BAT DISCHARGE 737-800
Howdy folks,
I have a sim session coming up and we are going to look at some electrical failures. I am studying the systems and am making some slow progress but the electrical system has always been a weak point for me on this aircraft. I have been contemplating what the BAT DISCHARGE light means in a practical sense and would appreciate any help or advice with it. We have single battery systems.
If the BAT DISCHARGE light illuminates during flight and I go to the QRH it tells me that the discharge rate is too high and that the battery will last for a minimum of 30 minutes. I understand that, but I can't really picture what has happened in the electrical system.
Looking at Vol 2, the only way I see this light illuminating with the normal configuration of Bat switch in ON and Standby Power switch in AUTO, is
A) if both transfer busses are unpowered ( in which case there would be other problems to deal with first) or
B) there is a draw on the battery from the hot battery bus or the switched hot battery bus and the battery charger is not working.
In scenario B you still have both transfer busses working so I imagine that although the battery could discharge, it wouldn't matter because you have all
The electrical power you want from your generators.
So....my conclusion is that if you are in flight and the BAT DISCHARGE light illuminates all on it's lonesome, it is not going to have a detrimental effect on the flight. I would appreciate your opinion on that conclusion. Also, I would like to hear from anyone who has had inflight problems with the system so that I can gain an understanding of what things actually do go wrong on the line.
Bit of a dry subject I know, any input appreciated.
Framer.