Last Shuttle External Tank Rollout at Michoud Assembly Facility

Commemorating 37 years of successful tank deliveries, NASA and Lockheed Martin Space Systems Company will hold a ceremony on Thursday, July 8, at the agency’s Michoud Assembly Facility in New Orleans to rollout the final external tank for the last space shuttle flight.

The last external tank scheduled to fly on a shuttle mission was completed on June 25 by Lockheed Martin workers at Michoud. The tank, designated ET-138, will travel on a wheeled transporter one mile to the Michoud barge dock. It will be accompanied by the Storyville Stompers, a traditional area brass band, and hundreds of handkerchief-waving employees in typical New Orleans fashion and spirit during the ceremony. ET-138 will then travel on a 900-mile sea journey to NASA’s Kennedy Space Center in Florida, where it will support shuttle Endeavour’s STS-134 launch.

The external tank, the “gas tank” for the orbiter, holds the propellants used by the space shuttle main engines. It also is the “backbone” of the shuttle during launch, providing structural support for attachment with the solid rocket boosters and orbiter. It is the only component of the space shuttle that is not reused. Approximately 8.5 minutes into the flight, with its propellant used, the tank is jettisoned into the ocean.

External tank ET-138

Taller than a 15-story building and more than 27 feet in diameter, the external tank absorbs the 7.8 million pounds of thrust of the three space shuttle main engines and solid rocket boosters during a space shuttle launch. It feeds 145,000 gallons of liquid oxygen and 390,000 gallons of liquid hydrogen to the main engines.

Space Shuttle Endeavour launches into an early morning sky at  NASA's Kennedy Space Center.

External tank ET-138 (top) will help launch Space shuttle Endeavour (bottom) into space on its last mission later this year. (Image credit: NASA)

The three main components of the external tank include the liquid oxygen tank, liquid hydrogen tank and the collar-like intertank, which connects the two propellant tanks. The intertank houses instrumentation and processing equipment and provides the attachment structure for the solid rocket boosters.

When ET-138 arrives at Kennedy, processing will begin to mate it with shuttle Endeavour and solid rocket boosters for the STS-134 mission, scheduled to launch no earlier than mid-November. The mission will deliver the Express Logistics Carrier 3 and the Alpha Magnetic Spectrometer to the International Space Station. It will be the 36th shuttle mission to the space station and the 134th and final scheduled shuttle flight.

Michoud Space Systems workers, of Lockheed Martin Corporation, Littleton, Colo., have delivered 135 flight tanks to NASA during the 25 years of flying the space shuttle.

Work will be completed on one additional external tank, ET-122, which was at Michoud during Hurricane Katrina in August 2005 and damaged by falling debris. It is being restored to flight configuration and is scheduled for delivery to Kennedy in late September to serve as the “Launch on Need” tank, if needed, for STS-134.

NASA Issues Broad Agency Announcement For Heavy Lift Studies

WASHINGTON — NASA has issued a Broad Agency Announcement (BAA) seeking proposals and industry input on heavy-lift system concepts and propulsion technology.

NASA is seeking an innovative path for human space exploration that strengthens its capability to extend human and robotic presence throughout the solar system. The information also may help lay the groundwork for humans to safely reach multiple potential destinations, including asteroids, Lagrange points, the moon and Mars.

The total funding available under this announcement is approximately $8 million; maximum individual contract award is $625,000. The deadline for submitting proposals is July 29, 2010.

Submissions should include assessments of a variety of heavy-lift launch craft and in-space vehicle architectures using various propulsion combinations. The submissions also should explain how the architectures can be employed to meet mission objectives. Proposals should capture potential system architectures and identify technology gaps, including propellant tanks, main propulsion elements and rocket health management.

A variety of in-space architectural elements may be included, such as propellant depots, and space transfer stages and vehicles. The focus will be on developing affordable system concepts that may be used by multiple entities, such as the Department of Defense, commercial corporations and international space agencies.

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