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The Boeing 747-400 is a large, long-range wide-body airliner produced by Boeing Commercial Airplanes, an advanced variant of the initial Boeing 747.The "Advanced Series 300" was announced at the September 1984 Farnborough Airshow, targeting a 10% cost reduction with more efficient engines and 1,000 nautical miles [nmi] (1,900 km; 1,200 mi) of additional range.
Nose section Center section Example 717, 727, 737: 6 wheels [1x2]+[2x2] A Boeing 737 from Southwest Airlines: 747: 18 wheels [1x2]+[4x4] A Boeing 747-400's main landing gear. Note the toes-up bias angle of the bogies on the wing gear, to ensure correct stowage upon retraction: 707, 720, 757, 767, 787: 10 wheels [1x2]+[2x4]
A total of 694 of the 747-400 series aircraft were delivered. [135] At various times, the largest 747-400 operator has included Singapore Airlines, [193] Japan Airlines, [193] and British Airways. [194] [195] As of July 2019, 331 Boeing 747-400s were in service; [168] there were only 10 Boeing 747-400s in passenger service as of September 2021.
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.
On June 28, 1998, United Airlines Flight 863, a Boeing 747-400 flying United's regularly scheduled transpacific service from San Francisco International Airport to Sydney Airport was forced to shut down one of its right-wing engines and nearly collided with San Bruno Mountain while recovering from the engine failure.
One Boeing 747-400 originally destined to fly for Northwest Airlines was sold to United Airlines which was in service until United retired its 747 fleet in 2017. Northwest was looking for manufacturers to discuss the replacement of their 100, 110 and 125 seat McDonnell Douglas DC-9 aircraft, with an average age of 35 years. [2] [3]
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The aircraft noise from the 747-8 has earned it a Quota Count of 2 for takeoff and 1 for landing at London's three major airports, a significant improvement over the 747-400. [ 67 ] In February 2015, the Boeing 747-8 Intercontinental was given 330-minute ETOPS approval, the first time that ETOPS-330 approval was given to a four-engined aircraft.
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