When I flew the classic the F/Es during their bi-annual checks were always asked to understand the intent of the checklist and therefore the appropriate time to action it, or part there of in case of running multiple checklists that possibly overlapped. I must admit flying glass it's all to easy to jump straight in with the QRH or electronic checklist as soon as an EICAS/ECAM appears, as that's the way it usually works in the sim.
A case like this may have allowed the crew to say ok the STBY BUS is unpowered however the A/C is flying normally X,Y and Z are powered by it, but haven't failed at this point or have but are not required until decent/approach or landing therefore we have time to collect more information from the FCOM other manuals, engineering.
If it's obvious that the failure needs to be actioned immediately then it will and an immediate landing may be made.
It may have been possible to cycle the stby power switch to re-charge the batteries. Checklists cannot cover all scenarios and this is a good example which may result in a system or SOP/QRH change.
Crew did what they thought was right as they should, all safe and we get to learn something that may help in the future.
Last edited by SMOC; 1st Nov 2008 at 01:59.