Aircraft Brake Wear Pin Test Quiz: Prevent Wear and Pass

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Questions and Answers

What is the purpose of the anti-skid control unit in an aircraft?

To deactivate the wheel sensors

To reduce hydraulic pressure to prevent or relieve skidding (correct)

To activate the skid warning signals on the wheels

To increase hydraulic pressure to the brakes

Where is it common for the anti-skid control unit to be located in an aircraft?

In the avionics bay (correct)

In the cockpit

In the engine compartment

In the cargo hold

Which component of the anti-skid system is responsible for determining if a skid is imminent or occurring?

Wheel sensor (correct)

Control valve

Drive coupling

Wheel transducer adapter

What is the purpose of monitoring the deceleration rate of each wheel?

To prevent the brakes from locking and causing a skid Signup and view all the answers

What happens if the anti-skid control unit receives signals indicating a skid is occurring?

It sends a signal to relieve hydraulic pressure to that brake Signup and view all the answers

When does the anti-skid system return to manual braking mode?

For slow taxi and ground maneuvering Signup and view all the answers

Which part of the aircraft houses the components of the anti-skid system such as wheel sensors, control units, and control valves?

Avionics bay Signup and view all the answers

What are the three main components found in most anti-skid systems?

Wheel speed sensors, antiskid control valves, and a control unit Signup and view all the answers

Where is the stator of an anti-skid wheel sensor typically mounted?

In the axle Signup and view all the answers

How do some anti-skid systems provide automatic braking?

By turning on the auto brake system Signup and view all the answers

What is the main concern regarding aircraft brakes overheating?

It can damage and distort brake parts Signup and view all the answers

Where are wheel speed sensors typically located in an aircraft equipped with an anti-skid system?

On each wheel with a brake assembly Signup and view all the answers

What is the protocol for brakes when they show signs of overheating?

They must be removed from the aircraft and inspected Signup and view all the answers

Why are ground safety switches wired into the circuitry for anti-skid and auto brake systems?

To prevent miscommunication between the pilot and the system Signup and view all the answers

What is the consequence of not replacing all the seals during a post-overheat brake inspection?

Potential brake failure under high-pressure braking Signup and view all the answers

What could cause brake drag in an aircraft?

Linings not retracting from the brake disc Signup and view all the answers

Why is it important to check the brake housing for cracks, warping, and hardness?

To prevent brake failure under high-pressure braking Signup and view all the answers

What must be done after reassembling a brake before installing it on an aircraft?

It should be bench tested for leaks and pressure tested for operation Signup and view all the answers

What causes brakes to chatter or squeal?

Misalignment of the disc stack Signup and view all the answers

Why does a warped disc in a multiple brake disc stack produce chattering and squealing?

It applies and removes the brake many times per minute Signup and view all the answers

What can result from uneven disc surfaces due to transfer of mix from one disc to another?

Chatter or squeal in the brakes Signup and view all the answers

Why is it important for a technician to investigate reports of brake chattering and squealing?

To identify and address potential brake issues Signup and view all the answers

What effect does vibration caused by brake chattering and squealing have on the landing gear system?

It leads to further damage of the landing gear system Signup and view all the answers

What is brake lining material made for?

To reduce friction during application of the brakes Signup and view all the answers

How can the amount of wear on brake linings be monitored?

By measuring the exposed wear indicator pin length Signup and view all the answers

What does a built-in wear indicator pin typically do?

Indicates when the linings need to be replaced Signup and view all the answers

Where is the wear pin measured on a Goodyear brake assembly?

At the nut of the automatic adjuster on the back side of the piston cylinder Signup and view all the answers

In what way can lining wear be measured on some brake assemblies that do not have a wear pin?

By measuring the distance between the disc and a portion of the brake housing when brakes are applied Signup and view all the answers

Why is it important to consult the manufacturer’s maintenance information regarding brake wear pin indicators?

To ensure correct measurement of lining wear Signup and view all the answers

Study Notes

Anti-Skid Control Unit

The anti-skid control unit is responsible for preventing wheel skid during landing by automatically controlling brake pressure.

Location and Components

The anti-skid control unit is commonly located in the aircraft's landing gear or wheel wells.
The aircraft's wheel wells house the components of the anti-skid system, including wheel sensors, control units, and control valves.
The three main components found in most anti-skid systems are wheel sensors, control units, and control valves.

Wheel Sensors and Skid Detection

The wheel sensor component is responsible for determining if a skid is imminent or occurring.
The stator of an anti-skid wheel sensor is typically mounted on the axle or hub of the wheel.

Braking Mode and Deceleration Rate

Monitoring the deceleration rate of each wheel helps detect potential skids.
If the anti-skid control unit receives signals indicating a skid is occurring, it will automatically reduce brake pressure to the affected wheel.
The anti-skid system returns to manual braking mode when the threat of skid has passed.

Automatic Braking and Brake Overheating

Some anti-skid systems provide automatic braking by applying equal pressure to all wheels.
The main concern regarding aircraft brakes overheating is that it can lead to brake failure or fire.
When brakes show signs of overheating, the protocol is to cool them down before further use.

Safety Features and Brake Maintenance

Ground safety switches are wired into the circuitry for anti-skid and auto brake systems to prevent accidental brake application on the ground.
Not replacing all seals during a post-overheat brake inspection can lead to brake failure.
Brake drag can be caused by worn or damaged brake components.
Checking the brake housing for cracks, warping, and hardness is important to ensure brake safety.
After reassembling a brake, it must be tested before installing it on an aircraft.

Brake Noise and Wear

Brake chattering and squealing can be caused by warped discs, uneven disc surfaces, or brake lining wear.
A warped disc in a multiple brake disc stack produces chattering and squealing due to uneven braking pressure.
Uneven disc surfaces can result in the transfer of mix from one disc to another, leading to brake noise.
Brake lining material is designed to wear down over time.
The amount of wear on brake linings can be monitored through built-in wear indicator pins or measuring lining thickness.
A built-in wear indicator pin typically extends when the lining wear reaches a certain level.
On a Goodyear brake assembly, the wear pin is measured at the outer edge of the brake assembly.
Lining wear can be measured on some brake assemblies that do not have a wear pin by measuring the lining thickness.
It is important to consult the manufacturer's maintenance information regarding brake wear pin indicators to ensure proper brake maintenance.

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Description

Test your knowledge on inspecting aircraft brakes, including checking brake lining wear, air in the brake system, fluid quantity level, leaks, and bolt torque. Learn about monitoring brake lining wear to ensure effective braking.

Aircraft Brake Inspection Quiz