

34
Q

If a Bowden conduit is damaged must it be renewed or can it be repaired

A

It must be replaced

35
Q

For Bowden controls longer than 2ft, how often should the run be supported

A

Every 12 inches

36
Q

What must a Bowden cable be lubricated with

A

Graphited synthetic grease applied at room temperature (60-70°f)

M6 Richard 2019 (10 decks)

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