Test-flights "may" uncover a shortcoming, but I'd bet a pound to a pinch of sh1t that the problem lies in the charger-unit.
cockney steve....then why replace only the
BATTERIES as though the certificate depended on it?
question: As well as being 'self certifying', when did Boeing also become
"SELF INVESTIGATING"? Since BA038?? Before?
Objectivity is on life support......
I think a summary. A brief one.
Have not seen anything here that was not addressed by all concerned in the development and certification process.
Best efforts, best practice resulted in uacceptable failure trail, BY DEFINITION. The regulations were too minimal. If "Relaxed" to accomodate continued use, the Regulatory paradigm becomes a laughingstock, instead of just a wink wink....
At the very outset, the sham 'specials' were an obvious permission slip to utilize a technology that cannot be made safe for aircraft in commercial carriage. The recent hasty "Permission" to transport this "cannot be made safe" technology on aircraft only emphasizes the desperation of a failing attempt to salvage it.
I think Lithium Ion power on aircraft is done.
I think any "Test flights" are pretty much for show. Or to position a/c, as EEngr says.