Not sure exaclty what you are asking. There are many minor systems that relate to the Landing Gear and the wheels and brakes. The aircraft is divided into different categories referred to as ATA categories. ATA 29 is Hydraulic Controls and ATA 28 is Fuel Controls. Landing Gear is covered by ATA 32. Then this category is sub-divided based upon the manufacturer's organization. ATA 32-10 is the Main Gears ATA 32-20 is the Nose Gears ATA 32-30 is gear retraction and extension ATA 32-40 is wheel and brakes and anti-skid ATA 32-50 is steering ATA 32-60 is Proximity Indicatio System Each of these sub-categories that relate to the braking, and steering and retraction are considered sub-systems of the landing gear.
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Attached to a gear are many tires. The tires are used the land the aeroplane. That is why it is called landing gear.
Uhh...keeping airplanes from lying on the ground when they're not flying?
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Vlo = Maximum landing gear operating speed (do not exceed this speed while the landing gear is operaing) Vle = Maximum landing gear extended speed (do not exceed this speed while the landing gear is extended) When the landing gear is fully retracted or fully extended it is locked into position and is more resistant to damage from high airspeeds. When the landing gear is in the process of extending or retracting (operating) there is no locking mechanism, and the only thing resisting the airflow is the extension/retraction mechanisms. Additionally, on some aircraft, the landing gear may swing or swivel in odd directions in order to tuck into their recesses, this can cause odd aerodynamic behavoir in the rest of the aircraft if done at high speeds. Once the landing gear is extended, it is rare that a pilot would then exceed Vlo. Most of the time the landing gear is lowered shortly before landing and the pilot is doing everything he can to slow the aircraft further. However in the event that an aircraft had to be flown a long distance with the landing gear extended (such as a ferry flight to a repair facility) the pilot would go ahead & fly Vle.