Shuttle Carrier Aircraft

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Shuttle Carrier Aircraft
NASA's Shuttle Carrier Aircraft 905 (front) and 911 (back)
Role
freight aircraft
Manufacturer Boeing
First flight 18 February 1977
Introduction 1977
Retired 2012
Status Retired, both aircraft preserved
Primary users NASA
Boeing
Number built 2
Developed from
Boeing 747-100

The Shuttle Carrier Aircraft (SCA) are two retired extensively modified Boeing 747 airliners that NASA used to transport Space Shuttle orbiters. One (N905NA) is a 747-100 model, while the other (N911NA) is a short-range 747-100SR.

The SCAs were used to ferry Space Shuttles from landing sites back to the Shuttle Landing Facility at the Kennedy Space Center. The orbiters were placed on top of the SCAs by Mate-Demate Devices, large gantry-like structures that hoisted the orbiters off the ground for post-flight servicing then mated them with the SCAs for ferry flights.

In

approach and landing test flights conducted in 1977, the test shuttle Enterprise was released from an SCA during flight and glided to a landing under its own control.[1]

Design and development

The

U.S. Air Force
would have retained ownership of the C-5, while NASA could own the 747s outright.

Shuttle Carrier Aircraft N905NA, still in American Airlines livery, with Enterprise in 1978

The first aircraft, a Boeing 747-123 registered N905NA, was originally manufactured for

F-104
flying in close formation and simulating a release from the 747.

The aircraft was extensively modified for NASA by Boeing in 1976.[2] While first-class seats were kept for NASA passengers, its main cabin and insulation were stripped,[3] and the fuselage was strengthened. Mounting struts were added on top of the 747, located to match the fittings on the Shuttle that attach it to the external fuel tank for launch.[4] With the Shuttle riding on top, the center of gravity was altered. Vertical stabilizers were added to the tail to improve stability when the Orbiter was being carried. The avionics and engines were also upgraded.

An internal escape slide was added behind the flight deck[5] in case of catastrophic failure mid-flight. In the event of a bail-out, explosives would be detonated to make an opening in the fuselage at the bottom of the slide, allowing the crew to exit through the slide and parachute to the ground. The slide system was removed following the Approach and Landing Tests because of concerns over the possibility of escaping crew members being ingested into an engine.[6]

Flying with the additional drag and weight of the Orbiter imposed significant fuel and altitude penalties. The range was reduced to 1,000 nautical miles (1,900 km; 1,200 mi), compared to an unladen range of 5,500 nautical miles (10,200 km; 6,300 mi), requiring an SCA to stop several times to refuel on a transcontinental flight.[7] Without the Orbiter, the SCA needed to carry ballast to balance its center of gravity.[3] The SCA had an altitude ceiling of 15,000 feet (4,600 m) and a maximum cruise speed of Mach 0.6 with the orbiter attached.[7] A crew of 170 took a week to prepare the shuttle and SCA for flight.[8]


Studies were conducted to equip the SCA with

Keflavik, Iceland; England; and West Germany. It then went to the Paris Air Show.[8]

Shuttle Carrier Aircraft N911NA, shortly after purchase, with newly built shuttle Endeavour in 1991.

In 1988, in the wake of the Challenger accident, NASA procured a surplus 747SR-46 from Japan Airlines. Registered N911NA, it entered service with NASA in 1990 after undergoing modifications similar to N905NA. It was first used in 1991 to ferry the new shuttle Endeavour from the manufacturers in Palmdale, California to Kennedy Space Center.

Humorous note on mount reminding technicians how to connect the orbiter to the SCA

Based at the

Dryden Flight Research Center within Edwards Air Force Base in California[3]
the two aircraft were functionally identical, although N911NA has five upper-deck windows on each side, while N905NA has only two.

