Aircraft Landing Gear Hydraulic System Quiz
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Questions and Answers

What is the purpose of the restrictors in the orifice check valves?

  • To prevent the flow of hydraulic fluid
  • To slow down the extension of the gear (correct)
  • To activate the free-fall valve
  • To speed up the extension of the gear
  • In aircraft with a non-mechanical back-up for gear unlatching, what power source is commonly used?

  • Electrical power
  • Mechanical power
  • Pneumatic power (correct)
  • Hydraulic power
  • What type of valve is used in small aircraft for emergency gear extension?

  • Free-fall valve (correct)
  • Pressure relief valve
  • Check valve
  • Solenoid valve
  • Why does air movement past the gear help in its extension during emergency gear deployment?

    <p>To aid in pushing the gear into position</p> Signup and view all the answers

    Why are large and high-performance aircraft equipped with redundant hydraulic systems?

    <p>To provide backup hydraulic power</p> Signup and view all the answers

    What is used to release the uplocks and allow the gear to free fall if hydraulic power fails to extend the gear?

    <p>Unlatching device</p> Signup and view all the answers

    What is adjusted to provide the correct amount of over-center travel of the side brace links?

    <p>Lock link end fitting</p> Signup and view all the answers

    In what position should the landing gear be when adjusting the lock link end fitting?

    <p>Down position</p> Signup and view all the answers

    What must the gear do when held inboard six inches from the down and locked position and then released?

    <p>Free fall into the locked down position</p> Signup and view all the answers

    How is the down lock spring tension checked?

    <p>With a spring scale</p> Signup and view all the answers

    What should be done to ensure proper adjustments for each aircraft?

    <p>Check manufacturer’s maintenance data</p> Signup and view all the answers

    What is crucial to prevent collapse of the gear?

    <p>Adjusting the over-center position of side brace locking link</p> Signup and view all the answers

    What happens when the gear cylinders are fully retracted?

    <p>They mechanically contact the sequence valve plungers</p> Signup and view all the answers

    What role do sequence valves A and B play during retraction?

    <p>Act as check valves</p> Signup and view all the answers

    How is the nose gear unlocked for lowering?

    <p>Pressurized hydraulic fluid flows from the hydraulic manifold to the nose gear uplock</p> Signup and view all the answers

    What prevents fluid from reaching the down side of the main gear actuators when the doors are opening?

    <p>Sequence valves A and B</p> Signup and view all the answers

    What happens when the main gear uplocks receive fluid pressure?

    <p>They unlock</p> Signup and view all the answers

    Which components engage the plungers of sequence valves A and B to open them when the doors are fully open?

    <p>Door actuators</p> Signup and view all the answers

    How can the roller be adjusted if it is not within tolerance?

    <p>By loosening the mounting bolts and raising or lowering the latch roller support</p> Signup and view all the answers

    What is typically done at the hinge to adjust landing gear door clearances?

    <p>Adjusting door hinges</p> Signup and view all the answers

    How is a main landing gear door latch mechanism adjusted on some installations?

    <p>By placing a serrated hinge with an elongated mounting hole in the proper position</p> Signup and view all the answers

    What allows linear adjustments in certain installations for door hinges?

    <p>Using serrated washers</p> Signup and view all the answers

    What does packing grease into a clean, dry bearing involve?

    <p>Pressing the bearing into the grease on the palm of the hand until it passes through rollers</p> Signup and view all the answers

    What is used to hold the position of a serrated hinge during adjustment?

    <p>Serrated washers and torqued mounting bolts</p> Signup and view all the answers

    How does the pilot extend and retract the landing gear in the simplest system?

    <p>By operating a lever mechanically linked to the gear</p> Signup and view all the answers

    What is common in decreasing the required force for landing gear operation?

    <p>Use of roller chain, sprockets, and a hand crank</p> Signup and view all the answers

    What type of landing gear system is typically found on light aircraft?

    <p>All-electric system</p> Signup and view all the answers

    What is characteristic of an all-electric system in moving the landing gear?

    <p>Uses an electric motor and gear reduction</p> Signup and view all the answers

    Which component is common in electric/hydraulic landing gear systems like those found in Cessna and Piper aircraft?

    <p>Reversible electric motor-driven hydraulic pump</p> Signup and view all the answers

    What is a key feature of power packs used in electric/hydraulic gear retraction systems?

    <p>Contain a reversible electric motor-driven hydraulic pump</p> Signup and view all the answers

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