Boeing 747SP
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| Boeing 747SP | |
|---|---|
 Bahrain Royal Flight Boeing 747SP |
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| Type | Airliner |
| Manufacturer | Boeing Commercial Airplanes |
| Designed by | Joe Sutter |
| Introduced | 1976 |
| Status | Discontinued, limited service |
| Primary users | Pan Am United Airlines South African Airways Iran Air |
| Produced | 1976-1989 |
| Number built | 45 |
| Developed from | Boeing 747 |
The Boeing 747SP is a highly modified version of Boeing's Boeing 747-100 offering 'special performance'. Known during development as the 'short body' 747SB, the shortened fuselage permitted longer range flights to be made.
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[edit] Background
The 747SP was offered to customers in 1974, and the first airframe was delivered in 1976. A shorter derivative of the 747-100, the SP was developed to target two market requirements. The first addressed a need to compete with the DC-10 and L-1011 while maintaining commonality with larger 747s. The 747 was too big for many routes, and Boeing did not have a mid-sized widebody to compete in the segment of the market that the DC-10 and L-1011 had created. The second market requirement was the ultra long-range routes which were emerging in the mid-1970s. These routes needed not only longer range, but also higher cruising speeds. Boeing could not afford to develop an all-new design, instead shortening the 747 and re-optimized it for speed and range at the expense of capacity.
[edit] Development
Apart from having a significantly shorter fuselage and one fewer cabin door per side, the 747SP differs from other 747 variants in having simplified flaps and in having a taller vertical tail to counteract the decrease in yaw moment-arm from the shortened fuselage. The 747SP uses larger single-piece flaps on the trailing edges rather than the triple-slotted flaps found on standard 747s. The SP was also the first Boeing widebody to have a wingspan measuring longer than the length of the plane; its wingspan measures 196 feet across while its length is 184 feet. The other aircraft with a wider wingspan than body is the Boeing 777-200LR.
The SP could accommodate 230 passengers in a 3-class cabin or 331 in a (303 economy, 28 business) 2-class cabin, and a maximum of 440 passengers in one class. Originally designated 747SB for "short body", it later was nicknamed "Sutter's balloon" by employees after 747 chief engineer Joe Sutter.[1] Boeing later changed the production designation to 747SP for "special performance", reflecting the aircraft's longer range and faster cruise speed. Pan Am was the launch customer for the 747SP, taking the first delivery, Clipper Freedom, on March 5, 1976,[2] followed by Iran Air.
The 747SP was the longest-range airliner available until the 747-400 entered service in 1987. For all its technical achievements, the SP never sold as well as Boeing hoped. Increased fuel prices in the mid 70s to early 80s, its heavy wingspan, reduced capacity, and the increased range of forthcoming planes were some of the many factors that contributed to its low sales. Only 45 were ever built and most still in service are used by operators in the Middle East. However, some of the engineering work on the 747SP was reused with the development of the 747-300 and 747-400. In the 747SP, the upper deck begins over the section of fuselage that contains the wingbox, not ahead of the wingbox as is the case with the 747-100 and 747-200. This same design was used in the 747-300 and 747-400 resulting in a stretched upper deck.
Production of the 747SP ran from 1976 to 1983. However an order for the Royal Flight of Bahrain led Boeing to produce one last SP in 1987.
A special 747SP is the SOFIA infrared astronomical observatory, where the airframe was modified to carry a 2.5-meter-diameter infrared reflecting telescope to high altitude, above most of the infrared-absorbing water vapor in the atmosphere. Originally delivered to Pan Am and titled "Clipper Lindbergh", NASA has the name displayed in Pan Am script on the plane.
[edit] Operators
Forty-five 747SP aircraft were built between 1974 and 1989. As of August, 2007, 17 are still flying, 15 have been scrapped, and 13 are in storage, awaiting salvage or on display in museums.[3]
[edit] Active service
- VIP Government of Yemen (1)
- VIP Government of Qatar (1)
- VIP Government of Saudi Arabia (2)
- VIP Government of Bahrain (2)
- VIP Government of Oman (1)
- SOFIA Astronomical Observatory (1)
- Las Vegas Sands Group (1)
- Iran Air (in passenger operation) (3)
- Saudia (in passenger operation) (1)
- Pratt & Whitney Flight Test (1)
- Ernest Angley Ministries (1)
[edit] Former customers
- Pan Am took delivery of ten 747SP-21 aircraft between 1976 and 1979, operating them on trans-Pacific routes to Asia and Oceania as well as to the Middle East. The aircraft and routes were sold to United Airlines in 1986, and remained in operation until 1994.
- Iran Air took delivery of four 747SP-86 aircraft between 1976 and 1978. Prior to the 1979 Islamic revolution, the aircraft were used on the daily Tehran-New York flight, at the time the longest non-stop airline route in the world. Three of those four are still in service in 2007, and there are rumors that the fourth may be returned to service as well.
- South African Airways operated six 747SP-44 aircraft on flights from Johannesburg to London and other European destinations during the apartheid years, when that airline's aircraft were not allowed to fly over African countries and had to fly around the Bulge of Africa. The extra range allowed the aircraft to cover the additional distance nonstop. The sole remaining South African Airways 747SP - the "Maluti" - was decommissioned on 30 September 2006 with a final flight to Rand Airport where it will remain on show as a static display/museum aircraft. (This final transport flight was the aircraft's first flight in three years.)