The rear mounting points on both aircraft were labeled with humorous instructions to "attach orbiter here" or "place orbiter here", clarified by the precautionary note "black side down".[11][12]

Shuttle Carriers were capable of operating from alternative shuttle landing sites such as those in the United Kingdom, Spain, and France. Because Shuttle Carrier's range is reduced while mated to an orbiter, additional preparations such as removal of the payload from the orbiter may have been necessary to reduce its weight.[13]

Boeing transported its Phantom Ray unmanned combat aerial vehicle (UCAV) demonstrator from St. Louis, Missouri, to Edwards on a Shuttle Carrier Aircraft on December 11, 2010.[14]

Approach and Landing Tests

Space Shuttle Enterprise detaches from Shuttle Carrier Aircraft N905NA during ALT-13

The Approach and Landing Tests were a series of taxi and flight trials of the prototype Space Shuttle Enterprise, conducted at Edwards Air Force Base in 1977. They verified the shuttle's flight characteristics when mated to the Shuttle Carrier Aircraft and when flying on its own, prior to the Shuttle system becoming operational. There were 3 taxi tests, 8 captive flight tests and 5 free flight tests.[5]

Ferry flights

Atlantis being mated to Shuttle Carrier Aircraft N911NA at using the Mate-Demate Device

During the decades of Shuttle operations, the SCAs were most often used to transport the orbiters from Edwards Air Force Base, the shuttle's secondary landing site, to the Shuttle Landing Facility (SLF) at the Kennedy Space Center where the orbiter was processed for another launch. The SCAs were also used to transport the orbiters between manufacturer Rockwell International and NASA during initial delivery and mid-life refits.[15]

At the end of the Space Shuttle program the SCA was used to deliver the retired orbiters from the Kennedy Space Center to their museums.

Discovery was flown to the

Intrepid Sea, Air & Space Museum in New York City on April 27, 2012, making low-level passes over the city's landmarks, before landing at John F. Kennedy International Airport
, where it was transferred by barge to the museum.

The last ferry flight took

Exposition Park
.

Retirement

N911NA sits on display at the Joe Davies Heritage Airpark in Palmdale, California, in June 2015

Shuttle Carrier N911NA was retired on February 8, 2012, after its final mission to the Dryden Flight Research Facility at Edwards Air Force Base in Palmdale, California, and was used as a source of parts for NASA's Stratospheric Observatory for Infrared Astronomy (SOFIA) aircraft, another modified Boeing 747.[16] N911NA is now preserved and on display at the Joe Davies Heritage Airpark in Palmdale, California as part of a long-term loan to the city from NASA.[17][18]

N905NA on display with mockup Space Shuttle Independence at Space Center Houston

Shuttle Carrier N905NA was used to ferry the retired Space Shuttles to their respective museums. After delivering Endeavour to the Los Angeles International Airport in September 2012, the aircraft was flown to the Dryden Flight Research Facility, where NASA intended it to join N911NA as a source of spare parts for NASA's SOFIA aircraft,

Ellington Field where it was carefully dismantled, ferried to the Johnson Space Center in seven major pieces (a process called The Big Move), reassembled, and finally mated with the replica shuttle in August 2014.[21] The display, called Independence Plaza, opened to the public for the first time on January 23, 2016.[22]

Specifications

SCA 3-view schematic
SCA 3-view schematic

Data from Boeing 747-100 specifications[23] Jenkins 2000[7]

General characteristics

  • Crew: Four: two pilots, two flight engineers (one flight engineer when not carrying Shuttle)
  • Capacity: 108,999.6 kg (240,303 lb) payload (external Shuttle Orbiter Cargo)
  • Length: 231 ft 4 in (70.51 m)
  • Wingspan: 195 ft 8 in (59.64 m)
  • Height: 63 ft 5 in (19.33 m)
  • Wing area: 5,500 sq ft (510 m2)
  • Empty weight: 318,000 lb (144,242 kg)
  • Max takeoff weight: 710,000 lb (322,051 kg)
  • Powerplant: 4 ×
    Pratt & Whitney JT9D-7J turbofan
    engines, 50,000 lbf (220 kN) thrust each

