Boeing 720

The Boeing 720 is an American narrow-body airliner produced by Boeing Commercial Airplanes. Announced in July 1957 as a 707 derivative for shorter flights from shorter runways, the 720 first flew on November 23, 1959. Its type certificate was issued on June 30, 1960, and it entered service with United Airlines on July 5, 1960. A total of 154 Boeing 720s and 720Bs were built until 1967. As a derivative, the 720 had low development costs, allowing profitability despite few sales.

Boeing 720
The 720 is similar to the Boeing 707 with a slightly shorter fuselage
Role Narrow-body jet airliner
National origin United States
Manufacturer Boeing Commercial Airplanes
First flight November 23, 1959
Introduction July 5, 1960, with United Airlines
Retired September 29, 2010[1]
Status Retired
Primary users United Airlines
Western Airlines
Eastern Airlines
Northwest Airlines
Produced 1958–1967
Number built 154[2]
Developed from Boeing 707

Compared to the 707-120, it has a length reduced by 9 feet (2.7 m), a modified wing and a lightened airframe for a lower maximum takeoff weight. Originally designed to be powered by four Pratt & Whitney JT3C turbojets, the initial 720 would cover a 2,800 nmi (5,200 km) range with 131 passengers in two classes. The reconfigured 720B, powered by JT3D turbofans, first flew on October 6, 1960, and entered service in March 1961. It could seat 156 passengers in one class over a 3,200 nmi (5,900 km) range. Some 720s were later converted to 720Bs specification. It was succeeded by the Boeing 727 trijet. The 720 is the only Boeing-designed jetliner that does not follow the "7x7" naming scheme.

Development

Shorter range 707
The Boeing 720 made its maiden flight on November 23, 1959

Boeing announced its plans to develop a new version of the 707 in July 1957.[2] It was developed from the 707-120 to provide for short- to medium-range flights from shorter runways. The model was originally designated 707-020 before being changed to 720 at the input of United Airlines.[3] Compared to the 707-120, it has four fewer frames in front of the wing and one fewer aft: a total length reduction of 8 feet 4 inches (2.54 m).[4]

The new model was designed to a lower maximum takeoff weight with a modified wing and a lightened airframe. The wing modifications included Krueger flaps outboard of the outboard engines, lowering take-off and landing speeds—thus shortening runway length requirements—and a thickened inboard leading edge section, with a slightly greater sweep. This modification increased the top speed over the 707-120.[4] It had four Pratt & Whitney JT3C-7 turbojet engines producing 12,500 lbf (55.6 kN) each.[5]

At one point in the development phase, it was known as the 707-020, then 717-020,[3] although this was the Boeing model designation of the KC-135 and remained unused for a commercial airliner until it was applied to the MD-95, following Boeing's merger with McDonnell Douglas in 1997.[6]

Because the aircraft systems were similar to the Boeing 707, no prototype Boeing 720 was built; any different systems were tested on the Boeing 367-80.[7] The first 720 took its maiden flight on November 23, 1959.[4] The type certificate for the 720 was issued on June 30, 1960. It was first entered service with United Airlines on July 5, 1960;[4] 65 of the original version were built.[8]

Further developments

The 720B version of the 720 had JT3D turbofan engines,[4] producing 17,000 lbf (75.6 kN) each.[5] The JT3D engines had lower fuel consumption and higher thrust.[9] The maximum takeoff weight for the 720B was increased to 234,000 lb (106,000 kg). The 720B first took to the skies on October 6, 1960, and received certification and entered service with American Airlines in March 1961;[5] 89 720Bs were built,[8] in addition to conversions of American's 10 existing 720s.[10]

As a modification of an existing model, the 720 had minimal research and development costs, which allowed it to be successful despite few sales.[11] The company built 154 Boeing 720s and 720Bs from 1959 to 1967.[12] The 720's wing modification was later added on the 707-120B and on 707-120s retrofitted to the B standard.[13]

Design
The 720 is slightly shorter than the 707 and has a modified wing

The Boeing 720 is a four-engined low-wing cantilever monoplane. Although it was similar to the Boeing 707, compared with the 707-120, it was 9 ft (2.74 m) shorter in length,[3] and had a lighter structure through use of lighter forged metal parts and thinner fuselage skins and structures.[11]

Fuselage

The rearmost of the 707's over-wing emergency exits was deleted on each side, which reduced passenger capacity, while two over-wing exits were an option for higher-density configurations.[11]

