Podcast
Questions and Answers
What are the primary functions of the main landing gear?
What are the primary functions of the main landing gear?
The nose landing gear is typically equipped with a steering mechanism.
The nose landing gear is typically equipped with a steering mechanism.
True (A)
What advantage does the tricycle configuration offer over the tail wheel configuration in terms of braking?
What advantage does the tricycle configuration offer over the tail wheel configuration in terms of braking?
The tricycle configuration allows for more forceful braking without causing the aircraft to nose over.
The ______ configuration is preferred for landing on rough terrain.
The ______ configuration is preferred for landing on rough terrain.
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Match the landing gear arrangement to its corresponding description:
Match the landing gear arrangement to its corresponding description:
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Which of these components provides longitudinal stabilization to the shock strut in a landing gear system?
Which of these components provides longitudinal stabilization to the shock strut in a landing gear system?
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The overcenter link is responsible for preventing the landing gear from collapsing during takeoff and landing.
The overcenter link is responsible for preventing the landing gear from collapsing during takeoff and landing.
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What is the primary function of the aircraft wheels in a landing gear system?
What is the primary function of the aircraft wheels in a landing gear system?
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The ______ is a part of the landing gear assembly that allows the gear to pivot during retraction and extension.
The ______ is a part of the landing gear assembly that allows the gear to pivot during retraction and extension.
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Match the following landing gear subcomponents with their primary functions:
Match the following landing gear subcomponents with their primary functions:
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What is the primary function of the compressed air in the shock strut during taxiing?
What is the primary function of the compressed air in the shock strut during taxiing?
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Fixed landing gear contributes to less drag compared to retractable landing gear.
Fixed landing gear contributes to less drag compared to retractable landing gear.
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What are the three positions of the landing gear handle in the flight deck?
What are the three positions of the landing gear handle in the flight deck?
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The landing gear is kept in the 'UP' position by a ______ mechanism.
The landing gear is kept in the 'UP' position by a ______ mechanism.
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Match the landing gear components with their respective functions:
Match the landing gear components with their respective functions:
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What are the two ways landing gear absorbs the impact of landing?
What are the two ways landing gear absorbs the impact of landing?
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Non-shock absorbing landing gear uses only hydraulic fluid to absorb impact.
Non-shock absorbing landing gear uses only hydraulic fluid to absorb impact.
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What is the primary function of the orifice in a shock strut?
What is the primary function of the orifice in a shock strut?
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The ______ cylinder is fixed to the aircraft and does not move during landing.
The ______ cylinder is fixed to the aircraft and does not move during landing.
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Match the following components of a shock strut with their descriptions:
Match the following components of a shock strut with their descriptions:
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Study Notes
Aircraft Systems: Hydraulic and Pneumatic Power Systems
- The course, ME3531, covers aircraft hydraulic and pneumatic power systems.
- The scope includes landing gear systems, configurations, operating principles, components (struts, torque links, etc.), shock absorption, steering, extension/retraction systems, and safety devices/warning systems.
- The main landing gear is the primary support, absorbing large downward forces during landing and taxiing. Brakes are often included on the main wheels for slowing or stopping the aircraft. The number of gears and wheels depends on the aircraft's design weight and load.
- The nose landing gear also supports weight and load. It's typically equipped with a steering mechanism for ground maneuvering.
- There are three main configurations of aircraft landing gear: tail or conventional, tandem, and tricycle.
- Tricycle configuration is preferred to conventional gear due to advantages in braking, visibility, and preventing ground looping.
- Components of the main and nose landing gear include aircraft wheels (lightweight, strong, aluminum alloy), aircraft tires (supporting weight, absorbing shock, providing runway grip), and trunnions (part of the landing gear assembly attached to the airframe, facilitating pivot during retraction/extension). Other components include struts, drag links, side struts, shimmy dampers, axles, and tires.
- A drag link or drag strut provides longitudinal support to the shock strut, while a side strut or side brace link stabilizes the landing gear laterally.
- The overcenter link prevents gear collapse during ground operation and locks in the down position (also referred to as "downlock").
- A lock mechanism ("downlock") secures the landing gear in the down position, while an "uplock" mechanism holds it in the up position.
- Landing gear systems use shock absorbing and non-shock absorbing components. Shock absorbing systems use fluid to convert impact energy into heat or dissipate it as alternating energy throughout the aircraft. Non-shock absorbing systems, such as spring steel or composite struts, flex to dissipate the impact in controlled ways.
- Shock struts use a combination of nitrogen gas and hydraulic fluid to absorb and dissipate shock forces. The upper cylinder is fixed while the lower cylinder (piston) moves.
- The hydraulic landing gear steering system redirects hydraulic fluid via valves and lines in steering cylinders to control the nose wheel, and is controlled from the pilot's flight deck.
- Shimmy dampers are used to reduce shimmy vibrations that may occur in nose landing gear. The vibration damping is caused by a hydraulic flow restriction in a piston-type damper.
- Emergency extension systems allow the landing gear to lower if the primary power system fails and allows the gear to free-fall to the extended position.
- Safety switches (squat switches), are connected into circuits that prevent the retraction of landing gears while the aircraft is on the ground.
- Ground locks and components are used on most aircraft to provide structural support preventing gear collapse and ensure structural safety and support in ground operation.
- Gear indicators use micro-switches to show the position of the landing gear. The position is shown via green and red lights on the cockpit panel.
- Warning horns sound when the landing gear isn't down and locked. This is to ensure that the aircraft is not landing with the gear retracted. Red lights may also flash.
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Description
This quiz covers the hydraulic and pneumatic power systems used in aircraft, focusing on landing gear systems and their various configurations. Topics include operating principles, components, and safety measures associated with hydraulic and pneumatic systems. Perfect for students of the ME3531 course looking to test their knowledge.
