wrote:
...
When you look at the complexity of the APU unit, it WILL be a
relatively minor tweek.
...

I don't think replacing the batteries with a safer, heavier
technology and redesigning/recertifying the electrical systems
of the plane can even be called a "tweak," let alone a "minor
tweak."

|
| MIT Professor: Battery Fix Could Ground 787 Until 2014
| ...
| In a nutshell, Sadoway thinks that Boeing needs to monitor
| the temperature and cool each of the eight cells of the
| 787's lithium-ion battery or switch to an older battery
| technology that has a far better safety record -- nickel
| metal-hydride (NiMH).
|
| If Boeing opts to substitute NiMH for lithium-ion,
| certification could result in delays of up to a year --
| effectively grounding the 787 until 2014.
| ...
| When Sadoway got a look at the lithium-ion battery used in
| the 787, he was surprised by "the seeming absence of a
| cooling apparatus."
| ...
http://www.forbes.com/sites/petercohan/2013/01/27/mit-professor-battery-fix-could-ground-787-until-2014/

--bks