Wings

The 720 uses an improved wing based on the 707 wing. The wingspan remained the same as the 707-120. For the 720, the wing was changed between the fuselage and inner engines by adding a wing root glove.[14][15] This glove reduced the drag of the wing by decambering the root, which reduced the "middle effect", thereby increasing the effective local wing sweep. The wing root glove reportedly increased the drag divergence Mach number of the wing by Mach 0.02.[16]

Engines

Though initially fitted with turbojet engines, the dominant engine for the Boeing 720 was the Pratt & Whitney JT3D, a turbofan variant of the JT3C with lower fuel consumption and higher thrust. JT3D-engined 720s had a "B" suffix; some of American's 720Bs were conversions of JT3C-powered 720s.[9]

Like the 707, the 720/720B used engine-driven turbocompressors to supply high-pressure air for cabin pressurization. The engines could not supply sufficient bleed air for this purpose without a serious loss of thrust. The small air inlets and associated humps are visible just above the main engine inlets on the two inner engine pods of all 720s and 720Bs; the lack of the turbocompressor inlet on the outer starboard pod (number 4 engine) helps spotters distinguish 720/720Bs from most 707s, which had three turbocompressors.

The Boeing 720 flight deck

Other equipment

The Boeing 720 lacked an auxiliary power unit, and relied instead on ground power and pneumatic air to power the aircraft's systems, provide air conditioning, and start the engines while on the ground. The normal practice for Boeing 720 aircraft was to start the number three (inner starboard) engine first, then disconnect ground power and air. After start of the first engine, the use of bleed air from that engine could be used to provide necessary air pressure to start the other engines one by one. On ground, with ground starting crew at hand, all four engines were usually started with ground crew help: this was more reliable and faster.

Operational history
United Airlines introduced the 720 on July 5, 1960.[8]

The first aircraft was a production aircraft for United Airlines which flew on November 23, 1959. The type certificate for the 720 was issued on June 30, 1960. The first service of the 720 was by United Airlines on July 5, 1960[8] on the Los Angeles-Denver-Chicago route. American Airlines followed by putting the 720 in commercial operation on July 31 that same year. On January 2, 1962, Pakistan International Airlines′ first Boeing 720B – a Boeing 720-040B (registration AP-AMG) piloted by Captain Abdullah Baig and copilot Captain Taimur Baig – set a world record during the London-to-Karachi leg of its delivery flight to Pakistan for speed over a commercial air route, making the flight in 6 hours 43 minutes 55 seconds at an average speed of 938.78 km/h (583.33 mph).[17][18]

The 720 was supplanted by the Boeing 727 in the mid-1960s in its medium-range, high-performance market.[3] In the late 1960s, 720 and 720B aircraft were used by the US military to shuttle troops to the Far-East war efforts. The interiors of these planes were stripped of class partitions. Some of these flights originated at Travis AFB California and flew nonstop to Japan. At least one of the landing sites was Yokota AB, Japan, before the troops traveled to their final destinations.

After disposal of 720s by the major airlines, many were acquired by second-rank operators in South America and elsewhere.

The Controlled Impact Demonstration used a FAA 720

In 1984, a Boeing 720 flown by remote control was intentionally crashed at Edwards AFB as a part of the FAA and NASA Controlled Impact Demonstration program. The test provided peak accelerations during a crash. The performance of fire-retardant fuel was also tested.[19]

The first 720 (N7201U) was later renamed "The Starship" and became a private charter jet used mainly by touring rock bands. Its main user was Led Zeppelin in the 1970s. The seating capacity was reduced and a bar with a built-in electric organ was added, along with beds, a shower, a lounge area, a TV, and video cassette player.[20]

Honeywell operated the last Boeing 720 in the United States, flying out of Sky Harbor airport in Phoenix. The aircraft had been modified with an extra engine nacelle mounted on the right side of the fuselage to allow testing of a turbine engine at altitude, operating on special certification allowing it to be used for experimental use. This 720B was scrapped on June 21 and 22, 2008.[21] Honeywell replaced their aircraft with a Boeing 757.

Pratt & Whitney Canada operated the last flying 720 until 2010. Its final operational flight occurred on September 29, 2010.[22] Pratt & Whitney Canada replaced the testbed with a Boeing 747SP.[1] In May 2012, the former PWC 720 was flown to CFB Trenton, Ontario, to be put on display at the National Air Force Museum of Canada.[23]

Variants
720
First production variant with four Pratt & Whitney JT3C turbojet engines
Several high-density seat configurations delivered to Eastern Airlines included four over-wing escape hatches and brake cooling fans to effect quick turns on short-haul sectors. These aircraft, designated "720-025", were certificated to carry up to 170 passengers, provided that certain safety requirements were met.[24]
720B
Improved variant with four Pratt & Whitney JT3D turbofan engines, American Airlines converted its 720s to 720B standard.[9]

