Hi Bearfoil,
Originally Posted by Bearfoil
You were here in the very first thread. Do you remember the action about the AH deselect on 447? It was a big knock on Air France, (as was the pass on BUSS) and my memory is that The FD's were gone, and the PF had no Pitch. Do you remember it the same way? The upshot was, if the PF had a horizon, his SA would have been nails, and no crash.
What I recall is that the Pilots were commanded to fly PITCH and POWER, but were helpless w/o instruments to pin that down. Am I misremembering?
I don't really follow you. What do you meant here?
1. There is no link between FD (Flight Director) and Artificial Horizon. A/H was displayed during this night on Captain and F/O's PFD (Primary
Flight Display) just fine... they absolutely never lost it - there is not a single fault detected in the IR part of ADIRUs that may translate into the loss of those displays!... but also, they had a third A/H source on their large Standby Instrument (ISIS).
2. ISIS (Integrated Standby Instrument System) is an option for A330 that can replace the standard unreadable standby indicators. Hence, for AF, it was a "plus", not a "less".
.3. AF choice to not take this BUSS option is understandable as its draw backs are pretty clear (disconnection of all ADRs) and its readability not very good. It may be very useful if one loss its speed during the final descent or climb phase, but it was not designed to replace those ADRs at cruise in the middle of the South Atlantic.