From a few friends involved in 787, and a few not well publicized comments/documents about the 787. One selling feature was to be able to have higher humidity in the 787 than on a regular aluminum bodied airliner due to less or virtually zero corrosion issues resulting from passenger breath and temperature deltas in flight, along with a lower cabin altitude.
But during early flight tests, some wags considered renaming it the rainliner, due gto unexpected amounts of condensation in the cabin. Which admittedly was not in a well finished cabin configuration, but filled with instrumentation racks, exposed insturmentation wiring, etc.
Business & Technology | Dreamliner's woes pile up | Seattle Times Newspaper
. . .
The latest delay will at least give engineers more time to test design fixes, including some for less consequential troubles, not uncommon on new jets, such as the maddening drip, drip, drip of "rain in the plane." On 787 flight tests, drip trays padded with squares of absorbent cloth are positioned to collect the condensation.
Fancher said "a good design fix" to dehumidify the interior is being installed and will be tested when the Dreamliners resume flying.
Employees working on the 787 complain about insufficient oversight of suppliers and a management system that the senior engineer called "totally broken."
"This program is not like anything we've seen," said the veteran 787 employee. "It's a screwed-up mess." . . .
Now add to that the wonderous decision to use predominately aluminum wiring to save weight instead of copper or copper/silver alloy or similar.
http://www.safran-group.com/IMG/pdf/EN_mag2_29-31-2.pdf
Now for flight data and computer data lines with low voltage and low current, aluminum ** might ** be an acceptable choice.
But years ago, the push for house wiring of aluminum met eventually with corrosion or similar problems due to buildup of non conductive films on aluminum, resulting in hot spots and IF I RECALL a few fires.
Check your local replacement power plug or switch in the us and the warning re cu aluminum and the availability of a cu-al grease/coating to preven oxidation.
Surely BA would have considered that ???????????