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Sunday Shuttle Launch Possible But Not Likely

12 Engineering Teams Checking Problem

POSTED: Thursday, July 14, 2005
UPDATED: 5:56 pm EDT July 14, 2005

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."

  • NASA said Friday it would not try to launch the space shuttle Discovery until late next week -- at the earliest.

    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.


    SPECIAL SECTION: Return To Flight
    INTERACTIVE:All About Space Shuttles
    IMAGES: Meet Crew | Heads To Pad
    NOTE: Discovery Facts
    VIDEO: Scrubbed | Remembering Columbia
    VIDEO: Crew To Shuttle | 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.

    Video

    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.

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