A330 Landing Gear and Braking System

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Questions and Answers

What is the purpose of the lock stay in the NLG assembly?

It lowers the NLG when landing.

It keeps the drag stay straight when the NLG is extended. (correct)

It secures the NLG during takeoff.

It prevents the NLG from being extended.

What component can be installed at the center pivot point of the lock stay when the NLG is down locked?

A hydraulic lock

A ground lock pin (correct)

A safety bolt

An actuator pin

Which mechanism is used to prevent NLG doors from closing when the aircraft is on the ground?

Lock collars on the door actuators (correct)

Hydraulic pressure maintenance

Safety pins on the door hinges

Mechanical braces installed on the doors

In which aircraft family is the described NLG system used?

A330-200/300 family Signup and view all the answers

What additional feature did the briefing specify to prevent issues with the NLG doors?

Placement of lock collars Signup and view all the answers

What part of the NLG system holds the drag stay in alignment?

The lock stay Signup and view all the answers

Which engine model is specified in the NLG system overview?

RR Trent 700 Signup and view all the answers

When is it necessary to install a lock collar on the door actuators?

When the aircraft is on the ground Signup and view all the answers

What is the primary function of the parking brake system in an aircraft?

To prevent movement of the aircraft when parked Signup and view all the answers

Which hydraulic power is used to operate the parking brake system?

Blue hydraulic power Signup and view all the answers

What happens when the PARKing BRaKe handle is set to ON?

The parking brake control valve is activated Signup and view all the answers

In emergency situations, how can the parking brake system be used?

To stop the aircraft when no other braking mode is available Signup and view all the answers

What does the triple pressure indicator display?

The available pressure from the brake accumulators and pressure on MLG brakes Signup and view all the answers

What does the automatic selector prioritize when both hydraulic systems are available?

Green hydraulic system Signup and view all the answers

What is the maximum pressure limit set by the system for the aircraft brakes?

2,580 psi Signup and view all the answers

What occurs when the PARK BRK handle is set to OFF?

The parking brake control valve cuts the blue pressure Signup and view all the answers

What does the BSCU control in relation to the brakes?

Modulates the hydraulic pressure sent to the brakes Signup and view all the answers

For how long can the accumulators maintain the brakes on?

Twelve hours Signup and view all the answers

Which component measures hydraulic pressure in the system?

Pressure switch Signup and view all the answers

How does the system ensure anti-skid protection?

Using feedback from wheel rotation speed Signup and view all the answers

In the context of the braking system, what does 'A/SKID' stand for?

Anti-Skid Signup and view all the answers

What type of braking system is described as an alternate braking system?

Hydro mechanical braking system Signup and view all the answers

What is included in the Main Landing Gear (MLG) assembly?

MLG leg assembly Signup and view all the answers

Which system supplies data to the BSCU for processing?

Pressure switch Signup and view all the answers

Which part of the Main Landing Gear retracts inboard into the fuselage?

MLG leg assembly Signup and view all the answers

What is the primary function of the bogie beam assembly in the MLG?

To align the wheels of the landing gear Signup and view all the answers

What is the primary function of the servo valve in the braking system?

To modulate hydraulic pressure according to demand Signup and view all the answers

How is the data related to wheel rotation speed used in the braking system?

For computing anti-skid protection Signup and view all the answers

What is NOT a part of the Main Landing Gear (MLG)?

Nose wheel steering Signup and view all the answers

Which feature is related to the normal operation of the Main Landing Gear?

Normal Extension and Retraction D/O Signup and view all the answers

What happens to the blue hydraulic pressure when the green system is active?

It is cut off by the automatic selector Signup and view all the answers

Where does the Main Landing Gear (MLG) reside when retracted?

In the fuselage and wing Signup and view all the answers

Which of the following is a special feature of the landing gear system?

Landing Gear System Base Maintenance Signup and view all the answers

What does the acronym D/O refer to in the context of landing gear operations?

Deployment Operations Signup and view all the answers

What component is essential for the alignment of the bogie in the MLG?

Bogie alignment pitch trimmer Signup and view all the answers

Which procedure involves the use of hydraulic systems in the landing gear?

Normal Extension and Retraction D/O Signup and view all the answers

What is the primary function of the hydraulic fluid in the shock absorber?

To transmit load and absorb compression Signup and view all the answers

What happens to the volume in the cylinder during the compression stroke?

It decreases, increasing pressure in the piston chamber Signup and view all the answers

How does the design of the cylinder contribute to the operation of the shock absorber?

It has a wear-resistant surface at the bearing interfaces Signup and view all the answers

What effect does the slow recoil stroke have on the aircraft during landing?