Performance

  • Cruise speed: 250 kn (290 mph, 460 km/h) / M0.6 with Shuttle Orbiter loaded
  • Range: 1,150 nmi (1,320 mi, 2,130 km) with Shuttle Orbiter loaded
  • Service ceiling: 15,000 ft (4,600 m) with Shuttle Orbiter loaded

See also

  • Airborne aircraft carrier – Type of mother ship aircraft which can carry, launch, retrieve and support other smaller aircraft

Aircraft of comparable role, configuration, and era

Related lists

References

  1. ^ NASA Dryden Flight Research Center (1977). "Shuttle Enterprise Free Flight". National Aeronautics and Space Administration. ECN-8607. Archived from the original on March 7, 2013. Retrieved November 28, 2007.
  2. .
  3. ^ a b c Brack, Jon (September 17, 2012). "Inside the Space Shuttle Carrier Aircraft". National Geographic. Retrieved September 17, 2012.
  4. ^ How was Enterprise Held and Released from the Carrier 747
  5. ^ a b Approach and Landing Test Evaluation Team (February 1978). Space Shuttle Orbiter Approach and Landing Test: Final Evaluation Report (PDF). Houston: National Aeronautics and Space Administration Lyndon B. Johnson Space Center. Retrieved April 21, 2020.
  6. ^ Creech, Gray (August 22, 2003). "Gravel Haulers: NASA's 747 Shuttle Carriers" (Press release). National Aeronautics and Space Administration. Retrieved April 20, 2020.
  7. ^ a b c Jenkins (2000), pp. 38–39.
  8. ^ a b Gilette, Felix (August 9, 2005). "How the Space Shuttle Flies Home". Slate. Retrieved June 1, 2019.
  9. ^ Comparison of photos taken in 1982 and 1983 at Airliners.net
  10. ^ Rogoway, Joseph Trevithick and Tyler (January 27, 2022). "Space Shuttle Carrying 747 Was Secretly Modified To Defend Itself From Heat-Seeking Missiles (Updated)". The Drive. Retrieved January 29, 2022.
  11. ^ 2003 Edwards Air Force Base Air Show, see Shuttle Carrier images.
  12. ^ Shuttle Carrier Aircraft N911NA album on Photobucket
  13. ^ "Space Shuttle Transoceanic Abort Landing (TAL) Sites" (PDF). National Aeronautics and Space Administration. December 2006. Retrieved July 1, 2009.
  14. ^ Boeing Phantom Ray to catch shuttle ride at Lambert
  15. ^ "STS Chronology". National Aeronautics and Space Administration.
  16. ^ a b NASA's Shuttle Carrier Aircraft 911's Final Flight
  17. ^ Gibbs, Yvonne (September 12, 2014). "Final Journey: SCA 911 on Display at Davies Airpark" (Press release). National Aeronautics and Space Administration. Retrieved June 15, 2018.
  18. ^ Gibbs, Yvonne (September 24, 2014). "NASA Armstrong Fact Sheet: Shuttle Carrier Aircraft". National Aeronautics and Space Administration. Retrieved June 15, 2018.
  19. ^ Landis, Tony. "A graphic history of 35 years of Space Shuttle ferry flights now adorns the upper forward fuselage of NASA Shuttle Carrier Aircraft 905". National Aeronautics and Space Administration.
  20. ^ "Houston's Shuttle Gets New Name, Familiar Ride". Spaceflight Insider. October 8, 2013.
  21. ^ Hays, Brooks (August 14, 2014). "Shuttle replica lifted and put on top of 747 carrier". SpaceDaily. United Press International.
  22. ^ Cofield, Calla (January 29, 2016). "Seeing Is Believing: Enormous Shuttle Program Artifact Inspires Wonder". Space.com. Retrieved December 20, 2022.
  23. ^ Boeing 747-100 Technical Specifications, Boeing

Further reading

  • Jenkins, Dennis R. (2001). Space Shuttle: The History of the National Space Transportation System, The First 100 Missions (3rd ed.). Midland Publishing. .

External links