Control Cables

Question 1

Control cables

Answer 1

Weight saving

Can be mended and routed any where

Question 2

What is cable made off

Answer 2

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

Question 3

What is a 7 x 7 cable

Answer 3

7 strains x 7 wires per strand

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

Question 4

What is the diameter of a 7 x 7 cable

Answer 4

3/32 inch

Question 5

What is the diameter of a 7 x 19 cable

Answer 5

1/8

Question 6

Cable tension

Answer 6

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

Question 7

Fair leads

Answer 7

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

Question 8

Pressure seals

Answer 8

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.

Question 9

Pulleys

Answer 9

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

Question 10

Gagging pin

Answer 10

Put in regulator to prevent it from moving

Question 11

What is a turn buckle

Answer 11

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

Question 12

Locking

Answer 12

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.

Question 13

Compensation devices

Answer 13

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

Question 14

Flexible remote cable systems

Answer 14

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

Question 15

Types of cable and control method

Answer 15

Teleflex

Bowden

Question 16

Teleflex

Answer 16

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

Question 17

Types of teleflex

Answer 17

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

Question 18

End fitting single entry

Answer 18

Limited to 270 degrees of travel

Minimum of 40 degrees engagement at all times

Question 19

Double entry unit

Answer 19

Greater travel can be made

Angles 90 , 120 or 180 travel angle

Question 20

Anti torsion

Answer 20

Waisted

Prevent cable from twisting during operation

Question 21

Straight lead unit

Answer 21

Support

Not suited for heavy load

Question 22

Junction box

Answer 22

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

Question 23

Sliding end fittings

Answer 23

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

Question 24

End fittings

Answer 24

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

Question 25

Swivel joint

Answer 25

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

Question 26

Distributed box

Answer 26

Cables to teleflex to screw jacks

Rotary to linear for trim tabs in conjunction with a torsion drive

Question 27

Conduit connectors

Answer 27

Nipples types connector
Clamp connector
Similar to all-meal couplings but without and olive

Question 28

Quick break unit

Answer 28

Various types installed in control systems

Facilitate the removal of components without disturbing the control

Question 29

Bowden cables

Answer 29

Cable pull only 
Light loads 
Return via a spring 
Housed within a conduit 
Close coil wire 
Cotton braided
Waterproof coating

Question 30

Cable nipples

Answer 30

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

Question 31

Adjustable stops

Answer 31

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

Question 32

Connectors

Answer 32

Cable connector -cant use with a conduit

Control connector - used for joining Bowen controls