Technicians are documenting the installation of radius blocks to Discovery's external fuel tank's support beams known as stringers near the intertank's thrust panel area.

In the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida, technicians are documenting the installation of radius blocks to space shuttle Discovery's external fuel tank's support beams known as "stringers" near the intertank’s thrust panel area.

The thrust panel is where the tank meets the two solid rocket boosters and sees the most stress during the flight into orbit. After the modifications and additional scans of the stringers are complete, foam insulation will be re-applied. Discovery's next launch opportunity to the International Space Station on the STS-133 mission is targeted for liftoff Feb. 24. For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Jack Pfaller