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Beerlight

Indicated airspeed of Columbia?

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Feb. 13, 2003

Steve Nesbitt
Columbia Accident Investigation Board
713/301-9571



Release: #H03-072

STATEMENT BY THE COLUMBIA ACCIDENT INVESTIGATION BOARD

Note: The CAIB has asked NASA for administrative support to release information to the public and the media. The following statement was provided by the CAIB for release.

Thermal Analysis Shows Hot Plasma Possible in Columbia Left Wheel Well Area

Preliminary analysis by a NASA working group this week indicates that the temperature indications seen in Columbia's left wheel well during entry would require the presence of plasma (super heated gas surrounding the orbiter during re- entry).

Heat transfer through the structure as from a missing tile would not be sufficient to cause the temperature indications seen in the last minutes of flight.

Additional analysis is underway, looking at various scenarios in which a breach of some type, allowing plasma into the wheel well area or elsewhere in the wing, could occur.

Other flight data including gear position indicators and drag information does not support the scenario of an early deployment of the left gear.

The search continues for possible debris from Columbia in the western U.S., but as of early Thursday, no debris further west than Ft. Worth, Texas has been confirmed as Shuttle- related.




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>but is there any chance the left main dropped out of the well?

Could be, but doubtful; the uplock indicator showed it was still up. There were several other off-scale readings indicating destroyed sensors or wiring.

I found it eerie that the port sill longeron showed heating; that's above the wing, near the hinge on the left side cargo bay door.

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>By the time the shuttle has slowed to 15,000 mph the shuttle should be
> at about 20 psi and pitch RCS is turned off -- elevons then control pitch.

I think you mean psf. You'd have to be about a mile below sea level to get 20psi.



a mile below sea level in air.... right?:)

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