It stabilizes the aircraft upon touchdown Signup and view all the answers

During the extension of the cylinder, what happens to the flow from the recoil chamber?

It decreases due to closure of ports in the piston Signup and view all the answers

What is the main purpose of the hydraulic system in relation to the pitch trimmer during the landing gear operations?

To maintain the required geometry of the links Signup and view all the answers

What effect does the shortening mechanism have on the MLG during the retraction process?

It allows the gears to fit into the available space in the bays Signup and view all the answers

What components connect the main fitting to the bogie beam?

Two upper and one lower articulated links Signup and view all the answers

During what phases does the hydraulic system need to supply pressure to the pitch trimmer?

Retraction and landing phases Signup and view all the answers

What is NOT a part of the main features controlled by the green hydraulic system?

Braking system operations Signup and view all the answers

What does the retraction sequence of the MLG involve in terms of mechanical adjustments?

Shortening the overall length of the landing gear Signup and view all the answers

What is required to ensure the links in the landing gear system remain stable during operation?

Continuous pressure supplied by the green hydraulic system Signup and view all the answers

Which system is involved in maintaining the geometry of the links during the landing gear operation?

The green hydraulic system Signup and view all the answers

What happens to the pressure in the piston chamber during the compression stroke of the shock absorber?

It increases as the volume in the cylinder decreases Signup and view all the answers

Which component of the shock absorber directly participates in the compression of the gas?

The piston Signup and view all the answers

What is the primary purpose of the wear-resistant surface on the external face of the cylinder?

To withstand the loads during landing, takeoff, and taxi Signup and view all the answers

As the cylinder of the shock absorber extends, what occurs at the piston seal?

It closes ports to decrease flow from the recoil chamber Signup and view all the answers

What role does hydraulic fluid play in the functioning of the shock absorber during compression?

It transfers load to the gas within the shock absorber Signup and view all the answers

What must be ensured regarding the green hydraulic system before activating the MLG seal changeover valve?

It must be depressurized. Signup and view all the answers

What safety measure is recommended before opening the related circuit breakers when working on the landing gear system?

Open and safety tag the related circuit breakers. Signup and view all the answers

What is the primary step to be performed before commencing work on the landing gear system?

Ensure the wheel well doors are closed. Signup and view all the answers

Which action should be taken with regard to the warning and safety precautions before activating the MLG seal changeover valve?

Review and obey them diligently. Signup and view all the answers

What is the status of the hydraulic system described in the maintenance procedures for the landing gear?

System should not be pressurized. Signup and view all the answers

In the context of maintenance for the landing gear system, what is the correct term for the valve mentioned in the procedures?

Seal changeover valve. Signup and view all the answers

Why is it necessary to safety tag the circuit breakers in the landing gear maintenance procedure?

To avoid accidental resetting. Signup and view all the answers

What could be a consequence of not following the general warnings and safety precautions when maintaining the landing gear system?

Potential for accidents and injuries. Signup and view all the answers

What is the correct sequence for closing the landing gear doors?

Remove the safety devices, push the door-opening handle upward, and close the access panel. Signup and view all the answers

What must be done to the ground door-opening handle before dispatching the aircraft?

It should be secured with a safety pin. Signup and view all the answers

What precaution should be taken regarding the hydraulic system while performing maintenance on the landing gear?

The green hydraulic system must be de-pressurized. Signup and view all the answers

Which item should be removed after ensuring all safety precautions are followed?

All of the above Signup and view all the answers

What is the required condition of the tires before measuring their inflation pressure?

They must be cold. Signup and view all the answers

Before dispatching, which maintenance step must be confirmed for the MLG maintenance doors?

They must be closed and secured. Signup and view all the answers

Which safety device is mentioned as being removed during the landing gear maintenance process?

Uplocks Signup and view all the answers

In the context of the maintenance protocol, what does the access panel serve?

To facilitate the closing of the landing gear doors. Signup and view all the answers

What does the term 'de-pressurize' refer to in the maintenance of the landing gear?

To lower the hydraulic pressure for safety. Signup and view all the answers

What action is taken to engage the uplocks when closing the doors?

Push the handle upward before closing. Signup and view all the answers

What must be done to the doors before starting maintenance tasks inside the landing gear bay?

Safety sleeves need to be fitted on the door actuators. Signup and view all the answers

What should be ensured regarding the wheel chocks before maintenance begins?

They need to be placed in position to prevent movement. Signup and view all the answers

What is the purpose of installing ground safety lock pins?

To secure the down lock mechanisms. Signup and view all the answers

When can the maintenance area be closed after servicing?

If no other hydraulic servicing tasks are required. Signup and view all the answers

Which of the following is critical for the safety of maintenance personnel during the cleaning process?

