Inspectors find fourth crack in Discovery space shuttle
If not repaired in time, cracks could delay launch until February 2011.
Tue, Nov 16 2010 at 1:43 AM
ANOTHER DELAY: The new crack was found while technicians were removing foam while inspecting the support beams. (Photo: ZUMA Press)
WASHINGTON — Inspectors have found a fourth crack in support beams on the external fuel tanks of the space shuttle Discovery after the final flight of the shuttle was delayed because of a hydrogen leak, NASA said.
The latest crack was found while technicians were removing foam while inspecting the support beams, which are called stringers, in the aftermath of the hydrogen leak, the space agency said late on Monday.
Two nine-inch (21-centimeter) cracks were found in an adjacent support beam on Friday, and a three-inch (7.5 centimeter) fissure was uncovered over the weekend.
"Further foam removal revealed one additional corresponding crack on the same left-hand adjacent stringer," NASA said.
"Technicians plan to remove that section of the stringer Monday night. They'll also install a new section of metal, called a doubler because it?s twice as thick as the original stringer metal, on the stringer that had the nine-inch cracks," it said.
Stringers are 21-foot (6.4-meter) long support beams in an area between the lower part of the external fuel tanks, which holds liquid hydrogen, and the upper part containing liquid oxygen.
The space agency is still aiming to launch Discovery at the next opportunity Nov. 30, but senior managers will meet at the Johnson Space Center Nov. 22 to review the repair work and launch preparations.
To get in a flight to the International Space Station this year, Discovery must blast off before Dec. 6. Otherwise it will have to wait until February, the same month that the last-ever shuttle launch is scheduled before the fleet is mothballed for good.
Discovery's 11-day mission with its all-American crew of six is to deliver a pressurized logistics module called Leonardo to the ISS, which will be permanently attached to the space station to provide more storage space.
The shuttle will also bring Robonaut 2, the first human-like robot in space and a permanent addition to the orbiting space station, as well as spare parts.
Two space walks, for maintenance work and component installation, are scheduled.
The Discovery has launched into space 38 times, and NASA aims to retire the shuttle after its final and 39th voyage.
Copyright 2010 AFP American Edition
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