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2. Lockheed Martin F-35 Lightning II - Wikipedia

   en.wikipedia.org/wiki/Lockheed_Martin_F-35...

   2006–present. Number built. 1,000+ [4] Developed from. Lockheed Martin X-35. The Lockheed Martin F-35 Lightning II is an American family of single-seat, single-engine, stealth multirole combat aircraft designed for air superiority and strike missions; it also has electronic warfare and intelligence, surveillance, and reconnaissance capabilities.

3. Escalator - Wikipedia

   en.wikipedia.org/wiki/Escalator

   Escalator. For the album by Sam Gopal, see Escalator (album). An escalator is a moving staircase which carries people between floors of a building or structure. It consists of a motor -driven chain of individually linked steps on a track which cycle on a pair of tracks which keep the step tread horizontal.

4. Northrop P-61 Black Widow - Wikipedia

   en.wikipedia.org/wiki/Northrop_P-61_Black_Widow

   Development This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources in this section. Unsourced material may be challenged and removed. (August 2020) (Learn how and when to remove this message) Origins The P-61 radar operator occupied a separate compartment in the rear of the fuselage accessed from a hatch below. In ...

5. 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.

6. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   The fifth-wheel coupling provides the link between a semi-trailer and the towing truck, tractor unit, leading trailer or dolly. The coupling consists of a kingpin, a 2-or- -inch-diameter (50.8 or 88.9 mm) vertical steel pin protruding from the bottom of the front of the semi-trailer, and a horseshoe-shaped coupling device called a fifth wheel ...

7. STS-61 - Wikipedia

   en.wikipedia.org/wiki/STS-61

   STS-61 was NASA 's first Hubble Space Telescope servicing mission, and the fifth flight of the Space Shuttle Endeavour. The mission launched on December 2, 1993, from Kennedy Space Center (KSC) in Florida. The mission restored the spaceborne observatory's vision (marred by spherical aberration in its mirror) with the installation of a new main ...