Aircraft Landing Gear Systems
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Questions and Answers

What is the primary advantage of a conventional landing gear configuration?

  • Easy to control during takeoff and landing
  • Level cabin area for passengers
  • Reduced drag in the air (correct)
  • Increased stability on the ground

    • What is a characteristic of an aircraft with a tricycle landing gear?

  • The aircraft has a tail wheel
  • The aircraft has only two main wheel assemblies
  • The aircraft fuselage is tilted during takeoff and landing
  • The aircraft fuselage is in a level attitude on the ground (correct)

    • What is a disadvantage of a conventional landing gear configuration?

  • Increased stability on the ground
  • Easy to control during takeoff and landing
  • Less stable on the ground (correct)
  • Reduced drag in the air

    • What is an advantage of a tricycle landing gear configuration?

    <p>Stable on the ground</p> Signup and view all the answers

    What is a characteristic of an aircraft with a conventional landing gear?

    <p>The aircraft has a tail wheel</p> Signup and view all the answers

    What is the primary purpose of a landing gear system?

    <p>To support the aircraft during takeoff and landing</p> Signup and view all the answers

    What is the primary function of the compressed air in the chamber of an air-oleo shock-absorbing landing gear?

    <p>To act as a shock absorber during taxiing</p> Signup and view all the answers

    What is the main advantage of retractable landing gear?

    <p>Elimination of drag caused by exposure to airflow</p> Signup and view all the answers

    What is the purpose of fairing on fixed gear?

    <p>To reduce drag</p> Signup and view all the answers

    What is the primary importance of retractable landing gear?

    <p>Safe operation of the aircraft</p> Signup and view all the answers

    What is the purpose of panels attached to the retractable landing gear of a Boeing 737?

    <p>To provide smooth airflow over the struts</p> Signup and view all the answers

    What is the purpose of wheel pants on fixed gear?

    <p>To reduce drag</p> Signup and view all the answers

    What type of power is used to operate retractable landing gear?

    <p>Hydraulic or electric power</p> Signup and view all the answers

    What is the purpose of the torque links in a retractable landing gear system?

    <p>To transmit torque loads</p> Signup and view all the answers

    What is the primary function of the drag link?

    <p>To stabilize the landing gear assembly longitudinally</p> Signup and view all the answers

    Which component is often referred to as a scissors assembly?

    <p>Torque Links</p> Signup and view all the answers

    What is the purpose of the side brace link?

    <p>To stabilize the landing gear assembly laterally</p> Signup and view all the answers

    What is the name of the component that contains the shock-absorbing mechanism?

    <p>Struts</p> Signup and view all the answers

    What is the purpose of the overcenter link?

    <p>To apply pressure to the center pivot joint</p> Signup and view all the answers

    What is the name of the component that is attached to the airframe?

    <p>Trunnion</p> Signup and view all the answers

    What is the name of the component that can tilt fore and aft?

    <p>Truck</p> Signup and view all the answers

    What is the name of the component that holds wheels and axle in a correctly aligned position?

    <p>Torque Links</p> Signup and view all the answers

    What is unique about Type I tires?

    <p>Their design is no longer active.</p> Signup and view all the answers

    What is a characteristic of Type III tires?

    <p>They are typically used on light aircraft with landing speeds.</p> Signup and view all the answers

    What is common among Types I, III, VII, and VIII tires?

    <p>They are all still in production.</p> Signup and view all the answers

    What is unique about Type VII tires?

    <p>They have an extra high pressure rating, low speed.</p> Signup and view all the answers

    What is a feature of Type VIII tires?

    <p>They have all of the above features.</p> Signup and view all the answers

    How are Type I tires designated?

    <p>By their nominal overall diameter in inches.</p> Signup and view all the answers

    What is the primary function of main landing gear?

    <p>To provide the main support of the airplane on land or water</p> Signup and view all the answers

    What type of landing gear is typically used in helicopters and sailplanes?

    <p>Nonabsorbing landing gear</p> Signup and view all the answers

    What is the purpose of the shock cord in shock-cord landing gear?

    <p>To absorb the shock of landing</p> Signup and view all the answers

    What is the function of the oleo strut in spring-oleo struts?

    <p>To absorb the shock of landing</p> Signup and view all the answers

    What is the purpose of the spring in spring-type gear?

