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The Shuttle Carrier Aircraft (SCA) are two extensively modified
Boeing 747 The Boeing 747 is a long-range wide-body aircraft, wide-body airliner designed and manufactured by Boeing Commercial Airplanes in the United States between 1968 and 2023. After the introduction of the Boeing 707, 707 in October 1958, Pan Am ...
airliners that
NASA The National Aeronautics and Space Administration (NASA ) is an independent agencies of the United States government, independent agency of the federal government of the United States, US federal government responsible for the United States ...
used to transport
Space Shuttle orbiter The Space Shuttle orbiter is the spaceplane component of the Space Shuttle, a partially reusable launch system, reusable orbital spaceflight, orbital spacecraft system that was part of the discontinued Space Shuttle program. Operated from 1981 ...
s. One (N905NA) is a 747-100 model, while the other (N911NA) is a short-range 747-100SR. Both are now retired. The SCAs were used to ferry Space Shuttles from landing sites back to the
Shuttle Landing Facility The Shuttle Landing Facility (SLF), also known as Launch and Landing Facility (LLF) , is an airport located on Merritt Island, Florida, Merritt Island in Brevard County, Florida, Brevard County, Florida, United States. It is a part of the Kennedy ...
at the
Kennedy Space Center The John F. Kennedy Space Center (KSC, originally known as the NASA Launch Operations Center), located on Merritt Island, Florida, is one of the NASA, National Aeronautics and Space Administration's (NASA) ten NASA facilities#List of field c ...
. The orbiters were placed on top of the SCAs by
Mate-Demate Device The Mate-Demate Device was a specialized gantry crane designed to lift a Space Shuttle orbiter onto and off the back of a Shuttle Carrier Aircraft (SCA). Two Mate-Demate Devices were built, one at the Armstrong Flight Research Center in Californi ...
s, large
gantry A gantry is an overhead bridge-like structure supporting equipment such as a crane, signals, or cameras. Devices and structures *Gantry (medical), cylindrical scanner assembly used for medical 3D-imaging or treatment *Gantry (transport), an over ...
-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.


