The Boeing 747 is a large, long–range wide-body airliner and cargo aircraft manufactured by Boeing Commercial Airplanes in the United States. With a ten-abreast economy seating, it typically accommodates 366 passengers in three travel classes. The 747 is the basis for several government and military variants, like the VC-25 or the E-4 Emergency Airborne Command Post.
About Boeing 747 in brief
The Boeing 747 is a large, long–range wide-body airliner and cargo aircraft manufactured by Boeing Commercial Airplanes in the United States. With a ten-abreast economy seating, it typically accommodates 366 passengers in three travel classes. The 747 is the basis for several government and military variants, like the VC-25 or the E-4 Emergency Airborne Command Post. By June 2020, 1,556 aircraft had been built, with 15 747-8s remaining on order. Airbus competed with later variants with the heaviest versions of the A340 until surpassing the 747 in size with the A380, introduced in 2007. As of 2020, 61 of the jets have been lost in accidents, in which a total of 3,722 people have died. The partial double-deck aircraft was designed with a raised cockpit so it could be converted to a freighter airplane by installing a front cargo door, as it was initially thought that it would eventually be superseded by supersonic transports. It has a pronounced 37. 5° wing sweep, allowing a Mach 0. 85 cruise speed, and its heavy weight is supported by four main landing gear legs with four-wheel bogies each. It was shortened for the longer-range 747SP in 1976, and the 747-300 followed in 1983 with a stretched upper deck for up to 400 seats in three classes. Boeing introduced the -200 in 1971, with more powerful engines for a heavier maximum takeoff weight of 833,000 lb from the initial 735,000 lb, for a longer 6,560 nmi range up from 4,620 nmi.
It was first delivered in October 2011, with new General Electric GEnx engines, and was first delivery in October 2013. The first flight took place on February 9, 1969. It entered service with Pan Am on January 22, 1970; it was the first airplane dubbed a \”Jumbo Jet\”. The 747-400 with improved RB-211 and CF6 versions, along with the PW4000, and a two-crew glass cockpit, was introduced in 1989 and is the most common variant. In March 1964, the U.S. Air Force started a series of study projects on a very large strategic transport aircraft. These studies led to initial requirements for the CX-Heavy Logistics System with a load capacity of 180,000 pounds and a speed of Mach 0. 75, and an unrefueled range of 5,000 nautical miles. The payload bay had to be 17 feet wide by 13. 5 feet high and 100 feet long with access through doors at the front and rear. All of the companies that submitted proposals were given contracts for the airframe along with General Electric and Pratt & Whitney. In May 1964, Boeing, Lockheed, General Dynamics, Marietta; Douglas, Curtiss-Wright, and Pratt and Whitney, and Lockheed and Douglas, were given additional contracts. The CXX-X-LSLS needed to be able to be loaded from the front, where the cockpit usually was.