    <p>To absorb the shock of landing</p> Signup and view all the answers

    What is the main difference between main landing gear and auxiliary landing gear?

    <p>Main landing gear provides the main support of the airplane, while auxiliary landing gear provides additional support</p> Signup and view all the answers

    What is the purpose of the brakes in main landing gear?

    <p>To slow down the aircraft during landing</p> Signup and view all the answers

    What is the purpose of the cowling and fairing in main landing gear?

    <p>To streamline the airflow around the landing gear</p> Signup and view all the answers

    Study Notes

    Landing Gear Systems

    • Landing gear designs vary from fixed arrangements to complex retractable systems.

    Landing Gear Configurations

    • Aircraft landing gear can be classified as either tricycle or conventional.
    • Conventional geared aircraft:
      • Have two main wheel assemblies and a tail wheel.
      • Are suitable for rough field operations and associated with older aircraft.
      • Advantages:
        • Reduced drag in the air.
        • Reduced landing gear weight.
      • Disadvantages:
        • Less stable on the ground.
        • Require more skill when taxiing, during takeoff and landing.

    Tricycle Landing Gear

    • Have a nose wheel assembly and two main gear assemblies.
    • Allow the aircraft fuselage to be in a level attitude on the ground.
    • Advantages:
      • Cabin area is level, making it easy for passengers to move inside the aircraft.
      • Stable on the ground.
      • Easy to control when taxiing, during takeoff and landing.

    Classification of Landing Gear

    • Main landing gear:
      • Supports the airplane on land or water.
      • Components:
        • Wheels, floats, or skis.
        • Shock absorbing equipment.
        • Brakes.
        • Retracting mechanism.
        • Control and warning devices.
        • Cowling and fairing.
        • Structural members for attachment to the primary structure of the airplane.
    • Auxiliary landing gear:
      • Tail or nose wheel installations.
      • Skids.
      • Outboard pontoons.
      • Cowling and reinforcements.

    Types of Landing Gear

    • Non-absorbing landing gear:
      • Rigid landing gear (used in helicopters and sailplanes).
      • Shock-cord landing gear (uses rubber shock cords).
      • Spring-type gear (uses single, tapered strips or tubes of spring steel or composite material).
    • Shock-absorbing landing gear:
      • Spring-oleo struts (piston and coiled spring).
      • Air-oleo (principle operation is similar to spring-oleo struts).

    Fixed Gear

    • Non-retractable landing gear attached to structural members of the airplane.
    • Often equipped with fairing to reduce drag.
    • Wheel pants are used to cover the wheel and tire to reduce drag.
    • Usually found on small aircraft.

    Retractable Landing Gear

    • Developed to eliminate drag caused by exposure of landing gear to airflow during flight.
    • Retraction is accomplished with hydraulic or electric power.
    • In emergency, backup hydraulic systems, stored air or gas can be directed into actuating cylinders.
    • Much more complex, with primary importance in the safe operation of the aircraft.

    Landing Gear Components

    • Components of landing gear assemblies:
      • Trunnion (attached to the airframe).
      • Struts (vertical member of the landing gear assembly).
      • Torque links (connects strut cylinder to piston and axle).
      • Truck (located on the bottom of the strut piston).
      • Drag link (stabilizes the landing gear assembly longitudinally).
      • Side brace link (stabilizes the landing gear assembly laterally).
      • Overcenter link (applies pressure to the center pivot joint).
      • Swivel gland (used in retractable landing gear).
      • Shimmy dampers (used to reduce shimmy).

    Tires and Wheels

    • Types of tires:
      • Type I (smooth contour, no longer active, used on fixed gear aircraft).
      • Type II (high pressure, not applicable).
      • Type III (low pressure, common general aviation tire).
      • Type IV (extra low pressure, not applicable).
      • Type V (not applicable).
      • Type VI (low profile, not applicable).
      • Type VII (extra high pressure, low speed, and extra high pressure, high speed).
      • Type VIII (extra high pressure, low profile, low speed, and extra high pressure, low profile, high speed).

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    Related Documents

    Aircraft Landing Gear Systems (ESA 272) PDF

    Description

    Explore the different types of landing gear designs and configurations, including fixed and retractable systems, tricycle and conventional gear, and their advantages and disadvantages.

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