Jersey*Girl
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http://www.wsj.com/articles/investi...light-804-automated-warning-system-1463954393
By
Andy Pasztor And Robert Wall
May 22, 2016 5:59 p.m. ET
By
Andy Pasztor And Robert Wall
May 22, 2016 5:59 p.m. ET
The sequence of events immediately after the warnings were sent to the groundand why they werent followed by a flurry of other messages covering faults in other systems controlled from the same electronics compartmentposes one of the biggest puzzles confronting investigators and other air-safety experts. The systems messages suggest smoke or fire in what is called the avionics bay, located under the cabin floor and behind the cockpit. But such an event should have prompted many more fault messages, affecting a larger group of circuits, than the seven investigators have determined were transmitted before the crash, according to several people familiar with the details.
One possible explanation for why the warning messages stopped is that the plane abruptly lost electric power. That presumably would have shut off the autopilot and most computerized flight-management systems.
Experts already have analyzed more than 25 years of safety data from the world-wide A320 fleet, according to one person familiar with the details, to try to pinpoint relevant electrical problems affecting the forward avionics compartment. So far nothing in that historical database fits the pattern of fault messages that occurred before the EgyptAir crash, this person said.