The porch outside the Japanese Kibo module will expose scientific experiments to the extremities of space and is the main objective of the shuttle flight, which will bring the final pieces of Kibo to ISS when it launches on Saturday.
The Endeavour is set to take off at 07:17 (1117 GMT) from the Kennedy Space Centre in Florida and dock with the ISS on Monday.
The launch comes at a busy time for Nasa, just weeks after a shuttle flight to repair the Hubble Space Telescope and days before a rocket launch on June 17 to study the moon for the possible return of manned exploration.
The US space agency is also working to fit in seven further flights of the shuttle before scrapping the ageing craft in late 2010.
The shuttle will also bring a new resident to the ISS crew. US astronaut Tim Kopra will replace Japanese astronaut Koichi Wakata on the recently expanded six-person crew.
Japanese Experiment Module-Exposed Facility
Five spacewalks are planned for the 17-day mission with the installation of new space station components and the delivery of spare parts, which will help keep the station running after the shuttle programme is retired next year.
The 4 082-kilogramme porch, known as the Japanese Experiment Module-Exposed Facility, will be installed in the first spacewalk. Astronauts Dave Wolf and Kopra will prepare the outside of the Kibo module for the addition.
Astronauts Mark Polansky and Canadian Julie Payette will use the shuttle's robotic arm to remove the piece from the shuttle and hand it off to the station's arm, operated by Doug Hurley and Wakata, for installation.
Endeavour is also bringing up an unpressurised storage area called the Experiment Logistics Module that will be attached to the station and house the Japanese experiments.
The robotic arms on both craft will get a workout during the mission, moving the module from the shuttle to the station. Also a Japanese-built arm will be used for its first work.
Later in the mission, the robotic arm will transfer the scientific experiments and a communications device to the porch.
X-ray camera
The experimental equipment includes an X-ray camera to look at objects in space and a device to measure neutrons, plasma, high-energy light particles, cosmic dust and other particles in space.
During the second spacewalk, astronauts will transfer spare equipment from a cargo carrier to a stowage area on the station's truss, where they can be easily retrieved on future spacewalks.
The new equipment includes an antenna, a pump mechanism and a rail mechanism. They will serve as backup parts for the ISS crew after the space shuttle programme is retired and no longer able to deliver new parts to the station.
Other spacewalks will focus on changing batteries on one of the station's solar wings and installing cameras on the outside of the craft.
After undocking from the ISS on June 26, the Endeavour will deploy two satellites. Endeavour is set to return to Earth on June 29.
- SAPA
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