EgyptAir 804 disappears from radar Paris-Cairo

[Old Boeing Driver]

A couple of questions

I've been away from this thread.

Does this model Bus have an auto emergency descent capability.

I know I saw this asked in this thread, but have not seen an answer.

Also in this thread, someone asked about inadvertent thrust reverser deployment.

I know it is a different model aircraft, but the Lauda 004 incident comes to mind. There is still controversy about whether a high speed deployment would be survivable.

Finally, had anyone stepped up to claim responsibility for this accident?

Thanks for any answers.