Hi Alex, you seem to confirm what Pat Boone says in his book: turning the battery switch off inflight (all the rest in normal configuration) will NOT depower the battery bus.
The Battery bus will continue to be powered by TR3, and the battery switch has no effect on this connection.
However, the Boeing system manual says:
"Battery (BAT) Switch
OFF-
. removes power from battery bus and switched hot batery bus when operating with normal powr sources available."
(...)
There is no mention about a difference between the on ground and inflight condition.
BTW, if I remember I'll try in the sim next week.
I used self-made measuring sticks every day in Zaire on my DC3 and similar airplanes, in my previous life, as
all our gauges didn't work.
That was one of my favourite moments of the day, jumping on the wings, fuelling my airplane by myself, smelling the avgas in the middle of the immense and magnificent nowhere...
But I presume you're asking about the 737
No, I've never used them.
That's a maintenance action, and if not in the AFM, the tables are in the Maintenence Manuals.
If that happens outstation, better have a company phone to hang on it!
LEM