Posted by GarryinNC on January 20, 2013 at 12:24:33 from (188.8.131.52):
In Reply to: 787 and Li-ion posted by George Marsh on January 20, 2013 at 09:03:08:
All of the volume contained between the forward and aft pressure bulkheads is heated/cooled. Air is bled off the compressor sections on the engines and run through an air cycle machine if it needs to be cooled. That is true on transport category jets since the 707 days, but I think I did read that the 787 is somewhat different. It may use an electrically driven compressor to accomplish AirCon/Pressurization.
The FAA has certified 2 engine jets for over water operation since the advent of the Boeing 757/767 under a program called ETOPS, for extended range operations. Under a 180 minute ETOPS rule you can lose an engine and be allowed to fly for 180 minutes at single engine cruise to get to the nearest land.
Seems like the biggest worry with this 787 battery problem would be to have a battery fire or thermal runaway over the ocean and still have to fly 3 hours or so to land. UPS lost an airplane in Dubai when some computer batteries they were carrying as cargo shorted or ran away and started a fire. The pilots overflew a suitable airport while trying to get back to their departure airport. They were overcome by the smoke/fumes which was believed to be so thick they could not see, even with O2 masks and smoke goggles.
This post was edited by GarryinNC at 17:08:56 01/20/13 2 times.
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