A 747 can fly on 3 engines from LAX to London...
Nope, sorry, it did not.
Now, about this diatribe...
... so I can definitely fly my A340 without stdby instruments.
Maybe, maye not.
As with most things in aviation, it depends.
IF it all goes pear shaped (and yes I've had this happen with primary flight instruments...all of 'em) one had better have reliable standby instrumentation...otherwise, up the creek without a paddle might just be the case.
