Boeing 727
The Boeing 727 is an American narrow-body airliner that was developed and produced by Boeing Commercial Airplanes.
After the heavier 707 quad-jet was introduced in 1958, Boeing addressed the demand for shorter flight lengths from smaller airports.
On December 5, 1960, the 727 was launched with 40 orders each from United Airlines and Eastern Air Lines.
The first 727-100 rolled out on November 27, 1962, first flew on February 9, 1963, and entered service with Eastern on February 1, 1964.
The only trijet aircraft to be produced by Boeing, the 727 is powered by three Pratt & Whitney JT8D low-bypass turbofans below a T-tail, one on each side of the rear fuselage and a center one fed through an S-duct below the tail.
It shares its six-abreast upper fuselage cross-section and cockpit with the 707 that was also later used on the 737.
The 727-100 typically carries 106 passengers in two classes over, or 129 in a single class.
Launched in 1965, the stretched 727-200 flew in July 1967 and entered service with Northeast Airlines that December.
The longer variant typically carries 134 passengers in two classes over, or 155 in a single class.
A freighter and a "Quick Change" convertible version were also offered.
The 727 was used for domestic flights and on international flights within its range.
Airport noise regulations have led to hush kit installations.
Its last commercial passenger flight was in January 2019.
It was succeeded by the 757 and larger variants of the 737.
There have been 353 incidents involving the Boeing 727.
Production ended in September 1984 with 1,832 having been built. The 727 was an industry workhorse for many years, often fondly referred to as "the DC-3 of the Jet Age."
Development
The Boeing 727 design was a compromise among United Airlines, American Airlines, and Eastern Air Lines; each of the three had developed requirements for a jet airliner to serve smaller cities with shorter runways and fewer passengers. United Airlines requested a four-engine aircraft for its flights to high-altitude airports, especially its hub at Stapleton International Airport in Denver, Colorado. American Airlines, which was operating the four-engined Boeing 707 and Boeing 720, requested a twin-engined aircraft for efficiency. Eastern Airlines wanted a third engine for its overwater flights to the Caribbean, since at that time twin-engine commercial flights were limited by regulations to routes with 60-minute maximum flying time to an airport. Eventually, the three airlines agreed on a trijet design for the new aircraft.In 1959, Lord Douglas, chairman of British European Airways, suggested that Boeing and de Havilland Aircraft Company work together on their trijet designs, the 727 and D.H.121 Trident, respectively. The two designs had a similar layout, the 727 being slightly larger. 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. Boeing and de Havilland each sent engineers to the other company's locations to evaluate each other's designs, but Boeing eventually decided against the joint venture. De Havilland had wanted Boeing to license-build the D.H.121, while Boeing felt that the aircraft needed to be designed for the American market, with six-abreast seating and the ability to use runways as short as.
In 1960, Pratt & Whitney was looking for a customer for its new JT8D turbofan design study, based on its J52 turbojet, while United and Eastern were interested in a Pratt & Whitney alternative to the RB163 Spey. Once Pratt & Whitney agreed to go ahead with development of the JT8D, Eddie Rickenbacker, chairman of the board of Eastern, told Boeing that the airline preferred the JT8D for its 727s. Boeing had not offered the JT8D, as it was about heavier than the RB163, though slightly more powerful; the RB163 was also further along in development than the JT8D. Boeing reluctantly agreed to offer the JT8D as an option on the 727, and it later became the sole powerplant.
With high-lift devices on its wing, the 727 could use shorter runways than most earlier jets.
A later 727 model, the 727-200, was stretched by 20 feet to carry 58 more passengers and replaced earlier jet airliners on short- and medium-haul routes such as the Boeing 707 and Douglas DC-8, as well as aging propeller airliners such as the DC-4, DC-6, DC-7, and the Lockheed Constellations.
For over a decade, more 727s were built per year than any other jet airliner; in 1984, production ended with 1,832 built and 1,831 delivered, the highest total for any jet airliner until the 737 surpassed it in the early 1990s.