Design and development

The
Lockheed C-5 Galaxy The Lockheed C-5 Galaxy is a large military transport aircraft designed and built by Lockheed Corporation, Lockheed, and now maintained and upgraded by its successor, Lockheed Martin. It provides the United States Air Force (USAF) with a heavy ...
was considered for the shuttle-carrier role by NASA but rejected in favor of the 747. This was due to the 747's low-wing design in comparison to the C-5's high-wing design, and also because the U.S. Air Force would have retained ownership of the C-5, while NASA could own the 747s outright. The first aircraft, a Boeing 747-123 registered N905NA, was originally manufactured for
American Airlines American Airlines, Inc. is a major airlines of the United States, major airline in the United States headquartered in Fort Worth, Texas, within the Dallas–Fort Worth metroplex, and is the Largest airlines in the world, largest airline in the ...
. With a decline in air traffic and failure to fill their 747s, American Airlines sold it to NASA. It still wore the visible American cheatlines while testing ''Enterprise'' in the 1970s. It was acquired in 1974 and initially used for trailing wake vortex research as part of a broader study by NASA Dryden, as well as Shuttle tests involving an
F-104 The Lockheed F-104 Starfighter is an American single-engine, supersonic Interceptor aircraft, interceptor. Created as a day fighter by Lockheed Corporation, Lockheed as one of the "Century Series" of fighter aircraft for the United States Air ...
flying in close formation and simulating a release from the 747. The aircraft was extensively modified for NASA by Boeing in 1976. While first-class seats were kept for NASA passengers, its main cabin and insulation were stripped, 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. 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 Avionics (a portmanteau of ''aviation'' and ''electronics'') are the Electronics, electronic systems used on aircraft. Avionic systems include communications, Air navigation, navigation, the display and management of multiple systems, and the ...
and engines were also upgraded. An internal escape slide was added behind the flight deck 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. Flying with the additional drag and weight of the Orbiter imposed significant fuel and altitude penalties. The range was reduced to , compared to an unladen range of , requiring an SCA to stop several times to refuel on a transcontinental flight.. Without the Orbiter, the SCA needed to carry
ballast Ballast is dense material used as a weight to provide stability to a vehicle or structure. Ballast, other than cargo, may be placed in a vehicle, often a ship or the gondola of a balloon or airship, to provide stability. A compartment within ...
to balance its center of gravity. The SCA had an altitude ceiling of and a maximum cruise speed of Mach 0.6 with the orbiter attached. A crew of 170 took a week to prepare the shuttle and SCA for flight. Studies were conducted to equip the SCA with
aerial refueling Aerial refueling ( en-us), or aerial refuelling ( en-gb), also referred to as air refueling, in-flight refueling (IFR), air-to-air refueling (AAR), and tanking, is the process of transferring aviation fuel from one aircraft (the tanker) to an ...
equipment, a modification already made to the U.S. Air Force E-4 (modified 747-200s) and 747 tanker transports for the IIAF. However, during formation flying with a tanker aircraft to test refueling approaches, minor cracks were spotted on the tailfin of N905NA. While these were not likely to have been caused by the test flights, it was felt that there was no sense taking unnecessary risks. Since there was no urgent need to provide an aerial refueling capacity, the tests were suspended.By 1983, SCA N905NA no longer carried the distinct American Airlines tricolor cheatline. NASA replaced it with its own livery, consisting of a white fuselage and a single blue cheatline. That year, after secretly being fitted with an
infrared countermeasure An infrared countermeasure (IRCM) is a device designed to protect aircraft from infrared homing ("heat seeking") missiles by confusing the missiles' infrared guidance system so that they miss their target (electronic countermeasure). Heat-see ...
s system to protect it from
heat-seeking missile Infrared homing is a passive weapon guidance system which uses the infrared (IR) light emission from a target to track and follow it seamlessly. Missiles which use infrared seeking are often referred to as "heat-seekers" since infrared is r ...
s, it was also used to fly ''Enterprise'' on a tour in Europe, with refueling stops in Goose Bay, Canada; Keflavik, Iceland; England; and West Germany. It then went to the
Paris Air Show The Paris Air Show (, ''Salon du Bourget'') is a trade fair and air show held in odd years at Paris–Le Bourget Airport in France. Organized by the French aerospace industry's primary representative body, the ''Groupement des industries frança ...
. In 1988, in the wake of the ''Challenger'' accident, NASA procured a surplus 747SR-46 from
Japan Airlines Japan Airlines (JAL) is the flag carrier airline of Japan. JAL is headquartered in Shinagawa, Tokyo. Its main hubs are Tokyo's Narita International Airport, Narita and Haneda Airport, Haneda airports, as well as secondary hubs in Osaka's Kansai ...
. 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 Palmdale is a city in northern Los Angeles County, California, United States. The city lies in the Antelope Valley of Southern California. The San Gabriel Mountains separate Palmdale from the Los Angeles Basin to the south. On August 24, 1962 ...
to
Kennedy Space Center The John F. Kennedy Space Center (KSC, originally known as the NASA Launch Operations Center), located on Merritt Island, Florida, is one of the NASA, National Aeronautics and Space Administration's (NASA) ten NASA facilities#List of field c ...
. Based at the
Dryden Flight Research Center The NASA Neil A. Armstrong Flight Research Center (AFRC) is an aeronautical research center operated by NASA. Its primary campus is located inside Edwards Air Force Base in California and is considered NASA's premier site for aeronautical rese ...
within
Edwards Air Force Base Edwards Air Force Base (AFB) is a United States Air Force installation in California. Most of the base sits in Kern County, California, Kern County, but its eastern end is in San Bernardino County, California, San Bernardino County and a souther ...
in California 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". 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.
Boeing The Boeing Company, or simply Boeing (), is an American multinational corporation that designs, manufactures, and sells airplanes, rotorcraft, rockets, satellites, and missiles worldwide. The company also provides leasing and product support s ...
transported its Phantom Ray
unmanned combat aerial vehicle An unmanned combat aerial vehicle (UCAV), also known as a combat drone, fighter drone or battlefield UAV, is an unmanned aerial vehicle (UAV) that is used for intelligence, surveillance, target acquisition, and reconnaissance and carries aircra ...
(UCAV) demonstrator from St. Louis, Missouri, to Edwards on a Shuttle Carrier Aircraft on December 11, 2010.


Approach and Landing Tests

The
Approach and Landing Tests The Approach and Landing Tests were a series of sixteen taxiing, taxi and flight trials of the prototype Space Shuttle Orbiter, Space Shuttle ''Space Shuttle Enterprise, Enterprise'' that took place between February and October 1977 to test the ...
were a series of taxi and flight trials of the prototype Space Shuttle ''Enterprise'', conducted at
Edwards Air Force Base Edwards Air Force Base (AFB) is a United States Air Force installation in California. Most of the base sits in Kern County, California, Kern County, but its eastern end is in San Bernardino County, California, San Bernardino County and a souther ...
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 three taxi tests, eight captive flight tests and five free flight tests where the ''Enterprise'' was released from the SCA during flight and glided to a landing under its own control.


