RR
You don't get it. BOEING "demonstrated" that a single cell failure would not "propagate" to adjacent cells, and cause a fire.
The FAA was satisfied that that was the case.
Why should they bother to install a system to protect from something they showed could not happen?
Having failed to predict the problem, they should be relieved of the duty to rejig the tests and certs, and the RTCA requirements should obtain.
Once "burned", twice shy.....
OK?
Last edited by Lyman; 10th Feb 2013 at 18:08.