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October 11, 2018
[tech] Reboot Your Dreamliner Every 248 Days To Avoid Integer Overflow … Why Boeing 787s need to be rebooted regularly to avoid integer overflows. ‘Basically it says that all Boeing 787 Dreamliners have to be switched off every 248 days. If they are not reset then the generator control units GCUs will go into failsafe mode and the plane will lose all electrical power. Why exactly? To quote the FAA directive: This condition is caused by a software counter internal to the GCUs that will overflow after 248 days of continuous power. We are issuing this AD to prevent loss of all AC electrical power, which could result in loss of control of the airplane.’
[tags: disasters, Tech][permalink][0 Comments]
April 11, 2018
[sos] “The Clock Is Ticking”: Inside the Worst U.S. Maritime Disaster in Decades … William Langewiesche on the sinking of the cargo ship SS El Faro. ‘As is usually the case, the catastrophe was unfolding because of a combination of factors that had aligned, which included: Davidson’s caution with the home office; his decision to take a straight-line course; the subtle pressures to stick to the schedule; the systematic failure of the forecasts; the persuasiveness of the B.V.S. graphics; the lack of a functioning anemometer; the failure by some to challenge Davidson’s thinking more vigorously; the initial attribution of the ship’s list entirely to the winds; and finally a certain mental inertia that had overcome all of them. This is the stuff of tragedy that can never be completely explained.’
[tags: disasters, The Sea][permalink][0 Comments]