6.10- Control Cables Flashcards
What is the standard minimum tensile strength of aircraft control cables?
1200N/mm² at a breaking elongation of 2-7%.
What are steel wires twisted into?
Strands which are then twisted into cables.
Non flexible cable is normally what strand x wires?
1 x 19
What is 1 x 9 cable generally used for?
Bracing, drag and anti-drag wires.
What is 7x7 cable used for?
Trim tab controls, engine controls and indicator controls.
Where is 7x19 cable used?
Primary control systems and pulley systems.
How are metal cable terminals fitted to cables?
Swaged by plastic deformation of the hollow shank.
What are the four types of cable terminals?
Ball (single or double shank)
Stud (short or long thread)
Fork
Eye
What is a fairlead?
Used to guide control cables to prevent contact with the structure.
How does a pressure seal work with a cable?
The seals are filled with grease which allows the cable to pass freely with no loss of pressurisation.
What does a turnbuckle assembly consist of?
Two threaded terminals and a threaded barrel.
Why are turnbuckles fitted into a cable system?
To make minor adjustments in length or tension.
How is the barrel with the left hand thread be identified in a turnbuckle.
By a groove or knurl around that end of the barrel.
What does a cable tension regulator ensure?
Maintains uniform tension despite temperature and condition change.
How many springs can a compensating unit of a tension regulator be manufactured with?
1 or 2.
What is important to ensure before working on a control run?
The cable tension regulator is locked out or ‘snubbed’.
What is the benefit of using a cable and conduit over levers, rods, chains etc.
They can be bent to pass through the strucutre.
What are teleflex and bowden and example of?
Cable and conduit control.
What does a teleflex control cable consist of?
Tension wire wound in a continuous left or right helix which can engage with gear teeth at the ends of the cable.
What three types of teleflex cable are available for aircraft use?
DS 23/2 (known as 2)
DS 380
DS 169330.
What is the minimum breaking load of DS 23/2 teleflex?
204kg.
What direction is the helix of DS 23/2?
Left hand.
What differs DS380 from DS 23/2?
Fitted with high tensile steel inner wire instead of compression wire.
What direction of helix is DS380 and what is the minimum breaking load?
Right hand
454kg
What is the only thing that makes DS 169330 different to DS380.
The spacer wire has been removed from the design.
Where would you use DS 169330?
Hot areas of the aircraft up to 350 degrees C.
When is a sliding end fitting used?
Where it is not neccesary to convert the push pull into a rotary movement.
What are the limitations of a single entry unit?
270 degrees of travel and minimum 40 degrees of engagement.
What is an anti torsion tube and where would you find one?
Prevents the cable turning in the conduit and can be found in the place of a spent travel tube.
What is a straight lead unit?
Where the cable passes straight through and only engages in a few teeth.
Where can swivel joints be installed?
Where the rotary movement of the control lever doesn’t exceed 90 degrees.
How can damage to rigid conduit be repaired?
Insert a new section
How must the cable be cleaned if it becomes dirty?
Cleaned in kerosene, wiped dry with a non fluffy cloth and re-lubricated.
When fitting a cable what excess must you cut it with?
2 inches.
Is a bowden cable push or pull?
Pull
Push is provided with a spring.
