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Airbus jet airliners taxiing at Chengdu Shuangliu International Airport A privately owned Sea Vixen taxis back from an air show flight, with wings folding as it moves.. Taxiing (rarely spelled taxying) [1] is the movement of an aircraft on the ground, under its own power, in contrast to towing or pushback where the aircraft is moved by a tug.
EGTS is an electric taxiing system enabling an aircraft to taxi independently of its main engines or tug. [2]Each of the two main landing gear inboard wheels is driven by an electric motor powered by the auxiliary power unit (APU) generator, allowing the aircraft to push back from the gate without an airport tug and to taxi without the use of the main engines.
The term elephant walk dates to World War II when large fleets of allied bombers would conduct attacks in missions containing 1,000 aircraft. Those who observed the taxiing of these large numbers of aircraft to take off in single file in nose-to-tail formations said that they looked like elephants walking to the next watering hole.
Most airports do not have a specific speed limit for taxiing (though some do). There is a general rule on safe speed based on obstacles. Operators and aircraft manufacturers might have limits. Typical taxi speeds are 20–30 knots (37–56 km/h; 23–35 mph). [1] [2]
It is a higher-risk procedure, as pilots may not see, or hear the radio transmissions from, aircraft taxiing on the runway. [3] At controlled airports, take-off or landing clearances do not authorize the pilot to reverse course and backtrack along the runway, unless specified by air traffic control.
Conventional airplanes accelerate along the ground until reaching a speed that is sufficient for the airplane to takeoff and climb at a safe speed. Some airplanes can take off at low speed, this being a short takeoff. Some aircraft such as helicopters and Harrier jump jets can take off and land vertically. Rockets also usually take off ...
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The TaxiBot eliminates the use of airplane engines during taxi-in and until immediately prior to take-off during taxi-out potentially saving airlines billions of dollars in fuel that is used. The TaxiBot is controlled by the pilot from the cockpit using the regular pilot controls. [6] British Airways has been using a similar sort of tug too. [7]