Design
The airliner's middle engine at the very rear of the fuselage gets air from an inlet ahead of the vertical fin through an S-shaped duct. This S-duct proved to be troublesome in that flow distortion in the duct induced a surge in the centerline engine on the take-off of the first flight of the 727-100. This was fixed by the addition of several large vortex generators in the inside of the first bend of the duct.The 727 was designed for smaller airports, so independence from ground facilities was an important requirement. This led to one of the 727's most distinctive features: the built-in airstair that opens from the rear underbelly of the fuselage, which initially could be opened in flight. Hijacker D. B. Cooper used this hatch when he parachuted from the back of a 727, as it was flying over the Pacific Northwest. Boeing subsequently modified the design with the Cooper vane so that the airstair could not be lowered in flight. The design included an auxiliary power unit, which allowed electrical and air-conditioning systems to run independently of a ground-based power supply, and without having to start one of the main engines. An unusual design feature is that the APU is mounted in a hole in the keel beam web, in the main landing gear bay. The 727 is equipped with a retractable tailskid that is designed to protect the aircraft in the event of an over-rotation on takeoff. The 727's fuselage has an outer diameter of. This allows six-abreast seating and a single aisle when wide coach-class seats are installed. An unusual feature of the fuselage is the difference between the lower lobe forward and aft of the wing as the higher fuselage height of the center section was simply retained towards the rear.
Nosewheel brakes were available as an option to reduce braking distance on landing, which provided reduction in braking distances of up to.
File:AeroSur Boeing 727 Tail.jpg|thumb|Tail of a Boeing 727 with its distinctive T-tail and S-shaped duct feeding the center engine in the tail cone.
The 727 proved to be such a reliable and versatile airliner that it came to form the core of many startup airlines' fleets. The 727 was successful with airlines worldwide partly because it could use smaller runways while still flying medium-range routes. This allowed airlines to carry passengers from cities with large populations, but smaller airports to worldwide tourist destinations. One of the features that gave the 727 its ability to land on shorter runways was its clean wing design. With no wing-mounted engines, leading-edge devices and trailing-edge lift enhancement equipment could be used on the entire wing. Together, these high-lift devices produced a maximum wing lift coefficient of 3.0. The 727 was stable at very low speeds compared to other early jets, but some domestic carriers learned after review of various accidents that the 40° flap setting could result in a higher-than-desired sink rate or a stall on final approach. These carriers' Pilots' Operation Handbooks disallowed using more than 30° of flaps on the 727, even going so far as installing plates on the flap lever slot to prevent selection of more than 30° of flaps.
Noise
The 727 is one of the noisiest commercial jetliners, categorized as Stage 2 by the U.S. Noise Control Act of 1972, which mandated the gradual introduction of quieter Stage 3 aircraft. 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. When the Stage 3 requirement was being proposed, Boeing engineers analyzed the possibility of incorporating quieter engines on the 727. They determined that the JT8D-200 engine could be used on the two side-mounted pylons. The JT8D-200 engines are much quieter than the original JT8D-1 through -17 variant engines that power the 727, as well as more fuel efficient due to the higher bypass ratio, but the structural changes to fit the larger-diameter engine into the fuselage at the number two engine location were prohibitive.Current regulations require that a 727, or any other Stage 2 noise jetliner in commercial service must be retrofitted with a hush kit to reduce engine noise to Stage 3 levels to continue to fly in U.S. airspace. These regulations have been in effect since December 31, 1999. One such hush kit is offered by FedEx, and has been purchased by over 60 customers. Aftermarket winglet kits, originally developed by Valsan Partners and later marketed by Quiet Wing Corp. have been installed on many 727s to reduce noise at lower speeds, as well as to reduce fuel consumption. In addition, Raisbeck Engineering developed packages to enable 727s to meet the Stage 3 noise requirements. These packages managed to get light- and medium-weight 727s to meet Stage 3 with simple changes to the flap and slat schedules. For heavier-weight 727s, exhaust mixers must be added to meet Stage 3. American Airlines ordered and took delivery of 52 Raisbeck 727 Stage 3 systems. Other customers included TWA, Pan Am, Air Algérie, TAME, and many smaller airlines.
