7.13 Flashcards
What is an advantage of cable lines over other mechanical actuators?
Predominantly weight saving.
Cables used in aircraft normally consists of individual cable wires with minimum tensile strength of what?
1200 N/mm (and breaking elongation of 2-7%)
What do the numbers mean in a 7x19 cable?
7 strands, 19 wires.
What size do the wooden drums need be which cables are supplied on?
40 times the diameter of the individual cable itself.
How many times the cable diameter should lengths of cable be coiled into radii of?
Less than 50 times. (And diameter of less than 150mm)
What are the permitted limits for broken wires for class 7x19 cable?
6 broken wires in same one inch (worn to 50% or more of their diameter) with not more than 3 broken wires for each strand.
What are the permitted limits for broken wires for class 7x7 cable?
3 in the same inch (worn to 50% or more of their diameter), no more than 2 for each strand.
How many broken wires are allowed for lengths of cables which go through fairleads and pressure seals or touch pulleys?
No more than 3.
If a wire is worn to more than 60% of its diameter what it is called?
A broken wire.
For a pulley with diameter less than 80mm, what must the wobble not be more than?
0.25mm
For a pulley with diameter of 80mm or more, what must the wobble not be more than?
Not more than 0.30mm
On a cable swaging roller, what is the designation for the rolling disc with 2 PINS?
LOWER
On a cable swaging roller, what is the designation for the rolling disc with 2 HOLES?
UPPER
What are rolled on balls and terminals checked for sufficient tensile strength with?
Cable Terminal Pull Tester
How long should the full test load on a Cable Terminal Pull Tester be applied for?
5 seconds.
How is a left hand thread turnbuckle marked?
With a groove.
What is a tensiometer used for?
Rigging control cables.
How often must tensiometers be calibrated?
Every year.
What is a No 2 cable?
Left hand helix winding.
Why is No 380 cable advantageous?
Improved efficiency and reduction in backlash.
Right hand helix winding
In what areas is a DS 169330 cable used?
Hot areas.
What can conduits not be bent in smooth curves to radii less than?
3 inches.
What can a flexible conduit not be bent less than?
9 inches.
What is the rotary travel of unit limited to on a single-entry unit?
270 degrees.
How long must a load be applied for when measuring tension?
5 minutes.
How many times should the tension be checked on a tensiometer?
3 or 4.
What are 2 types of conduit?
Nipple type connector
Clamp connector
Why are quick break units advantageous?
Facilitate removal of components without disturbing the control.
What only operation is a Bowden cable for?
Pull operation.
What coating is finished on a Conduit?
Black waterproof.
What is a junction box used for?
Connecting a single cable to 2 others where there are 2 components to be operated by a single control.
What are the 2 types of connectors used?
Control connector (for joining 2 Bowden controls) and cable connector.
For conduits longer than 2 ft, how often must they be supported?
Every 12 inches.
