CAPE CANAVERAL, FL - The seven astronauts slated to
liftoff aboard NASA's first space shuttle to fly in more than two years
aborted the mock launch of their Discovery orbiter Wednesday, evacuating the vehicle
during a dress rehearsal of the final hours before liftoff.
With just four
seconds left in their simulated countdown, the astronauts and launch
controllers for NASA's STS-114 mission halted the launch after computers
detected a main engine cutoff in the orbiter's engines. The astronauts then
exited the shuttle and rehearsed procedures to ride slide wire baskets away
from their launch site at Pad 39B here at NASA's Kennedy Space Center (KSC).
"We had a
very good test today," said Eileen Collins, STS-114 mission commander, during a
post-test briefing. "It felt to me like a real launch date."
Collins, a
three-spaceflight veteran, and her STS-114 crew are currently scheduled to
launch toward the International Space Station (ISS) no earlier than July 13.
The flight is NASA's first shuttle mission to fly since the 2003 Columbia disaster that led
to the loss of that orbiter and its STS-107 crew.
NASA had previously
targeted a launch window opening on May 22 for Discovery, before pushing to
July to allow more time for external tank checks, ice debris evaluation and
contaminated thermal blankets on the orbiter. It was launch debris - a suitcase-sized
chunk of external tank insulation - that damaged to Columbia's left wing, allowing hot gases to
seep in during reentry and ultimately destroy the orbiter, investigators found.
But Discovery's
launch delay will come in handy for the shuttle's crew, the astronauts said.
"It helps
keep us moving and by working ahead [and] helps us point
out our weak areas," Collins said, adding that she and her crew are committed
to launch. "Yes we have had a delay...we will fly."
A test run
Under
cloudy skies, the STS-114 astronauts walked out of their crew quarters in
orange flight suits and boarded the AstroVan bus that would carry them to
Launch Pad 39B, where Discovery and its propulsion stack currently sits.
The launch
rehearsal, a standard activity that precedes every shuttle launch, is called a
Terminal Countdown Demonstration Test (TCDT).
"We never
did the TCDT for our original launch," said Collins, adding that the STS-114
mission was originally set to launch in March 2003 but was rescheduled
following the Columbia accident. "We stopped training."
While
Discovery's crew reported to the launch pad at about 7:45 a.m. EDT (1145 GMT),
the simulated countdown actually began a day earlier - at 8:00 a.m. EDT (1200
GMT) May 3 - for the mission's launch team.
"The
thought did go through my mind today that the last crew that strapped in at the
launch pad was the STS-107 crew," Collins said. "So we were very focused coming
out of this test to make sure that every little detail is being considered."
The first
significant glitch occurred at about 8:52 a.m. EDT (1252 GMT), when launch
controllers were unable to communicate with Discovery's mid-deck crew. After
replacing a communications box and resetting a switch, the problem was solved.
The poor
weather, however, persisted and would have ultimately violated shuttle flight
rules on launch day, NASA officials said. A second communication problem, this
one between launch controllers and the Eastern Range
that tracks the shuttle after liftoff also persisted, and would also have posed
a dilemma.
"We're not
going to troubleshoot the range problem any more today, but on launch day that
would be an issue because it is a requirement for launch," said NASA spokesman
George Diller, who provided mission commentary during the mock launch attempt.
Wednesday's
launch abort test capped four days of flight procedure and emergency training
for the STS-114 crew, which the astronauts said was a motivating experience as
they worked toward a July launch.
"We're
going to get the shuttle flying, we'll get the International Space Station
built and onto our exploration agenda," Collins said. "This is a very short
delay in the big picture and we need to do it right."
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