Since September 1, 2010, 727 jetliners are banned from some Australian airports because they are too loud.
Operational history
In addition to domestic flights of medium range, the 727 was popular with international passenger airlines. The range of flights it could cover meant that the 727 proved efficient for short- to medium-range international flights in areas around the world.The 727 also proved popular with cargo and charter airlines. FedEx Express introduced 727s in 1978. The 727s were the backbone of its fleet until the 2000s; FedEx began replacing them with Boeing 757s in 2007. Many cargo airlines worldwide employ the 727 as a workhorse, since, as it is being phased out of U.S. domestic service because of noise regulations, it becomes available to overseas users in areas where such noise regulations have not yet been instituted. Charter airlines Sun Country, Champion Air, and Ryan International Airlines all started with 727 aircraft.
The 727 had some military uses as well. Since the aft stair could be opened in flight, the Central Intelligence Agency used them to drop agents and supplies behind enemy lines in Vietnam. In early 1988, The Iraqi Air Force modified a Boeing 727 by fitting it with Thomson-CSF TMV-018 Syrel pods for ESM and Raphael-TH pods with side looking radar. Known as 'Faw-727', it was reportedly used as an ELINT platform in the invasion of Kuwait in 1990 and the subsequent Iraqi monitoring of Coalition forces during Desert Shield.
The 727 has proven to be popular where the airline serves airports with gravel, or otherwise lightly improved, runways. The Canadian airline First Air, for example, previously used a 727-100C to serve the communities of Resolute Bay and Arctic Bay in Nunavut, whose Resolute Bay Airport and former Nanisivik Airport both have gravel runways. The high-mounted engines greatly reduce the risk of foreign object damage.
A military version, the Boeing C-22, was operated as a medium-range transport aircraft by the Air National Guard and National Guard Bureau to airlift personnel. A total of three C-22Bs were in use, all assigned to the 201st Airlift Squadron, District of Columbia Air National Guard.
At the start of the 21st century, the 727 remained in service with a few large airlines. Faced with higher fuel costs, lower passenger volumes due to the post-9/11 economic climate, increasing restrictions on airport noise, and the extra expenses of maintaining older planes and paying flight engineers' salaries, most major airlines phased out their 727s; they were replaced by twin-engined aircraft, which are quieter and more fuel-efficient. Modern airliners also have a smaller flight deck crew of two pilots, while the 727 required two pilots and a flight engineer. Delta Air Lines, the last major U.S. carrier to do so, retired its last 727 from scheduled service in April 2003. Northwest Airlines retired its last 727 from charter service in June 2003. Many airlines replaced their 727s with either the 737-800 or the Airbus A320; both are close in size to the 727-200., a total of 109 Boeing 727s were in commercial service with 34 airlines; three years later, the total had fallen to 64 airframes in service with 26 airlines.
On March 2, 2016, the first 727 produced, which first flew on February 9, 1963, made a flight to a museum after extensive restoration. The 727-100 had carried about three million passengers during its years of service. Originally a prototype, it was later sold to United Airlines, which donated it to the Museum of Flight in Seattle in 1991. The jet was restored over 25 years by the museum and was ferried from Paine Field in Everett, Washington to Boeing Field in Seattle, where it was put on permanent display at the Aviation Pavilion. The Federal Aviation Administration granted the museum a special permit for the 15-minute flight. The museum's previous 727-223, tail number N874AA, was donated to the National Airline History Museum in Kansas City and was planned to be flown to its new home once FAA ferry approval was granted. After a series of financial problems with the restoration, N874AA was seized by Boeing Field for nonpayment of storage fees in 2021 and subsequently broken up and scrapped.
Iran Aseman Airlines, the last passenger airline operator, made the worldwide last scheduled 727 passenger flight on January 13, 2019 between Zahedan and Tehran.