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  2. Undercarriage arrangements - Wikipedia

    en.wikipedia.org/wiki/Undercarriage_arrangements

    Nose section Center section Example 717, 727, 737: 6 wheels [1x2]+[2x2] A Boeing 737 from Southwest Airlines: 747: 18 wheels [1x2]+[4x4] A Boeing 747-400's main landing gear. Note the toes-up bias angle of the bogies on the wing gear, to ensure correct stowage upon retraction: 707, 720, 757, 767, 787: 10 wheels [1x2]+[2x4] A Boeing 757-200 from ...

  3. Boeing 747 - Wikipedia

    en.wikipedia.org/wiki/Boeing_747

    The proposed models would have combined the 747's fuselage with a new wing spanning 251 feet (77 m) derived from the 777. Other changes included adding more powerful engines and increasing the number of tires from two to four on the nose landing gear and from 16 to 20 on the main landing gear. [242]

  4. Landing gear - Wikipedia

    en.wikipedia.org/wiki/Landing_gear

    The landing gear represents 2.5 to 5% of the maximum takeoff weight (MTOW) and 1.5 to 1.75% of the aircraft cost, but 20% of the airframe direct maintenance cost. A suitably-designed wheel can support 30 t (66,000 lb), tolerate a ground speed of 300 km/h and roll a distance of 500,000 km (310,000 mi) ; it has a 20,000 hours time between overhaul and a 60,000 hours or 20 year life time.

  5. Boeing 747 hull losses - Wikipedia

    en.wikipedia.org/wiki/Boeing_747_hull_losses

    On August 4, 1983, Pan Am Flight 73, a 747-100, struck a VASI light installation and its concrete base landing at Karachi International Airport, causing the nose gear to collapse backwards and to the left, resulting in total destruction of the VASI light installation and damage to the forward cargo hold, floor of the first class section, and ...

  6. Krueger flap - Wikipedia

    en.wikipedia.org/wiki/Krueger_flap

    Krueger flaps deployed from the leading edge of a Boeing 747 (top left and right in photo). Krueger flaps, or Krüger flaps, are lift enhancement devices that may be fitted to the leading edge of an aircraft wing. Unlike slats or droop flaps, the main wing upper surface and its leading edge is not changed. Instead, a portion of the lower wing ...

  7. Conventional landing gear - Wikipedia

    en.wikipedia.org/wiki/Conventional_landing_gear

    A nose-over accident with Polikarpov I-15 bis A replica World War 1 F.E.2 fighter. This aircraft uses a tailskid. The small wheel at the front is a safety device intended to prevent nose-over accidents. The conventional landing gear arrangement has disadvantages compared to nosewheel aircraft. [2]

  8. Delta plane lands with nose gear up at Charlotte airport - AOL

    www.aol.com/delta-plane-lands-nose-gear...

    A Delta Air Lines flight landed with its “nose landing gear up” at Charlotte Douglas International Airport in North Carolina on Wednesday morning, the FAA says.

  9. Tricycle landing gear - Wikipedia

    en.wikipedia.org/wiki/Tricycle_landing_gear

    Tricycle gear aircraft are much less liable to 'nose over' as can happen if a taildragger hits a bump or has the brakes heavily applied. In a nose-over, the aircraft's tail rises and the propeller strikes the ground, causing damage. The tricycle layout reduces the possibility of a ground loop, because the main gear lies behind the center of mass.