Ferry flights

During the decades of Shuttle operations, the SCAs were most often used to transport the orbiters from
Edwards Air Force Base Edwards Air Force Base (AFB) is a United States Air Force installation in California. Most of the base sits in Kern County, California, Kern County, but its eastern end is in San Bernardino County, California, San Bernardino County and a souther ...
, the shuttle's secondary landing site, to the
Shuttle Landing Facility The Shuttle Landing Facility (SLF), also known as Launch and Landing Facility (LLF) , is an airport located on Merritt Island, Florida, Merritt Island in Brevard County, Florida, Brevard County, Florida, United States. It is a part of the Kennedy ...
(SLF) at the
Kennedy Space Center The John F. Kennedy Space Center (KSC, originally known as the NASA Launch Operations Center), located on Merritt Island, Florida, is one of the NASA, National Aeronautics and Space Administration's (NASA) ten NASA facilities#List of field c ...
where the orbiter was processed for another launch. The SCAs were also used to transport the orbiters between manufacturer
Rockwell International Rockwell International was a major American manufacturing conglomerate (company), conglomerate. It was involved in aircraft, the space industry, defense and commercial electronics, components in the automotive industry, printing presses, avioni ...
and NASA during initial delivery and mid-life refits. 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
Udvar-Hazy Center The Steven F. Udvar-Hazy Center, also called the Udvar-Hazy Center, is the Smithsonian Institution, Smithsonian National Air and Space Museum (NASM)'s annex at Dulles International Airport in the Chantilly, Virginia, Chantilly area of Fairfax C ...
of the
Smithsonian Institution The Smithsonian Institution ( ), or simply the Smithsonian, is a group of museums, Education center, education and Research institute, research centers, created by the Federal government of the United States, U.S. government "for the increase a ...
's
National Air and Space Museum The National Air and Space Museum (NASM) of the Smithsonian Institution is a museum in Washington, D.C., in the United States, dedicated to history of aviation, human flight and space exploration. Established in 1946 as the National Air Museum, ...
at the
Dulles International Airport Washington Dulles International Airport ( ) – commonly known by its former name of Dulles International Airport, by its airport code of IAD, or simply as Dulles Airport – is an international airport in the Eastern United States, located w ...
on April 17, 2012, making low-level passes over Washington, D.C. landmarks before landing. ''Enterprise'', which had been on display at the Smithsonian was transported to the
Intrepid Sea, Air & Space Museum The ''Intrepid'' Museum (originally the ''Intrepid'' Sea, Air & Space Museum) is a military and maritime history museum in New York City, United States. It is located at Pier 86 at 46th Street (Manhattan), 46th Street, along the Hudson River, ...
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 John F. Kennedy International Airport is a major international airport serving New York City and its metropolitan area. JFK Airport is located on the southwestern shore of Long Island, in Queens, New York City, bordering Jamaica Bay. It is ...
, where it was transferred by barge to the museum. The last ferry flight took ''Endeavour'' from Kennedy Space Center to Los Angeles between September 19 and 21, 2012 with refueling stops at
Ellington Field Ellington Field Joint Reserve Base is a joint installation shared by various active component and reserve component military units, as well as aircraft flight operations of the National Aeronautics and Space Administration (NASA) under the aegi ...
and Edwards Air Force Base. After leaving Edwards the SCA with ''Endeavour'' performed low level flyovers above various landmarks across California, from
Sacramento Sacramento ( or ; ; ) is the capital city of the U.S. state of California and the seat of Sacramento County. Located at the confluence of the Sacramento and American Rivers in Northern California's Sacramento Valley, Sacramento's 2020 p ...
to the San Francisco Bay Area, before finally being delivered to
Los Angeles International Airport Los Angeles International Airport is the primary international airport serving Los Angeles and its Greater Los Angeles, surrounding metropolitan area, in the U.S. state of California. LAX is located in the Westchester, Los Angeles, Westcheste ...
(LAX). From there the orbiter was transported through the streets of Los Angeles and Inglewood to its final destination, the
California Science Center The California Science Center (sometimes spelled California ScienCenter) is a state agency and science museum located in Exposition Park, Los Angeles, next to the Natural History Museum of Los Angeles County and the University of Southern Cali ...
in Exposition Park.


Retirement

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 The Stratospheric Observatory For Infrared Astronomy (SOFIA) was an 80/20 joint project of NASA and the German Aerospace Center (DLR) to construct and maintain an airborne observatory. NASA awarded the contract for the development of the aircra ...
(SOFIA) aircraft, another modified Boeing 747. 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. 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, but when NASA engineers surveyed N905NA they determined that it had few parts usable for SOFIA. In 2013, a decision was made to preserve N905NA and display it at
Space Center Houston Space Center Houston is a science museum that serves as the official visitor center of NASA Johnson Space Center in Houston, Texas. It was designated a Smithsonian Affiliate museum in 2014. The organization is owned by NASA, and operated unde ...
with the mockup Space Shuttle ''Independence'' mounted on its back. N905NA was flown to
Ellington Field Ellington Field Joint Reserve Base is a joint installation shared by various active component and reserve component military units, as well as aircraft flight operations of the National Aeronautics and Space Administration (NASA) under the aegi ...
where it was carefully dismantled, ferried to the
Johnson Space Center The Lyndon B. Johnson Space Center (JSC) is NASA's center for human spaceflight in Houston, Texas (originally named the Manned Spacecraft Center), where human spaceflight training, research, and flight controller, flight control are conducted. ...
in seven major pieces (a process called The Big Move), reassembled, and finally mated with the replica shuttle in August 2014. The display, called Independence Plaza, opened to the public for the first time on January 23, 2016.


Specifications


See also


References


Further reading

*


External links


NASA fact sheet

Interview with SCA Pilot and Former Astronaut Gordon Fullerton

Interview with SCA Crew Chief Pete Seidl
* * {{Space Shuttle Enterprise 1970s United States special-purpose aircraft Space Shuttle program Quadjets NASA aircraft Boeing 747 Articles containing video clips Aircraft related to spaceflight Historic American Engineering Record in Texas