these stabilizer are built to break there.
Some big BS here. There is no intended break line whatsoever.
As pointed out in a more in-depth article here
http://www.pprune.org/tech-log/37634...ml#post4982977 , there is no hard fact that tells us neither in-flight breakup nor steep dive.
The cabin pressure advisory ACARS message can just as well result
from erroneous data from the ADR parts of the ADIRUs - which we already know to have failed.