Operators

These operators flew Boeing 720/720Bs (● = Original Operators):

 Afghanistan
 Belize
 Cambodia
 Ceylon
 Colombia
 Democratic Republic of the Congo
 Denmark
 Dominican Republic
 Ecuador
 Ethiopia
 France
 Germany
 Greece
 Iceland
 India
 Indonesia
  • Air Bali 1 x 720 leased in 1975 but airline failed to gain approval for charter flights to the United States.[25]
 Ireland
 Israel
  • El Al ● 2 x 720B delivered in 1962[25]
  • MAOF airlines 2 x 720B bought from Monarch in 1981[26]
 Jordan
  • Alia - Royal Jordanian Airlines 2 x 720B[25]
 Kenya
 Lebanon
 Malta
 Mexico
 Nicaragua
 Norway
 Pakistan
 Papua New Guinea
 Rhodesia
 Saudi Arabia
 Tanzania
 United Kingdom
 United States
 Yemen

Accidents and incidents
A Middle East Airlines 720 destroyed during Operation Peace for Galilee
Main article: List of accidents and incidents involving the Boeing 707

The Boeing 720 has had 23 hull-loss accidents during its career; it was also involved in a number of incidents including nine hijack incidents and one aircraft destroyed by a bomb in mid-air in 1976. Only 12 of the hull-loss accidents included fatalities which totaled 175 deaths in addition to the 81 deaths on the aircraft destroyed in mid-air by a bomb.[43]

The worst accidents were:[43]

  • On February 12, 1963, Northwest Airlines Flight 705, a Boeing 720-051B (reg. N724US), suffered an in-flight break-up over the Florida Everglades about 12 minutes after leaving Miami, bound for Chicago. All 35 passengers and eight crew died. The cause of the crash was determined to be an unrecoverable loss of control due to severe turbulence.[44]
  • On May 20, 1965, Pakistan International Airlines Flight PK 705, 720-040B (reg AP-AMH), crashed short of the runway at Cairo International Airport, killing 121 of the 127 people on board.[45]
  • On December 8, 1972, seven members of the Eritrean Liberation Front hijacked Ethiopian Airlines Flight 708, a Boeing 720-060B, on its way to Paris. Security forces on the plane immediately opened fire, killing all but one of the highjackers (the last surviving hijacker later died in hospital). During the altercation, a hand grenade was detonated that damaged control cables under the cabin floor. However, the pilot put the plane into a controlled dive and managed to land the plane safely back in Addis Ababa with no further casualties.
  • On January 1, 1976, Middle East Airlines Flight 438, a Boeing 720-023B (reg. OD-AFT), was destroyed en route from Beirut to Dubai by a bomb in the forward cargo hold. All 66 passengers and 15 crew were killed.[46]

Aircraft on display

Specifications
Airplane characteristics[55]
Variant 720 720B
Cockpit crew three (Pilot, Copilot, Flight Engineer)[56]
Passengers 131-137 in two classes, 156 in one class
Length 136 ft 2 in / 41.50 m136 ft 9 in / 41.68 m
Wingspan 130 ft 10 in / 39.88 m
Fuselage width 12 ft 4 / 3.76 m
Tail height 41 ft 5 in / 12.62 m41 ft 2 in / 12.55 m
MTOW 229,300 lb / 104.0 t234,300 lb / 106.2 t
Empty weight 110,800 lb / 50.3115,000 lb / 52.2 t
Fuel Capacity 16,060 US gal / 60.9 m³16,130 US gal / 61.3 m³
Engines (4 x) Pratt & Whitney JT3C-7Pratt & Whitney JT3D-1/3
Unit thrust 12,000 lbf (53.4 kN)17,000–18,000 lbf (75.6–80.1 kN)
MMo Mach 0.906 (520 kn; 962 km/h)[56]
Ceiling 42,000 ft (12,802 m)[56]
Range 2,800 nmi (5,200 km)[lower-alpha 1]3,200 nmi (5,900 km)[lower-alpha 2]
Takeoff (MTOW) 9,000 ft (2,700 m)6,500 ft (2,000 m)
Landing (MLW) 6,200 ft (1,900 m)6,300 ft (1,900 m)
  1. 131 passengers
  2. 156 passengers

