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The NTSB found that in May 2007, Airbus had issued a service bulletin to modify the electrical system so that the AC power supply would be automatically reconfigured in the event of a failure affecting the #1 bus. The FAA didn’t issue an airworthiness directive to mandate compliance, which the NTSB says it should now do. The Flight 731 aircraft hadn’t been modified. The NTSB also said the FAA should require better guidance and more simulator training about dealing with electrical malfunctions for Airbus A320 pilots.
The EgyptAir probe isn’t the first time Egypt’s ability to handle evidence has been questioned. After a Russian airliner crashed into a sparsely populated and remote section of the Sinai Peninsula in October, authorities were slow to secure the site, people familiar with the scene said at the time. Too many individuals, including government officials, were being allowed access, the people said, without taking proper precautions to maintain the integrity of the physical evidence.
Former U.S. National Transportation Safety Board Chairman Jim Hall, who had a tense relationship with his Egyptian counterparts while investigating the crash of an EgyptAir flight shortly after takeoff from New York’s John F. Kennedy International Airport in 1999, said the NTSB typically relies on salvage experts from the U.S. Navy. They have precise protocols about who can touch debris or human remains, and how they are handled. Based on experience with Egypt’s flag carrier and federal air-safety authorities, he said their “technical ability is hit and miss.”
Egyptian authorities also have struggled in securing scenes such as the sporadic bombings that have struck Cairo since a 2013 coup provoked a wave of attacks against the government. It is typical to see civilians and onlookers walking throughout the bombing sites, even hours after police arrive. Basic procedures, like cordoning off the scene, are rarely followed.
originally posted by: charlyv
Zaph, et al. Does anyone know precisely what frequency these particular black boxes are using? I have seen reference to 37.5 kHz , as in the MH30 incident. However, there is a newer low frequency device out and also a model with a life increase to 90 days, but I think that came too late (not familiar with it), unless somehow retrofitted.
An underwater locator beacon (ULB) or underwater acoustic beacon, is a device fitted to aviation flight recorders such as the cockpit voice recorder (CVR) and flight data recorder (FDR). ULBs are also sometimes required to be attached directly to an aircraft fuselage. ULBs are triggered by water immersion; most emit an ultrasonic 10ms pulse once per second at 37.5 kHz ± 1kHz.
Speculation almost inevitably will try to fill in the gaps in the meantime.
Other possibilities pointed to by Stewart include a grass-roots terror group that wants to remain unknown, or an inside operator who wasn't on the plane but who had access to it. "They could be trying to protect that attacker," Stewart said. ...