Control Cables Quiz EASA

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Questions and Answers

What indicates a turnbuckle is not in safety?

When a wire of the same diameter as the inspection hole can be passed through. (correct)

When a small diameter wire can be passed through the inspection hole.

When the inspection hole is larger than the wire.

When you can see daylight through the hole.

How can you confirm a turnbuckle is in safety?

Ensure the turnbuckle cannot be turned with force.

Inspect the turnbuckle's exterior for paint chipping.

Count the threads showing or use the inspection hole. (correct)

Confirm no threads are showing at either end.

How are British aircraft cables primarily classified?

By their breaking load measured in feet.

By their tensile strength in Newtons.

By their breaking load in hundredweights. (correct)

By their diameter and breaking load in hundredweights.

What is a primary advantage of using cable control systems over other types?

They are strong and lightweight. Signup and view all the answers

What method is commonly used to lock turnbuckles?

By using locknuts and wire. Signup and view all the answers

What is the function of a cable tension regulator?

To maintain consistent cable tension. Signup and view all the answers

Which of the following is not a common method to check cable safety?

Looking for cracks in the surrounding structure. Signup and view all the answers

What type of nut is primarily used in securing turnbuckles?

Locknuts. Signup and view all the answers

What materials are commonly used in the manufacturing of pulleys?

brass and phenolic resin Signup and view all the answers

Which component in a Teleflex flexible control system allows movement in two directions?

high tensile steel wire with a right or left hand helix Signup and view all the answers

What is the primary function of a cable tension regulator in a flying control system?

to adjust for temperature variations affecting cable tension Signup and view all the answers

How are aircraft flying control cables classified?

by the minimum breaking load or diameter Signup and view all the answers

What does a 7 * 7 cable configuration indicate?

7 stranded wires, each containing 7 wires Signup and view all the answers

What is the purpose of tension regulators in aircraft with fully metal bodies?

to maintain consistent cable tension Signup and view all the answers

What is the minimum size of cable permitted for primary control systems in aircraft?

1/8 inch Signup and view all the answers

Which method is employed to change the direction of a control cable?

Pulleys Signup and view all the answers

Under what condition should a flight control cable be replaced?

if individual wires show blending Signup and view all the answers

What is a key factor in correctly tensioning cables?

Having control surface locks in to support weight and adjust turnbuckles equally. Signup and view all the answers

How is the safety of British turnbuckles typically checked?

Attempting to pass a hardened pin probe through the inspection hole. Signup and view all the answers

What signifies that turnbuckles are installed correctly?

The inspection hole is blind or the required number of threads are showing. Signup and view all the answers

What represents the correct method for measuring the diameter of a cable?

The overall diameter of the entire cable. Signup and view all the answers

What does a 9 * 16 cable specification indicate?

9 strands each composed of 16 wires. Signup and view all the answers

Turnbuckles are primarily used to adjust what aspect of cables?

Minor tension on the cable. Signup and view all the answers

What is the condition for a turnbuckle to be considered safe?

The witness hole is covered or the amount of threads showing at the cable end is correct. Signup and view all the answers

Which method is used to safety lock a turnbuckle?

Using lock nuts and safety wire locking. Signup and view all the answers

Spring locking clips for turnbuckles can be used on which types of cables?

All flying control cables. Signup and view all the answers

What is the purpose of the small hole on a swaged turnbuckle?

To check if the correct amount of cable has been inserted before swaging. Signup and view all the answers

When checking the safety of turnbuckles, what tool should be used?

Wire the same diameter as the inspection hole. Signup and view all the answers

Cable minimum breakage strain is measured in what for British and American standards?

Hundredweight for British, c.s.a. and pounds for American. Signup and view all the answers

What does wear on one side of a pulley indicate?

The cable is misaligned. Signup and view all the answers

In a 7x7 cable, each strand consists of how many wires?

Seven wires. Signup and view all the answers

Cable stops are typically manufactured from which material?

Copper. Signup and view all the answers

Study Notes

Turnbuckles and Safety

A turnbuckle is not considered safe when a wire of the same diameter as the inspection hole can pass through.
Safety checks for a turnbuckle include using the inspection hole or counting visible threads.
British turnbuckles are inspected for safety by attempting to pass a hardened pin probe through the inspection hole.

Cable Specifications

British aircraft cables are classified by breaking load in hundredweights.
Cable sizes are measured by overall diameter; this includes all wires in the configuration.
A 9x16 cable means 9 strands of 16 wires each.

Cable Tension and Maintenance

Cable tension is maintained using a cable tension regulator to compensate for various conditions.
To correctly tension cables, it's beneficial to have control surface locks to support weight and adjust turnbuckles equally.
Aircraft flying control cables are classified by minimum breaking load or diameter.

Materials and Manufacturing

Cable stops are typically made from copper.
Pulleys can be manufactured from brass and phenolic resin.

Control Systems

Cables are favored in control systems due to their strength and light weight, providing a mechanical advantage over push/pull systems.
Teleflex control systems utilize high tensile steel wires with a helical wire for operation in two directions.
Pulleys are used to change the direction of a control cable effectively.

Usage Guidelines

Turnbuckles can adjust minor tension on cables and must be secured with locknuts and safety wire.
Spring locking clips for turnbuckles can be used on all flying control cables.
The smallest size cable permissible in primary control systems is 1/8 inch.

Cable Construction

A 7x7 cable consists of seven strands, each containing seven wires, resulting in a total of 49 wires.
Changes in direction of a control cable are accomplished using pulleys.

Replacement Criteria

A flight control cable requires replacement if single wires are blended together, indicating significant wear or damage.

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Description

Test your knowledge on control cables with this quiz focused on turnbuckles and safety criteria. Understand when a turnbuckle is considered unsafe based on inspection hole measurements. Answer the questions to enhance your understanding of control cable applications.