See also

Related development

Aircraft of comparable role, configuration, and era

Related lists

References
Notes
  1. Niles, Russ. "Last Boeing 720 Retired". avweb.com, October 5, 2010. Retrieved: October 18, 2020.
  2. Angelucci, Enzo; Paolo Matricardi and Adriano Zannino. The Illustrated Encyclopedia of Civil Aircraft: From Leonardo da Vinci to the Present, p. 346. Edison, New Jersey US: Chartwell Books, 2001. ISBN 0-7858-1389-6.
  3. "Boeing 720". Boeing Commercial Airplanes. Archived from the original on September 3, 2011. Retrieved July 7, 2011.
  4. Frawley, Gerald. "Boeing 720". The International Directory of Civil Aircraft, 2003/2004. Fishwick, Act: Aerospace Publications, 2003. ISBN 1-875671-58-7.
  5. Donald, David, ed. The Complete Encyclopedia of World Aircraft. New York: Barnes & Noble Books, 1997. ISBN 0-7607-0592-5.
  6. Lombardi, Michael. "The first KC-135 rolled out 50 years ago this month." Historical Perspective, Start of a Proud Mission: Boeing Frontiers. Boeing, July 2006. Retrieved: April 17, 2010.
  7. Pither 1998, p. 29.
  8. Boeing 720 Archived September 3, 2011, at the Wayback Machine. Boeing
  9. "Boeing 720". Airliners.net. Retrieved January 10, 2012.
  10. Pither 1998, p. 30
  11. Proctor, Jon; Mike Machat; Craig Kodera (2010). From Props to Jets: Commercial Aviation's Transition to the Jet Age 1952–1962. North Branch, MN: Specialty Press. p. 118-120. ISBN 978-1-58007-146-8.
  12. "Boeing 707/720 Short History." Archived June 29, 2011, at the Wayback Machine Boeing. Retrieved: December 27, 2009.
  13. "Boeing 707." airlinercafe.com. Retrieved: December 27, 2009.
  14. "The Boeing 720". Flight, August 19, 1960.
  15. The Ultimate Boeing 707 Guide Retrieved September 5, 2011.
  16. Cook, William H. The Road to the 707: The Inside Story of Designing the 707. Bellevue, Washington: TYC Publishing, 1991. ISBN 978-0-9629605-0-5.
  17. "FAI Record ID #7679". Archived from the original on September 22, 2017. Retrieved January 1, 2017.
  18. fai.org via historyofpia.com "1962 - PIA Boeing 720B Record Flight Info on FAI Website"
  19. "Flight test experience and controlled impact of a remotely piloted jet transport aircraft, NASA-TM-4084." NASA, November 1, 1988. Retrieved: December 27, 2009.
  20. Film The Song Remains The Same
  21. "Resident Boeing 720B." visitingphx.com. Retrieved: December 27, 2009.
  22. P&WC Boeing 720B “Red” Flying Test Bed bids farewell
  23. Lessard, Jerome (May 10, 2012). "Historic landing a success". Trentonian.ca. Trenton Trentonian. Archived from the original on September 12, 2012. Retrieved March 27, 2013.
  24. FAA Type Certificate Data Sheet http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/b72df74d3b1847ad852567240060a02d/$FILE/4a28.PDF
  25. Pither 1998, pp. 116-219.
  26. "Israeli Upstart: MAOF Airlines". YESTERDAY'S AIRLINES. May 5, 2020. Retrieved July 21, 2020.
  27. "History of Air Rhodesia." Viscounts in Africa: The Air Rhodesia Story. Retrieved: 7 February 2014.
  28. "Alaska Airlines" by Cliff & Nancy Hollenbeck, 2012, published by Hollenbeck Productions, http://www.hollenbeckproductions.com
  29. "Character & Characters: The Spirit of Alaska Airlines" by Robert J. Serling, 2008, published by Documentary Media LLC, http://www.documentarymedia.com
  30. Pither 1998, p. 133.
  31. Pither 1998, p. 142.
  32. Bohl, Walt, The Aircraft History of Capital Airlines, American Aviation Historical Society Journal, Aviation Historical Society, Huntington Beach, California, Spring 2001, page 23
  33. Pither 1998, p. 151.
  34. Pither 1998, pp. 154–155.
  35. Federal Aviation Administration (September 1987). "Full-Scale Transport Controlled Impact Demonstration Program" (PDF). Atlantic City International Airport, New Jersey: FAA Technical Center. p. 5. DOT/FAA/CT-87/10, NASA-TM-89642. Retrieved September 2, 2014. This was the first time that a four-engine jet aircraft (Boeing 720) had been flown successfully by remote control. It was also the first time that an aircraft was flown solely and successfully on antimisting kerosene fuel (AMK).
  36. Pither 1998, p. 158.
  37. Pither 1998, pp. 183–184.
  38. Pither 1998, pp. 186–187.
  39. Pither 1998, pp. 187.
  40. Pither 1998, p. 211
  41. Pither 1998, pp. 212–213.
  42. Pither 1998, p. 215-216.
  43. "Boeing 720". Aviation Safety Network. Retrieved October 19, 2013.
  44. "Northwest Airlines flight 705." Aviation-Safety.net. Retrieved: December 27, 2009.
  45. "ASN Aircraft accident Boeing 720-040B AP-AMH Cairo International Airport (CAI)". Aviation-safety.net. May 20, 1965. Retrieved March 27, 2013.
  46. Bladd, Joanne. "MEA flight 438." Aviation-Safety.net. Retrieved: December 27, 2009.
  47. Pither 1998, p. 311.
  48. PIA Planetarium, Lahore
  49. "AP-AXL - All Pakistan Aircraft Registration Marks". www.aparm.net. Retrieved August 26, 2017.
  50. PIA Planetarium, Karachi
  51. "AP-AXM - All Pakistan Aircraft Registration Marks". www.aparm.net. Retrieved August 26, 2017.
  52. "B720 « National Air Force Museum of Canada". airforcemuseum.ca. Retrieved August 26, 2017.
  53. Pither 1998, p. 308.
  54. Franco, Javier. "Uniendo el maletín retro de Avianca con sus Boeing 720 y 727". Retrieved December 26, 2014.
  55. "707 Airplane Characteristics: Airport Planning" (PDF). Boeing. May 2011.
  56. "Type certificate data sheet No. 4A28" (PDF). FAA. May 1, 1973.
Bibliography

