7.13 Flashcards
Whats the two most common control cables made from ?
Carbon steel
Stainless steel - more expensive and has lower tensile strength but longer service life.
What’s the 3 methods of swaging compression fittings onto cable ?
Kearney
Hydraulic press
Nicopress
( manufactured with AN standards )
Explain how the Kearney swagger works ?
Metal of terminal is squeezed engaging terminal onto the cable.
( terminal cannot be separated. )
What’s the maximum diameter of a cable which can have a terminal fitting swaged onto it ?
3/8
What can over swaging cause ?
Work hardening
How much percent is a cable loaded to its breaking strength ?
60 %
What the sleeve used on the nicopress swage fitting made from ?
Copper sleeve
How much cable should be visible beyond the sleeve on a nicopress swaged fitting ?
1/8
How much does a nicopress termination produce of the cable strength ?
100%
What can you apply to the cable after being nicopressed to show if its slipped ?
Paint.
What percentage of wear on the cable will you begin to see the wires blending together ?
40-50%
Why is a fair lead used ?
Use when cable will likely contact the structure
Should a fair lead be used to change direction of a cable ?
No
What are pressure seals filled with to allow cables to run smoothly and not cause a pressurisation leak when running through bulkheads ?
Grease
What stops a cable from jumping out of a pulley
Clevis pin guarded with a split pin.
How long should the load be applied for when tensioning cable ?
5 minutes.
Whats the accuracy of a tensiometer ?
98%
What does the inner cable of a Bowden cable run through ?
Conduit
Note : Bowden cables amused on remote control systems. ( engine throttle, propeller pitch etc )
What are Bowden control cables normally constructed from ?
Stainless steel
How many directions does a Bowden cable operate in ?
On direction ( pull )
How can a Bowden cable be adjusted ?
Adjustable stop
Double ended stop
What’s used to connect one cable to more than one cable ?
Junction box
( if connecting a one-to-one cable join, than use a cable connector barrel )
Whats the 3 types of hand levers ?
Thumb type
Ratchet type
Plain type
How many directions does a teleflex cable travel in ?
2
Push and pull
Where would you use a teleflex cable ?
Throttle lever to an engine fuel control system.
Note : teleflex cables are stronger than Bowden cables.
Whats the angle which a teleflex cable wraps around the pinion of a single entry unit and double entry unit ?
Single entry - 40 degrees
Double entry - 180 degrees
How often does the manufacture recommend you inspect the control cables ?
Every 100 hours.
