Aircraft Main Landing Gear System
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Questions and Answers

What is the function of the IRDC?

  • Manages the steering system
  • Manages the anti-skid, brake pressure control, and data acquisition systems (correct)
  • Operates the parking brake
  • Regulates the shuttle valve

    • What happens when the normal braking mode is lost?

  • Parking brake is engaged
  • Ultimate braking is activated
  • Alternate braking is disabled
  • Alternate braking takes over with a yellow indication (correct)

    • What is the purpose of the U-turn mode?

  • Required for braking on wet runways
  • Used for commercial aircraft only
  • Used for steering on the ground
  • Used for military aircraft only (correct)

    • What is the location of the EBCU?

    <p>Avio bay</p> Signup and view all the answers

    What is the function of the CPIOM-G?

    <p>Provides 1000VU of power</p> Signup and view all the answers

    What is the purpose of the steering system's RVDT?

    <p>Provides feedback to the control spool</p> Signup and view all the answers

    When is the automatic reset function initiated?

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

    What happens during the pre-land test?

    <p>Internal test after landing gear lock down</p> Signup and view all the answers

    What is the purpose of the lock valve in maintenance?

    <p>Replaces a wheel or brake</p> Signup and view all the answers

    What is the function of the parking brake light?

    <p>Reads 315</p> Signup and view all the answers

    How many points is the main landing gear attached to the fuselage?

    <p>11 points</p> Signup and view all the answers

    What is the purpose of the SOSV in the nose landing gear?

    <p>To allow hydraulic pressure to the steering manifold when NLG is down</p> Signup and view all the answers

    What is the function of the lock link in the folding dragstay?

    <p>To lock the dragstay in the down position</p> Signup and view all the answers

    What is the purpose of the 3 vent valves in emergency extension?

    <p>To ensure all landing gear actuators are dumped in the return-line</p> Signup and view all the answers

    How many retractation actuator attachment points are there?

    <p>3</p> Signup and view all the answers

    What is the purpose of the down lock MLG?

    <p>To lock the gear down in emergency mode</p> Signup and view all the answers

    What is the function of the nose door by-pass valve?

    <p>To allow both front doors to be opened for maintenance purposes</p> Signup and view all the answers

    How long does it take for sequence retraction?

    <p>12s</p> Signup and view all the answers

    What is the purpose of the anti-skid system?

    <p>To compare wheel speed with aircraft speed</p> Signup and view all the answers

    What is the purpose of the BTMU?

    <p>To monitor brake temperature</p> Signup and view all the answers

    Study Notes

    Main Landing Gear (MLG) and Door

    • Each MLG consists of three legs that are not structurally independent or interchangeable, with different geometries
    • Attached to the fuselage at 11 points, with 3 retraction actuator points
    • Moving components are structurally independent
    • Controlled by the L/G lever, with a red arrow indicating when the L/G is not locked down in approach configuration
    • Location: main fitting at the lower hinge pin, lateral link at the lower hinge pin, and longitudinal link at the top main fitting
    • Forward leg is braced by 2 links: upper and lower links

    Control and Indications

    • Green arrows indicate the L/G is locked down
    • Pedestal has the L/G lever and 3 green arrows
    • Location: main fitting at the lower hinge pin, lateral link at the lower hinge pin, and longitudinal link at the top main fitting

    Nose Landing Gear and Door

    • Fwd doors open mechanically
    • Gear automatically centers upon full extension of the strut
    • Folding dragstay consists of a lower dragstay attached to the main fitting and a panel-type upper dragstay with a removable pintle pin
    • Locked in the down position by a lock link held by 2 tension springs
    • SOSV allows hydraulic pressure to the steering manifold when NLG is down or isolates aircraft hydraulic pressure when NLG is up

    Extension and Retraction

    • Emergency extension:
      • Close cut-off valves to isolate hydraulic supply pressure
      • Open 3 vent valves to dump all landing gear actuators in the return line
    • ECMU electrically operates EBMA
    • Down lock MLG: one per leg, equipped with a hook, trigger, and roller
    • Spring assist to lock gear down in emergency mode

    Wheel and Brakes

    • Main wheel speed: tachometer
    • BTMU: temp sensors connected to IRDC
    • Anti-skid: compares wheel speed with aircraft speed (provided by GADIRS) to release brakes for that pair of wheels
      • Touchdown protection inhibits braking before wheel spin-up
      • Prevents loss of braking efficiency (disabled under 5m/s)
    • Autobrake function:
      • Overrides auto brake system when pedals are used
      • Requires ground spoiler p/b not to be pressed
      • Set on HI/RTO for takeoff

    Braking Modes

    • Normal braking
    • Alternate braking (when normal braking is lost)
    • Park brake
    • Emergency brake operation: pedals mechanically linked
    • Ultimate braking: pedal braking unavailable

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    Description

    This quiz covers the components and features of an aircraft's main landing gear system, including its structure, retractation, and control systems.

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