There are several different types of landing gears, but why do some of them tilt up during landing?
Well, think of the human foot. When you walk, your heel touches down first before your full body weight presses downward. In aviation it's the same concept. With larger, heavier jets, more surface and tires are needed to evenly distribute the weight of the aircraft. Larger airplanes, such as the Airbus A330, Boeing 757, 777, have two tires at the nose gear and at least 4 on each side under the center of the plane's fuselage. The actuator forces the 2 back tires down, making the two forward ones move up. This way the rear tires touch the ground first, which is important, otherwise the front tires would slam into the ground and the plane bounces up and down. Once the aircraft's weight presses the tires onto the ground, a pressure relief valve opens up and the actuator collapses, letting both tire axles touch down. This happens in the split of a second, but once the actuator is fully compressed (weight on wheels), it triggers the Air/Ground Sensing Unit from the air (from flight to ground), even before the nose wheel has touched down. ✈
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