FAA Grounds 787s

[RR_NDB]

787 Thales Battery is: 8 LVP65 cells, 2 PCB*, connectors, connections and case, OK?

Hi,

Turbine D:

I am also sure that everyone is working diligently and very hard to identify and correct the electric problem (note I say electric as it may not be the battery).

The focus in the battery seems VERY CONSISTENT. As far we know:

1) 787 Thales Battery is: 8 LVP65 cells, 2 PCB*, connections, connectors and case.
2) Protections are inside the case.
3) Chargers presented minor faults as per NTSB briefing on BOS JAL
4) Over voltage was not recorded (the bus is not a factor for)
5) A battery of this type SHOULD be PROTECTED internally against outside faults (charger over voltage, diode module short circuit, ,excessive output current, cell voltages out of envelope, cell temperature and case temperature)
6) Two batteries failed

It´s very difficult to imagine the main factor other than the battery. It´s possible but IMO not probable.

There are chances to never understand clearly WHAT (sequence) and WHY in one or both cases.



PS

"It is no fun producing gliders when your customer thinks you are producing a jet aircraft."

Analogy can be made (production continues)

saptzae:

No need, we can do that better by ourselves

(*) including temp sensor(s)