6:10 Control Cables Flashcards

(36 cards)

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
Why would a double entry unit be required over a single entry unit
When a greater amount of travel is required
26
When would swivel joints be installed
Where rotary movement of the control lever at the receiving end does not exceed 90°
27
What is the purpose of quick break units
They are installed in control runs to facilitate the removal of a component with out disturbing the run
28
What must rigid conduit be
Clean, free from dents and deformation and reasonably straight
29
Can damage to rigid conduit be repaired
It can be repaired by inserting a new length of conduit and by using a connector to connect both ends together
30
When tightening a nipple type connector why should two spanner’s be used
To prevent damaging the conduit
31
How do Bowden cable runs operate
They operate as pull only and the return is acted by a spring
32
What is the purpose of a junction box
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
What is the minimum bend radius for Bowden cable conduit
12x diameter of the conduit
34
If a Bowden conduit is damaged must it be renewed or can it be repaired
It must be replaced
35
For Bowden controls longer than 2ft, how often should the run be supported
Every 12 inches
36
What must a Bowden cable be lubricated with
Graphited synthetic grease applied at room temperature (60-70°f)