- TWA operated three 747SP-31 aircraft from 1979 to 1986. These aircraft were for long distance routes to the Middle East which never materialized. Two of these were purchased by American Airlines and used on London and Tokyo routes until 1992.
- Qantas operated two 747SP-38 aircraft from 1980 to 2004. These aircraft were used for flights between Australia and Wellington, due to Wellington's short runway but still able to meet passenger number requirements,[5] as well as transpacific service between Sydney and Los Angeles.
They were equipped with Rolls-Royce engines, unlike most other 747-SP's.
- Braniff took delivery of 3 747SP's for their ultra-longhaul routes in the Pacific. They were fitted with 300 seats in a luxurious cabin and an all-orange exterior.[6]. Of the three planes, as of August 2006, one has been scrapped and one is in VIP service with Yemen government. The third was formerly in VIP service with the Oman government, but was recently sold to the owners of Fry's Electronics. This may be now be the Las Vegas Sands Group operational aircraft.
- The type was popular with airlines in East Asia, as it was the only type which has the range to fly between East Asia and North America non-stop both ways until the 747-400 was introduced. Asian users included:
- China Airlines used the type on its non-stop routes from Taipei to San Francisco and Los Angeles
- CAAC (now Air China) used the type to open its first route to USA: Beijing - Seattle. Later, the type was also used for service to Vancouver and New York from Beijing.
- Korean Air operated the type on routes from Seoul to various destinations in USA.
- Aerolineas Argentinas operated one 747SP (from Braniff) on flights to Miami, Los Angeles, Toronto, Zürich and Frankfurt.
- Corsair
- Luxair Luxembourg-Nairobi-Johannesburg
- Air Mauritius
[edit] Records
There were 3 significant commercial record-setting flights flown by 747SP, two operated by Pan Am and the other operated by United Airlines with the aircraft being 'loaned' to Friendship Foundation, in order to raise money for the foundation. Those flights are:
- Liberty Bell Express—From 1 May-3 May, 1976. 2 stopovers at Indira Gandhi International Airport of New Delhi and Tokyo-Haneda Airport.
- Pan Am Flight 50—to celebrate the 50th anniversary of Pan Am. Flown October 28-30, 1977, with a time duration of 54 hours, 7 minutes, 12 seconds. 3 stopovers at London-Heathrow Airport, Cape Town International Airport and Auckland Airport.
- Friendship One—Flown in early 1988, to raise funds for Friendship Foundation. 2 stopovers at Athens Airport and Taipei-Taiwan Taoyuan International Airport, (formerly the Chiang Kai-shek International Airport). The record lasted less than a month, as it was beaten by a Gulfstream IV piloted in part by Gulfstream Aerospace CEO Al Paulson.
[edit] Incidents and accidents
- On February 19, 1985, China Airlines Flight 006, a 747SP-09 (N4522V) with 274 passengers and crew onboard on a flight from Chiang Kai-shek Airport to Los Angeles International Airport suffered an inflight failure on the no.4 engine. While the flight crew attempted to restore power the aircraft rolled to the right and started a steep descent from the cruising altitude of 41,000 feet, accelerating to 4.8 G and 5.1 G on two occasions. The captain managed to stabilize the aircraft at 9,500 feet and the aircraft diverted to San Francisco International Airport which was 550 km (343.8 mls) away. Two passengers were injured and the aircraft suffered major structural damage.[7]
[edit] Specifications (747SP)
Data from Boeing Commercial Airplanes[8] and Airliners.net[9]
General characteristics
- Crew: 3 (2 pilots, flight engineer)
- Capacity: 331 (28 first, 303 economy)
- Length: 184 ft 9 in (56.31 m)
- Wingspan: 195 ft 8 in (59.64 m)
- Height: 65 ft 10 in (20.06 m)
- Wing area: 5,500 ft² (511 m²)
- Empty weight: 336,870 lb (152,780 kg)
- Max takeoff weight: 670,000 lb (304,000 kg)
- Powerplant: 4× Pratt & Whitney JT9D-7R4W turbofan engines, 46,500 lbf (206.8 kN) each
Performance
- Maximum speed: .92 Mach (591 knots, 1,095 km/h)
- Cruise speed: .88 Mach (535 knots, 990 km/h)
- Range: 6,650 nm (7,650 mi, 12,325 km) with 276 passengers
[edit] See also
Related development
Comparable aircraft
Related lists
[edit] References
- ^ Sutter, Joe (2006). 747: Creating the world's first jumbo jet and other adventures from a life in aviation. HarperCollins, p. 218. ISBN 0-06-088241-7.
- ^ Norris, Guy (1997). Boeing 747: Design and Development Since 1969. Motorbooks International, p. 74. ISBN 0-7603-0280-4.
- ^ Boeing 747SP Website - Productionlist. 747SP.com. Retrieved on 2006-10-10.
- ^ www.747sp.com
- ^ About Qantas - Newsroom Red, White And Q Farewell For Qantas Aircraft. Qantas (2002-03-04). Retrieved on 2008-06-04.
- ^ http://www.braniffinternational.org/aircraft/747sp.htm
- ^ Aviation Safety Network report - 19 February 1985 accident
- ^ 747 Airplane Characteristics for Airport Planning. Boeing Commercial Airplanes. Retrieved on 2006-10-09.
- ^ Boeing 747SP. Airliners.net. Retrieved on 2006-10-09.
[edit] External links
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