Posted by big fred on January 20, 2013 at 19:29:05 from (174.21.209.92):
In Reply to: Re: 787 and Li-ion posted by GarryinNC on January 20, 2013 at 17:13:38:
Overnight stays are the reason that airplane electronics need to be qualified to operate at -40C after cold soak at -55C. Critical electronics and those needed to start the engines need to be qualified to operate at -55C. There are further requirements for equipment located outside the pressure hull, such as at the engines and control surfaces, to operate at the lowest temperature expected, which is a function of outside air temperature at altitude and minimum airspeed at that altitude. And of course there are corresponding qualification requirements for the high temperatures.
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