Author	[Modern View]
MarkB_MI 01-20-2013 13:11:47 75.198.35.49 Report to Moderator	Did you ever have your luggage frozen solid when you arrived? The entire pressure vessel uses the same conditioned air, including the baggage compartment. If it didn't, Fido and Fluffy would arrive as freeze-dried pets. [Reply]   [No Email]
Charles (in GA) 01-20-2013 19:38:55 24.178.124.21 Report to Moderator	Re: 787 and Li-ion in reply to MarkB_MI, 01-20-2013 13:11:47   Been more than one frozen cat or dog, it does happen. The cargo areas are pressurized, but depending on the aircraft, usually only one area is heated for animals and other temperature sensitive items. In a Boeing 757 and 767 its the aft most bin area, know as the "bulk" bin since it is the area where loose cargo is loaded. Other bins get some amount of heat, but not much. The airplane is insulated, but the cold still soaks thru. The batteries are mounted between the cargo bin sidewall and the outer skin of the aircraft usually (the APU battery in the aft bin). The battery selection is based in large part on capacity of the battery. In event of electric failure, the battery must be able to power certain critical circuits for a given period of time, 30 minutes If I recall. Given all of the electric gadgets in the 787, there is a greater need for power, just for the essential stuff in an emergency, hence a more powerful battery is needed. I suspect Boeing went with the Li-ion battery to keep the weight down and still maintain capacity (amp/hrs) LiSO2 batteries have been banned in aircraft for some 30 years now. I don't know how different a Li-ion battery is, but its not uncommon to have a laptop catch fire, or a cell phone, when the sophisticated circuits that control the charge rate and such fail. Too much new technology in one aircraft. Charles [Reply]  [No Email]
buickanddeere 01-20-2013 15:02:05 74.220.189.226 Report to Moderator	Re: 787 and Li-ion in reply to MarkB_MI, 01-20-2013 13:11:47   Depends on the plane. Not every cargo hold is pressurized and/or heated on every aircraft. [Reply]  [No Email]
steve706 01-20-2013 17:53:22 216.208.94.148 Report to Moderator	Re: 787 and Li-ion in reply to buickanddeere, 01-20-2013 15:02:05   Out of interest buickanddeere, are you an AME? [Reply]  [No Email]
big fred 01-20-2013 19:31:22 174.21.209.92 Report to Moderator	Re: 787 and Li-ion in reply to steve706, 01-20-2013 17:53:22   Aviation medical examiner? [Reply]  [No Email]
steve706 01-21-2013 13:56:25 216.208.94.172 Report to Moderator	Re: 787 and Li-ion in reply to big fred, 01-20-2013 19:31:22   AME stands for aircraft maintenance engineer, the canadian version of an airframe& powerplant mechanic. [Reply]  [No Email]
big fred 01-21-2013 17:00:05 174.21.201.149 Report to Moderator	Re: 787 and Li-ion in reply to steve706, 01-21-2013 13:56:25   My last doctor was an AME, aviation medical examiner. [Reply]  [No Email]