6.10 Flashcards
Strand
Made of wires twisted together
Cable
Made of strands twisted together
What forces to Cables and Pulleys transmit
Tension and Pulling
What device is used to keep tension in a Single cable system
Spring Loaded Device
What is Preforming
Bending of strands to there position in a cable
What metals are Cables made from
Galvanised Carbon Steel
Stainless Steel
CRS
What kind of forces (stresses) act on a cable
Tension Stress and Bending
What is Tensile Strength of a Cable Dependent on
Size
Material
Construction
Explain Cables looses strength due to bending
The inability for strands and wires to adjust themselves when the cable is bent
Explain Fatigue sue to bending in Cables
Small cracks form under bending loads
Eventually causes Fatigue failure
Wear of a Cable is determined by
Outer Wire Size
Composition
Construction
Larger Outer wires have
More wear resistance
Misaligned Pulleys will cause an increase in
Cable Wear
What effect will stretching of a cable have on output
Produce an Uneven Delayed and Reduced Output
Structural Stretch
Core Compression
Elastic Strecth
Elongation of Wires
Elastic Limit of Stainless Steel Cable
60% of Breaking Force
Elastic Limit of Galvanised Steel Cable
50% of Breaking Force
How many strands 7 x 19
7
How many wires in a 7 x 19
19 wires
Smaller Wires means
More Flex
LockClad Cables
Twisted Steel wire with Aluminium tube around it
Same coefficient of expansion as fuselage
What do turnbuckles do
Adjust Cable Tension and Length
Turnbuckle LH thread indications
Knurl or Grove
How are Turnbuckles locked
Spring Clips
Lockwire
What conditions can alter the tension of a cable
Temp
Flexing of aircraft
Tension Regulator Purpose
Keep Tension in Tolerances
Broken Cable Compensator Purpose
Protect against Broken Cables
Fair leads Purpose
Prevent Chaffing when routing through Aircraft Structure
Max Deflection of a Cable in Fairlead
3 °
Quadrants and Drums
Input or Output of Cable Systems
Bowden Cables
Transmit force via inner cable in hollow housing
Lengthening Housing of Bowden Cables
Tightens Cable
Shortening Housing of Bowden Cable
Loosens Cable