This was a result of the hijacker known as D. B. Cooper, who parachuted from Northwest Airlines flight 305 over the mountains between Portland, Oregon and Seattle, Washington on 24 November 1971.
Speed was increased by 50 mph (80 km/h) by replacing the two side engines with the JT8D-217 or the JT8D-219, which are also found on many MD-80s, along with the addition of hush kits to the center engine. However, with the aid of rollers in the floor and modularised passenger cabins, the QC could be converted from passenger carrier to a freighter in 30 minutes. The 727's JT8D jet engines use older low-bypass turbofan technology, whereas Stage 3 aircraft use the more efficient and quieter high-bypass turbofan design. * In the 1970s, Boeing considered development of a further elongated "727-300" variant, stretched by about 9 meters (20 feet) compared to the 727-200 and offering 35 more seats. Eventually, the three airlines agreed on a trijet design for the new aircraft. Besides the airliner accommodation, a freighter and a Quick Change convertible version were offered. Newer high bypass engines outperformed the JT8D. The 727 was used for many domestic flights and on some international flights within its range. As of mid-2013, there were still 188 727s in service with airlines, government agencies and freight companies. To enable passenger access at small fields, Boeing built a stairway into a door that dropped down from the bottom of the fuselage under the tail. There have been 118 fatal incidents involving the Boeing 727. The 727 also proved popular with cargo and charter airlines. Boeing had not offered the JT8D, as it was about 1,000 lb (450 kg) heavier than the RB163, though slightly more powerful; the RB163 was also further along in development than the JT8D.
It was a turbulent time before the current stringent security measures came into being. One 727-100 was retained by Boeing, bringing total production to 572.. And the tradition continues ... in June of 2017 Boeing announced at the Paris Air Show its newest airliner, the NMA, probably to be called the 797. The first 727-100 (N7001U) flew on February 9, 1963. Because the engines are mounted on the rear of the fuselage, this leaves the wings clear of any obstruction caused by engine pylons.
This allowed airlines to carry passengers from cities with large populations, but smaller airports to worldwide tourist destinations.
Note that the 777-200 has four cabin doors while the 777-300 has five cabin doors. As well as short field capabilities, the 727 was able to operate into and out of gravel runways as well.
Boeing 767-200, 767-300, and 767-400 wide-body, twin-jet.
As of July 2013[update], a total of 109 Boeing 727s (5× 727-100s and 104× -200s) were in commercial service with 34 airlines; three years later, the total had fallen to 64 airframes (4× 727-100s and 60× -200s) with 26 airlines. This was the last production variant of the 727 to be developed by Boeing; the last 727 aircraft completed by Boeing was a 727-200F Advanced. See more Boeing 727 photographs and spotting tips. The Boeing 727 is a tri-jet with an engine each side of the fuselage just adjacent to the leading edge of the tail fin.
They determined that the JT8D-200 engine could be used on the two side-mounted pylons.
The Advanced featured improvements in lifting capacity through airframe strengthening, more powerful engines as well as an option for a longer range version with additional fuel carrying capacity. Note also the classic Boeing "V-shaped" windshield windows. At that time Boeing intended to use three Allison AR963 turbofan engines, license-built versions of the Rolls-Royce RB163 Spey used by the Trident. Inside this highly popular City Jet. , As of May 2020[update], there were 13 Boeing 727s (1× 727-100s and 12× -200s) were in commercial service with 6 airlines, plus one in government and private use. This meant the 727 did not have to leave one of its engines running whilst on the ground to provide power.
The 133 ft (40.5 m) long 727-100 typically carries 106 passengers in two classes over 2,250 nmi (4,170 km), or 129 in a single class. These incidents caused the loss of 4,209 lives of which 345 were caused by 178 hijackings. Northwest Airlines retired its last 727 from charter service in June 2003. Also, the 777 is the only airliner currently in operation that has two, 6-wheel main landing gear configurations. QF stands for Quiet Freighter. Convertible passenger cargo version, additional freight door and strengthened floor and floor beams, three alternative fits: QC stands for Quick Change. In addition, the 3 man flight crew meant the cockpit was far larger than newer aircraft only requiring a 2 man crew. A quadjet, the 707 has a swept wing with podded engines.  The Gettys bought N311AG from Revlon in 1986, and Gordon Getty acquired the aircraft in 2001. The 727-100 had carried about three million passengers during its years of service. Boeing subsequently modified the design with the Cooper vane so that the airstair could not be lowered in flight. These features can be seen in the Boeing 727-200 of Delta Air Lines shown below.
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