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Technical trouble scrubs Delta 4-Heavy rocket launch BY JUSTIN RAY SPACEFLIGHT NOW Posted: December 11, 2004 Today's maiden flight of the Boeing Delta 4-Heavy rocket was scrubbed because of trouble with the master sequencer that controls the crucial final seconds of the countdown.
A 7-person troubleshooting crew was dispatched to the pad's telemetry room as officials hoped to resolve the problem. Loading of the rocket with super-cold liquid hydrogen and liquid oxygen was put on hold while the team worked at the pad. After spending a couple of hours assessing the problem, the decision was made to postpone the mission until Sunday. "At this time we would like to proceed with a scrub to today's operation," the Boeing launch director told the chief launch conductor. "The main activity for the rest of the day, of course, will be to address the problem at hand." High-altitude winds and gusty surface winds were concerns during today's countdown, too. Assuming the sequencer issue can fixed by Sunday, countdown clocks will start early tomorrow morning for a fresh launch attempt. Liftoff will be possible between 2:32 to 5:28 p.m. EST (1932-2228 GMT). Air Force meteorologists predict an 80 percent chance of good weather during the window with just some scattered clouds at 4,000 feet with 3/8ths sky coverage and tops at 6,000 feet, visibility of 10 miles, northwesterly winds from 300 degrees at 10 gusting to 15 knots and a temperature of 64 degrees F. "The upper-level trough over Florida today will move eastward off the coast tomorrow resulting in a decrease in winds both at the surface and at the upper levels. Cloud cover will also continue to decrease through Sunday. A slight concern remains for a violation of ground winds," the Air Force weather team reports. This inaugural Delta 4-Heavy rocket launch will loft an instrumented satellite mockup into geosynchronous orbit during a six-hour mission designed to demonstrate the complex booster operates correctly before two national security payloads are flown next year.
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