Using solvents and cleaning agents in well-ventilated areas. Signup and view all the answers

What must be done with tools used during the maintenance procedure?

They need to be removed from the area. Signup and view all the answers

What could be a potential danger if proper precautions are not followed during hydraulic servicing?

Movements of the aircraft could be dangerous. Signup and view all the answers

Which component is essential to prevent the landing gear doors from closing improperly during maintenance?

Safety sleeves on door actuators Signup and view all the answers

What should be ensured about the hydraulic systems prior to beginning maintenance on the landing gear?

They must be deactivated. Signup and view all the answers

What are the safety devices installed on the landing gear doors supposed to prevent?

The doors from closing during maintenance Signup and view all the answers

What is the primary function of the wheel chocks during maintenance?

To restrict unnecessary movement of the aircraft. Signup and view all the answers

What should be done to ensure a safe working environment when using cleaning agents?

Use materials in a well-ventilated area. Signup and view all the answers

What precaution is necessary during the maintenance of the landing gear system?

Secure the down lock mechanisms with safety devices. Signup and view all the answers

Why is it important to close the maintenance area once servicing is complete?

To prevent unauthorized access to a potentially hazardous area. Signup and view all the answers

Study Notes

Landing Gear System Overview

The A330-200/300’s main landing gear (MLG) retracts inward into the fuselage and wing.
The MLG consists of a side stay assembly, MLG leg assembly, bogie alignment pitch trimmer, and bogie beam assembly with upper and lower links.
The nose landing gear (NLG) lock stay holds the drag stay straight when the NLG is extended.
A ground lock pin locks the NLG in a down position.
NLG doors have a lock collar to prevent closure on the ground.

NLG Door System

A pressure switch monitors hydraulic pressure and sends data to the brake system control unit (BSCU).
An automatic selector prioritizes the green hydraulic system for normal braking and cuts the blue hydraulic pressure.
The servo valve, controlled by the BSCU, manages hydraulic pressure sent to the brakes based on pedal input and anti-skid (A/SKID) protection.
Wheel speed and brake pressure are sent to the BSCU for braking and A/SKID calculations.

Braking System

The alternate braking system is a hydromechanical system for parking.
The alternate braking system is electrically controlled and operated by blue hydraulic power or blue accumulator pressure.
The parking brake control valve connects blue hydraulic pressure when the parking brake handle is set to ON.
A dual shuttle valve connects blue pressure to the brakes when activated.
A triple pressure indicator displays accumulator and brake pressure, which is limited to 2.580 psi.
Accumulators hold enough pressure to maintain the brakes for at least 12 hours.

Shock Absorber

The shock absorber is a capsule type with a sliding tube.
The shock absorber is oleo-pneumatic (oil and gas) and installed in the main fitting.
The hydraulic fluid and gas in the shock absorber absorb landing and taxi loads.
The cylinder moves up around the piston during compression, increasing pressure in the piston chamber.
Hydraulic fluid flows into the piston chamber, compressing the gas.
As the cylinder extends, seals close ports in the piston, slowing the recoil stroke.

Main Landing Gear (MLG) Alignment Pitch Trimmer

Continuous pressure from the green hydraulic system is delivered to the pitch trimmer during retraction, TO, and landing phases.
This maintains the geometry of the links between the main fitting and the bogie beam.

MLG Shortening Mechanism

The shortening mechanism retracts the MLG during retraction, reducing its overall length to fit within the available space in the bays.

Maintenance - Installation of Safety Devices on L/G

Safety sleeves must be fitted on the door actuators before maintenance is commenced within the L/G bay.
After completing maintenance tasks, remove the safety devices from the door actuators, close the doors, and engage the uplocks.

MLG Wheel Brake Deactivation

The process involves depressurizing the green hydraulic system, closing the wheel well doors, and safety tagging the related circuit breakers.

Shock Absorber

The shock absorber incorporates a sliding tube and is an oleo-pneumatic unit installed within the main fitting.
The shock absorber dissipates energy during landing, takeoff, and taxiing.
The shock absorber's cylinder moves up towards the piston during compression, decreasing the volume of the cylinder and increasing pressure in the piston chamber.
The pressure within the piston chamber then returns hydraulic fluid to the cylinder chamber.
During extension, seals close the ports in the piston, reducing fluid flow from the recoil chamber and slowing the recoil stroke.

MLG Seal Changeover Valve

The changeover valve governs the fluid flow between the cylinder and recoil chambers within the shock absorber, influencing the compression and expansion of the unit.

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Description

Explore the intricacies of the A330-200/300 landing gear system, including its main and nose landing gear components. This quiz also covers the hydraulic and braking systems critical for safe aircraft operation. Test your knowledge on these essential aviation systems!