LT and 3hole,
- So far there is still no mention of the primary attitude data or displays going t!ts-up at any time, so discussing the standby horizon is just a sideline... (my firm made them, hence my interest).
- I know there were some photos, but that's the trouble with these forums with hundreds of posts each.... find them!
And not all A330 flight deck instrument fits are identical, so how to confirm you are really looking at the AF447 flight deck?
LT, in 'my' days, the (mechanical) standby horizon ran off the emergency DC bus via its own inverter, and it had its own 'high-speed' gyro, that would keep running on its own inertia for minutes even after electrical power totally disappeared.
I have no idea whether ISIS, or any other standby horizon fitted today, has its own little battery pack (lithium, four AAAs?) to keep the LCD display alive, 'when all else fails'.
Apologies for the O/T.