Might not be a bomb. EASA has just (10 May 2016) come out with a proposed AD to prevent a rudder malfunction that might cause the vertical stabilizer to separate. I like Airbus, I really do, but they have grossly overcomplicated the flight control systems on a class of aircraft that is hardly bigger than the DC-9. Also, did the Egyptians ever release any flight data recorder information on the Russian aircraft that crashed in the Sinai?