Podcast
Questions and Answers
What is the primary purpose of aircraft tyres?
What is the primary purpose of aircraft tyres?
- To cool the aircraft's engines
- To absorb shocks and roughness of landings and take-offs (correct)
- To provide electrical power to the aircraft's systems
- To generate lift during take-off
What should be checked on a new component before it is fitted to an aircraft?
What should be checked on a new component before it is fitted to an aircraft?
- The physical condition of the component
- Only the serviceable label
- The serviceable label and the maintenance publication (correct)
- The weight of the component
Why should fluid be discarded after being bled or drained from the system?
Why should fluid be discarded after being bled or drained from the system?
- To reduce aircraft weight
- Because it may still be usable
- Because it is contaminated and unusable (correct)
- To prevent environmental pollution
What precaution should be taken when handling fluids?
What precaution should be taken when handling fluids?
Why is it essential to release air pressure slowly?
Why is it essential to release air pressure slowly?
What should be inspected before installing a new component?
What should be inspected before installing a new component?
What should be isolated prior to plug removal and installation?
What should be isolated prior to plug removal and installation?
What are the two major assemblies that make up a wheel assembly?
What are the two major assemblies that make up a wheel assembly?
What is the primary purpose of multiple disc brakes in large aircraft?
What is the primary purpose of multiple disc brakes in large aircraft?
How do the operating cylinders move in a multiple disc brake system?
How do the operating cylinders move in a multiple disc brake system?
What is the purpose of the stators in a multiple disc brake system?
What is the purpose of the stators in a multiple disc brake system?
What is the main difference between multiple disc brakes and segmented rotor disc brakes?
What is the main difference between multiple disc brakes and segmented rotor disc brakes?
What happens when the brakes are applied in a multiple disc brake system?
What happens when the brakes are applied in a multiple disc brake system?
What is the primary advantage of using hydraulic pressure in multiple disc brake systems?
What is the primary advantage of using hydraulic pressure in multiple disc brake systems?
What is the purpose of the thrust plate in a multiple disc brake system?
What is the purpose of the thrust plate in a multiple disc brake system?
What is the primary characteristic of segmented rotor disc brakes?
What is the primary characteristic of segmented rotor disc brakes?
What is the primary function of the drag link or drag strut?
What is the primary function of the drag link or drag strut?
Why must the side link or side brace strut be hinged?
Why must the side link or side brace strut be hinged?
What is the function of the over-centre link or down lock?
What is the function of the over-centre link or down lock?
What is the purpose of the uplock?
What is the purpose of the uplock?
What is the main function of the shock strut?
What is the main function of the shock strut?
Where is the top of the shock strut attached?
Where is the top of the shock strut attached?
What is free to move in or out of the shock strut?
What is free to move in or out of the shock strut?
What type of loads do side links bear during certain operations?
What type of loads do side links bear during certain operations?
What happens when the emergency brake switch is selected to the 'off' position?
What happens when the emergency brake switch is selected to the 'off' position?
What is the primary function of the spool valve in the priority change over valve?
What is the primary function of the spool valve in the priority change over valve?
What is the purpose of the park brake valve?
What is the purpose of the park brake valve?
What should be considered before setting the park brake?
What should be considered before setting the park brake?
What is the result of setting the park brake when the main brakes are hot?
What is the result of setting the park brake when the main brakes are hot?
What is the sequence of operations to apply the park brake?
What is the sequence of operations to apply the park brake?
What is the purpose of depressing the brake pedals when releasing the park brake?
What is the purpose of depressing the brake pedals when releasing the park brake?
What happens when the park brake valve is unseated?
What happens when the park brake valve is unseated?
What is the primary function of the compensating port in a brake master cylinder?
What is the primary function of the compensating port in a brake master cylinder?
What is the purpose of the spool valve in a boosted brake master cylinder?
What is the purpose of the spool valve in a boosted brake master cylinder?
What happens to the brakes when the pedal is released in a boosted brake master cylinder?
What happens to the brakes when the pedal is released in a boosted brake master cylinder?
What is the purpose of the toggle mechanism in a boosted brake master cylinder?
What is the purpose of the toggle mechanism in a boosted brake master cylinder?
Why is a boosted brake master cylinder used in an aircraft?
Why is a boosted brake master cylinder used in an aircraft?
What happens when the pilot pushes the pedal in a boosted brake master cylinder?
What happens when the pilot pushes the pedal in a boosted brake master cylinder?
What is the purpose of the master cylinder in a brake system?
What is the purpose of the master cylinder in a brake system?
What is the benefit of using a boosted brake master cylinder over an independent master cylinder?
What is the benefit of using a boosted brake master cylinder over an independent master cylinder?
Study Notes
Landing Gear Components
- Drag link (also known as drag strut) stabilizes the landing gear assembly longitudinally and must be hinged to enable gear retraction.
- Side link (or side brace strut) stabilizes the landing gear assembly laterally and bears side loads during skidding, crosswind landings, and take-offs.
- Over-centre link (or down lock) applies pressure to the centre pivot joint in a drag or side brace link to prevent gear collapse during ground operation.
- Uplocks positively lock the landing gear in the retracted (up) position, removing the need for constant hydraulic or electrical actuator input.
Shock Strut
- The shock strut is the main vertical member of the landing gear assembly and contains the shock absorbing mechanism.
- The top of the strut can be attached to, or be an integral part of, the trunnions.
Safety Precautions
- New components should be examined and cross-checked with the appropriate maintenance publication to ensure correct fitting.
- New components should be inspected for cleanliness before installation, and components containing fluid should be primed before installation and bled after installation.
- Fluid bled or drained from the system should be discarded, and care should be taken to prevent spillage, which may have detrimental effects on paint, rubber, cable insulation, etc.
- Air pressure should be released slowly, particularly in confined spaces.
Wheel Assemblies
- Wheel assemblies consist of two major assemblies: tyre and hub.
- Aircraft tyres provide a cushion of air to absorb shocks and roughness during landings and take-offs, support the aircraft's weight, and provide traction for braking and stopping.
Braking Systems
- Multiple disc brakes are heavy-duty brakes designed to provide increased friction surfaces for braking purposes in large aircraft.
- Segmented rotor disc brakes are heavy-duty brakes adapted for use with high-pressure hydraulic systems.
- Boosted brake master cylinders utilize hydraulic system pressure to assist the pilot in applying braking force when needed.
- GenFly brake system emergency operation allows for continued braking in the event of No 1 system failure.
Park Brakes
- The park brake is a sub-assembly of the normal hydraulic brake system, located in the cockpit.
- Applying the park brake depends on the type of system used, and brake assembly temperature should be considered before setting the park brake.
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