—STS-133/Discovery External Tank Drama Continues


Spaceflight Now | STS-133 Shuttle Report | Shuttle Discovery launch delayed to late February.

“While a single root cause of the cracks has not been determined, it appears the stringers in question were made using an aluminum alloy from a batch produced in 2002 that has a mottled appearance and may not be as strong as engineers expected.”

No word here on when this was noticed. You would think they would have run something like a coupon of the batch through structural testing before using it for a critical system like the ET. What other compromises have been made in STS production and processing over the years?

They will try to put doublers in this tank and will “probably” get away with it a couple more times. Then they can put these things in museums and let historians argue whether it was all worth it.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s