NASA said Thursday that it will not make another attempt to launch space shuttle Discovery until at least Sunday -- and even that is a "really optimistic good-luck scenario."
Deputy shuttle program manager Wayne Hale said the space agency still probably faces several days of troubleshooting to figure out what caused the faulty fuel-gauge reading that forced the cancellation of Wednesday's launch attempt.
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NOTE: Discovery Facts
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Crew Prepares
Hale said the space agency had 12 engineering teams around the country trying to figure out the problem.
NASA engineers still weren't exactly sure why the sensor wasn't working properly, he said.
Inside the external tank, one of four sensors that measure the liquid hydrogen started giving erratic readings before launch Wednesday.
The faulty gauge reading cropped up after the tank was filled with more than 500,000 gallons of liquid hydrogen and oxygen. Launch controllers ran a test to check out all four hydrogen-fuel gauges in the tank; when they sent a command mimicking an empty tank, three indicated empty, while one stayed stuck on full.
The shuttle's eco-sensors are supposed to shut down engines if fuel runs low.
"If that were to happen during flight, it could lead to a catastrophic failure," Local 6 News reporter Donald Forbes said.
There could be several sources for the bad reading, Local 6 News reported.
"One would be the sensor itself inside the external tank and that would mean a lengthy delay," Forbes said.
"If we have to start thinking about getting inside the external tank, that is an extremely large job to do," shuttle launch manager Mike Leinbach said. "And it's one that I've said in the past that we would prefer to do in the Vehicle Assembly Building."
The problem could also be easier to fix, according to Forbes.
"There are several failure modes we could be in here which could allow a rapid turnaround," Astronaut Dave Wolf said.
Experts said an electronics box on the craft could be bad and that would only require replacing it. A bad wire is also a possibility, which would also be a quick fix.
Thursday, a technician was under shuttle Discovery to investigate the problems.
If the shuttle is forced to roll back to the Vehicle Assembly Building, the launch could be pushed back until September, Local 6 News reported.
Wednesday, thousands of people had descended on Florida's Kennedy Space Center for the launch, including families of the seven astronauts killed when Columbia disintegrated.
Similar fuel-gauge problems had cropped up during tests in April but technicians and officials thought they had been fixed.
Watch Local 6 News for more on this story.
Previous Stories: - July 13, 2005: Glitch Forces Discovery Launch Scrub
- July 12, 2005: Funnel Cloud Spotted Near KSC Landing Facility
- July 12, 2005: Family Of Israeli Astronaut Will Not Attend Shuttle Launch
- July 12, 2005: NASA Confident Discovery Will Launch On Schedule
- July 12, 2005: Astronauts Arrive At Launch Site, Beating Hurricane
- July 11, 2005: Countdown Begins For Shuttle's Return To Space
- July 10, 2005: NASA To Keep Discovery On Launch Pad
- July 9, 2005: Space Coast Looks For Economic Boost From Shuttle Launch
- July 7, 2005: Shuttle Discovery Set To Launch July 13
- July 7, 2005: NASA Monitors Terror Attacks, Hurricane As Shuttle Launch Date Nears
- July 4, 2005: 107 Cameras To Watch Shuttle Discovery's Launch
- June 30, 2005: Shuttle Discovery Facts
- June 28, 2005: NASA Chief: Shuttle Is Ready To Go
- June 13, 2005: Discovery Being Prepared To Roll To Launch Pad
- June 9, 2005: Shuttle Rollout Slips To Tuesday
- June 6, 2005: Discovery Set To Get New Fuel Tank
- June 2, 2005: NASA Fuels Shuttle For First Time In More Than 2 Years
- June 2, 2005: Astronauts Wrap Up Shuttle Test
- May 2, 2005: Astronauts Arrive AT KSC For Rehearsal
- April 29, 2005: NASA Makes Shuttle Launch Delay Official
- April 21, 2005: NASA Delays Discovery Launch Until May 22
- April 6, 2005: Despite Crack In Foam, Shuttle Rolls Toward Pad
- April 6, 2005: Shuttle May Miss Liftoff Date
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