Jetdoc..
There still doesn't seem to be any timelines. When does the dc signal to the BCU happen (when the APP button is pushed?). I've been led to believe that the 767 and 744 are different (the 744 definitely bus-isolates at 1500).
"Autoland configurations" could refer to triple engage, etc. Not necessarily bus isolation.
Can you explain the VHF comm glitch?
I believe that a bus failure will only de-isolate the busses above 200' (below 200', the isolation remains and no annunciations are given regarding A/L status).
Rgds.
NSEU