Dear All
I fly B767 and 757, my airline is heavily into laptops on the A/C, all pilots have been issued with them. Powersupply on the flightdeck at manufacture was 115vac at 400Hz, this is not acceptable for our laptop transformers as they can only cope with about 60Hz, as someone mentioned if you use this power the transformers get hot and I suspect will have a short life.
We have fitted 115vac at 50Hz in the flightdeck there are three outlets LHS RHS and 1st OBS, this was a major job and done on a C check.
I think they are supplied from the utility busses, but I am still tring to find out.
ATB