Posted on 03/30/2003 10:07:50 PM PST by MediaMole
CAPE CANAVERAL, Fla. (AP) -- Columbia's salvaged data recorder registered unusual temperature spikes in the left wing just seconds after the shuttle experienced the peak heat of re-entry, indicating the ship was mortally wounded before it began its descent, an official close to the investigation said Sunday.
And that makes the flyaway foam from the shuttle's fuel tank, during launch, an even stronger suspect for breaching the leading edge of the wing, the official said, speaking on condition of anonymity.
A chunk of foam, perhaps containing ice or other debris, broke off the tank during Columbia's liftoff on Jan. 16 and sideswiped some of the heat-resistant carbon panels on the leading edge at 500 mph and possibly also some of the metal and tiles underneath.
A spokeswoman for the Columbia Accident Investigation Board, Laura Brown, said the tape from the data recorder holds a significant amount of good data from at least 420 sensors that were located across Columbia's wings, fuselage and tail, mainly temperature and pressure measurements.
The temperature surges in the leading edge were captured on tape 16 seconds after Columbia began experiencing peak heating in its plunge through the atmosphere on Feb. 1, Brown said. These unusual temperature readings - apparently caused by the searing gases that penetrated the left wing, almost certainly along the leading edge - occurred more than a minute earlier than previously reported, she said.
Data transmitted from Columbia to Mission Control during the final minutes of the doomed flight indicated a temperature surge in the left main landing gear just before the shuttle crossed the California coast on its way to a Florida touchdown. The latest information shows the heat trouble began one minute and eight seconds before that, Brown said.
"What we've got looks very good," Brown said. She noted that the analysis of the recovered tape will continue throughout this week, and that investigators hope to learn a little more each day about what happened to Columbia just before it broke apart over Texas. All seven astronauts were killed.
The data recorder, found intact on a damp slope in East Texas on March 19, held 9,400 feet of magnetic tape that was duplicated at Kennedy Space Center last week. A copy of the tape was flown Friday to Johnson Space Center in Houston, where 100 engineers and other experts spent the weekend analyzing it.
One board member, Scott Hubbard, said last week that the tape from the data recorder could hold "a gold mine of information," and Brown said it looks more and more like that may prove true.
The data recorder, located beneath the lower floor of Columbia's crew cabin, collected measurements not only during virtually the entire descent but also of the Jan. 16 launch. It was running up until just a few seconds before the shuttle disintegrated.
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On the Net:
Columbia Accident Investigation Board: www.caib.us
Bump and Ping.
[If you want off or on my Columbia ping list, let me know. FReegards.]
Non sequitur alert. It's pretty clear that the TPS on the left wing was damaged at the time of re-entry or earlier, but that fact in no way proves how it was damaged or when. Marcia Dunn is usually better than this.
I did e-mail one of my instrumentation friends at KSC over the weekend. Maybe he'll have some information.
April 18 — Investigators now have the strongest evidence yet that the space shuttle Columbia's left wing was critically punctured during liftoff, when falling debris started the fatal chain of events that led to the breakup of the shuttle when it re-entered Earth's atmosphere, ABCNEWS has learned.The evidence comes from an old magnetic tape recorder that is part of the Orbiter Experiment Support System, sources said.
It shows an unusual temperature increase in a key sensor just behind the leading edge of the left wing near the spot where foam that fell from the shuttle's external fuel tank is suspected of striking the shuttle, just 81 seconds into the flight.
The temperature spike happens within the next 40 seconds. Usually during this phase of flight, the temperature would be decreasing or holding steady, sources said.
I can't recall when the wind-shear was encountered on ascent.
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