Aircraft Landing Gear System Overview

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Questions and Answers

What is the primary function of the twin, double acting hydraulic actuators in the nose landing gear system?

To absorb shocks during landing

To pivot the nose wheels for steering (correct)

To retract the landing gear after landing

To extend the landing gear during flight

Where is the lock stay assembly installed within the nose landing gear system?

Between the shock absorber and the axle

Between the main fitting and the center pivot point of the drag stay (correct)

At the steering assembly of the main fitting

Adjacent to the hydraulic actuators

How is the landing gear system operated during its extension and retraction sequence?

Mechanically operated by levers

Manually activated by pilots

Electrically powered hydraulic system

Hydraulically operated (correct)

What role does the shock absorber play in the landing gear system?

It absorbs impact from landing to enhance comfort Signup and view all the answers

Which component is part of the sliding tube assembly in the landing gear leg?

Axle Signup and view all the answers

What is the main purpose of the hydraulic actuators in the nose landing gear?

To allow the nose wheels to pivot for steering Signup and view all the answers

What does the NLG lock stay contribute to in the landing gear system?

Maintains the position of the drag stay during operation Signup and view all the answers

During what conditions does the hydraulic operation of the landing gear system occur?

Throughout the entire flight cycle as needed Signup and view all the answers

What is the primary function of the MLG doors?

To protect bay equipment from airflow during flight Signup and view all the answers

How are the MLG doors operated?

Hydraulically through a system of actuators Signup and view all the answers

What part connects the hinge of the MLG door to the MLG leg?

Adjustable rod Signup and view all the answers

Where does the Nose Landing Gear (NLG) retract?

Into the NLG bay Signup and view all the answers

Which component can be installed on the MLG door actuator to prevent closure while on the ground?

Lock collar Signup and view all the answers

What is NOT a main part of the Nose Landing Gear assembly?

Brake selector valve Signup and view all the answers

What mechanism moves the hinged MLG door during operation?

Adjustable rod Signup and view all the answers

Which of the following best describes the role of steering actuators in the Nose Landing Gear?

They manage the articulation of the nose wheel direction Signup and view all the answers

What function does the adjustable rod serve in the MLG door operation?

Connects the MLG leg to the hinged door Signup and view all the answers

When are the MLG doors designed to close?

During flight to protect the equipment Signup and view all the answers

What is the primary function of the Braking and Steering Control Unit (BSCU) in normal braking manual mode?

To energize the normal selector valve and connect hydraulic power Signup and view all the answers

Which of the following components is NOT directly involved in the normal braking process on the ground?

Aft landing gear doors Signup and view all the answers

In the landing gear system, which type of actuation is used for the forward doors?

Hydraulic actuation Signup and view all the answers

What role do adjustable rods play in the landing gear system?

They connect the rear doors to the NLG leg Signup and view all the answers

Which statement best describes the function of anti-skid protection in aircraft braking systems?

It prevents wheel lock-up during braking to maintain control Signup and view all the answers

How does the hydraulic system influence the landing gear mechanism?

By energizing the selector valves for the braking system Signup and view all the answers

When are the aft doors and the fixed fairing of the NLG bay operated?

When lowering the landing gear Signup and view all the answers

Which aspect of the landing gear system is influenced by the normal selector valve?

The connection of hydraulic power to the braking system Signup and view all the answers

What is the mode of operation for the braking system when the aircraft is on the ground and using manual inputs?

Manual mode with hydraulic assistance Signup and view all the answers

What is the primary purpose of the fixed fairing in the NLG system?

To reduce aerodynamic drag during flight Signup and view all the answers

Study Notes

Landing Gear System

The Main Landing Gear (MLG) is hydraulically operated during the normal extension/retraction sequence
The L/G leg has a main fitting with a sliding tube assembly
The sliding tube assembly includes the axle and a shock absorber with a wheel steering assembly
The nose wheels are steered by twin, double acting hydraulic actuators which pivot on attachments on the main fitting

Nose Landing Gear

NLG retracts forward into the NLG bay
NLG consists of a:
- lock stay assembly
- NLG leg assembly
- steering actuators
NLG bay is closed by 4 doors and a fixed fairing
The forward doors are hydraulically operated and close inward at the front of the bay
The aft doors and the fixed fairing are mechanically operated
Adjustable rods connect the rear doors to the NLG leg
The fixed fairing is installed at the rear of the NLG leg

Main Landing Gear Doors

MLG doors are hydraulically operated
Each main door is hinged at the keel beam and closes outboard
The fairing door is attached to the MLG leg and operates with it
The hinged door is connected to the MLG leg through an adjustable rod
When the main gear operates, the rod operates to move the hinged door
A lock collar can be installed on each door actuator when the aircraft is on the ground to prevent closure

Normal Braking Manual Mode

In manual mode, with the braking pedals operating, the braking inputs are sent to the Braking and Steering Control Unit (BSCU)
The BSCU energizes the normal selector valve to connect the green hydraulic power to the system

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Description

Explore the intricate design and operation of the aircraft landing gear system, focusing on the Main Landing Gear (MLG) and Nose Landing Gear (NLG) components. This quiz covers the hydraulic operations, assemblies, and door mechanisms essential for landing gear functionality. Test your knowledge on the engineering principles behind these crucial aircraft systems.