Further reading
  • "707/720 Commercial Transport > Historical Snapshot". Boeing.
  • Caidin, Martin. Boeing 707. New York: Bantam Books, 1959.
  • Price, Alfred. The Boeing 707. Leatherhead, Surrey, UK: Profile Publications, 1967.
  • Schiff, Barry J. The Boeing 707. Blue Ridge Summit, PA: Tab Books, 1982, First edition 1967, . ISBN 0-8168-5653-2.
  • Whittle, John A. The Boeing 707 and 720. Tonbridge, Kent: Air Britain (Historians), 1972. ISBN 0-85130-025-1.
  • Bradley, Catherine. Boeing 707 Super Profile. Yeovil, Somerset UK: Haynes Publishing, 1983. ISBN 0-85429-356-6.
  • Lloyd, Alwyn T. Boeing 707 & AWACS in Detail and Scale. Falbrook, CA: Aero Publishers, 1987. ISBN 0-8306-8533-2.
  • Bowers, Peter M. (1989). Boeing Aircraft since 1916. London: Putnam Aeronautical Books, 1989. ISBN 0-85177-804-6.
  • Cook, William H. Road to the 707: The Inside Story of Designing the 707. Bellevue, WA: TYC Publishing Company, 1991. ISBN 0-9629605-0-0.
  • Cearley, George Walker. Boeing 707 & 720: A Pictorial History. Dallas, TX: G.W. Cearley Jr, 1993. No ISBN.
  • Smith, Paul Raymond. Boeing 707 – Airline Markings No. 3. Shrewsbury, Shropshire, UK: Swan Hill Press, 1993. ISBN 1-85310-087-0.
  • Irving, Clive (1994). Wide Body: The Making of the Boeing 747. Philadelphia: Coronet, 1994. ISBN 0-340-59983-9.
  • Wilson, Stewart. Boeing 707, Douglas DC-8, and Vickers VC-10. Fyshwick, Australia, ACT: Aerospace Publications Pty Ltd., 1998. 1-875671-36-6.
  • Francillon, René. Boeing 707: Pioneer Jetliner. Shrewsbury, Shropshire, UK: Motor Books International, 1999. ISBN 0-7603-0675-3
  • Wilson, Stewart (1999). Airliners of the World. Fyshwick, ACT, Australia: Aerospace Publications Pty Ltd., 1999. ISBN 1-875671-44-7.
  • Proctor, Jon (2001). Boeing 720. Miami, FL: World Transport Press. ISBN 1-892437-03-1.
  • Winchester, Jim. Boeing 707. Shrewsbury, Shropshire, UK: Airlife, 2002. ISBN 1-84037-311-3.
  • Stachiw, Anthony L. and Andrew Tattersall. Boeing CC137 (Boeing 347C) in Canadian Service. St. Catherines, ON: Vanwell Publishing Ltd., 2004. ISBN 1-55125-079-9.
  • Breffort, Dominique. Boeing 707, KC-135 and Civilian and Military Versions. Paris: Histoire & Collections, 2008. ISBN 978-2-35250-075-9.

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