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2. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   What makes the fifth wheel so important is the ability it gave fleet owners to attach large trailers to tractors easily and safely and the freedom it gave them to switch out trailers. Without a fifth wheel, the modern distribution system would look quite different as drop-and-hook would not be easy.

3. Undercarriage arrangements - Wikipedia

   en.wikipedia.org/wiki/Undercarriage_arrangements

   Airbus A380 nose landing gear (consisting of a single 2-wheel bogie) 4 wheels, 2 axles: An Airbus A330's main landing gear (consisting of two 4-wheel bogies) 6 wheels, 3 axles: A Boeing 777's main landing gear (consisting of two 6-wheel bogies) 14 wheels, 7 axles: The Antonov An-225's main landing gear (consisting of two 14-wheel bogies)

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. Spoiler (aeronautics) - Wikipedia

   en.wikipedia.org/wiki/Spoiler_(aeronautics)

   The Lockheed Tristar was fitted with a system called Direct Lift Control that used the spoilers on landing approach to control descent. Airbus aircraft with fly-by-wire control utilise wide-span spoilers for descent control, spoilerons, gust alleviation, and lift dumpers. Especially on landing approach, the full width of spoilers can be seen ...

6. Landing gear extender - Wikipedia

   en.wikipedia.org/wiki/Landing_gear_extender

   They move the wheels forward of the landing gear leg by 2-3 inches (5–8 cm). [ 1 ] The installation of landing gear extenders is almost always the result of operational experience with an aircraft design that shows a problem with the landing gear – when the brakes are applied heavily the aircraft has a tendency to go up on its nose and ...

7. Tow hitch - Wikipedia

   en.wikipedia.org/wiki/Tow_hitch

   A tow hitch (or tow bar or trailer hitch in North America [1]) is a device attached to the chassis of a vehicle for towing, or a towbar to an aircraft nose gear. It can take the form of a tow ball to allow swiveling and articulation of a trailer , or a tow pin, or a tow hook with a trailer loop, often used for large or agricultural vehicles ...