Control Cables Flashcards

1
Q

Control cables

A

Weight saving

Can be mended and routed any where

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2
Q

What is cable made off

A

Individual cable wire
Pre streghted from manufacture
The steel wires are twisted into strands and these are twisted into cables.
the wires are twisted in one direction and strands the opposite

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3
Q

What is a 7 x 7 cable

A

7 strains x 7 wires per strand

7 strains tired together, then 7 of them are tied together

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4
Q

What is the diameter of a 7 x 7 cable

A

3/32 inch

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5
Q

What is the diameter of a 7 x 19 cable

A

1/8

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6
Q

Cable tension

A

Due to temperature changes
Large aircraft have a complex automatic cable tensioning system to maintain tension relative as the aircraft expands and contracts due to ambient air temperatures.
Small aircraft cable tensions are set up as a compromise as they do not have this automatic system.
Check it is calibrated
Cable tensiometer is used ans adjusted via a turnbuckle

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7
Q

Fair leads

A

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

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8
Q

Pressure seals

A

Where control cables pass through pressure bulkheads, pressure seals are used. The seals are filled with grease and allow the cable to pass freely whilst preventing the loss of pressurisation air.

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9
Q

Pulleys

A

Pulleys are used in control cable runs to effect a change in direction.
Guard pin stops from coming out

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10
Q

Gagging pin

A

Put in regulator to prevent it from moving

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11
Q

What is a turn buckle

A

mechanical screw device consisting of two threaded terminals and a threaded barrel. Turnbuckles are fitted in the cable assembly for the purpose of making minor adjustments in cable length and for adjusting cable tension
Never lubricated
Threads must be equally engaged

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12
Q

Locking

A

Clip type
When the tension is correctly adjusted, the two-piece clips are inserted into
a groove in the turnbuckle body and the terminal end on the cable. The two pieces are then clipped together through the hole in the barrel.

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13
Q

Compensation devices

A

A cable tension regulator is a mechanical device which, when fitted in a
cable system, allows the cables under all conditions of temperature change and structural deflection to take up and let out equally on each side of the circuit, thus maintaining uniform tension

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14
Q

Flexible remote cable systems

A

Manually operated from flight desk operating such things as trim tabs brake control vales engine controls
Can be bent

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15
Q

Types of cable and control method

A

Teleflex

Bowden

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16
Q

Teleflex

A

Cable
Pull and punch
Helix raped around cable engaging with gear teeth on control wheels
Can be left or right hand winding

17
Q

Types of teleflex

A

DS 23/2 has a left hand flex winding
DS 380 has a right hand flex winding
DS 169330 has a left and flex winding , can be used in hot areas

18
Q

End fitting single entry

A

Limited to 270 degrees of travel

Minimum of 40 degrees engagement at all times

19
Q

Double entry unit

A

Greater travel can be made

Angles 90 , 120 or 180 travel angle

20
Q

Anti torsion

A

Waisted

Prevent cable from twisting during operation

21
Q

Straight lead unit

A

Support

Not suited for heavy load

22
Q

Junction box

A

Used to reverse the direction of travel of the control cable
Branch a run control to operate two components

23
Q

Sliding end fittings

A

Used in lieu of wheel units when it is not necessary to covert pull / push movement

24
Q

End fittings

A

Guide tube in fork eye ball joint internal or existing threaded fitting
Attached my collet attachment or a spring and plug

25
Swivel joint
Installed where the rotery movement of the control lever at the receiving end dose not exceed 90 Consists of a ball and Scocket connection inside the housing
26
Distributed box
Cables to teleflex to screw jacks | Rotary to linear for trim tabs in conjunction with a torsion drive
27
Conduit connectors
Nipples types connector Clamp connector Similar to all-meal couplings but without and olive
28
Quick break unit
Various types installed in control systems | Facilitate the removal of components without disturbing the control
29
Bowden cables
``` Cable pull only Light loads Return via a spring Housed within a conduit Close coil wire Cotton braided Waterproof coating ```
30
Cable nipples
Brass nipples soldered or staged to cable Spherical Trunnions Plain End fittings are transmitting end of the cable The rotate end passes through an adjustable stop Spring loaded to return at either end
31
Adjustable stops
Remote end of cable passses through a plain stop Hexagonal headed screw drilled to allow the cable to pass Each screw is counter bound to receive the potential gap Stop fitting to remote end of cable
32
Connectors
Cable connector -cant use with a conduit | Control connector - used for joining Bowen controls