British Airways A319 loses displays

[sstaurus]

Forgive me for being a newb, but don't those 'floating ball' attitude indicators that have been used for decades until recently, not require power? Why have they switched to a digital standby that requires power?

[UNCTUOUS]

"Why don't those 'floating ball' attitude indicators, that have been used for decades until recently, require power?

Somebody will surely give you a "run-down" on that shortly

UNC