@CJ :
No point wasting your breath (or fingers), he's long since stopped taking any notice of anyone saying anything that does not fit his theory, and cherry-picking bits from other posts that he can somehow twist and work in there.
His argument seems to be that there's a massive cover-up going on - to whit, the BEA are steering the outcome to "pilot error" because they aren't taking into account the shortcomings of the aircraft based on a bunch of things he just made up.
(Not to mention ignoring facts like the existence of autoland since the '60s...)
There's no "TURB" switch on the Airbus FBW series autopilot as far as I'm aware, but the established procedure seems to be to engage the "Mach/Speed" mode when encountering turbulence, as it monitors airspeed much more strictly - discussed here:
http://www.pprune.org/tech-log/46809...ence-a320.html
Of course that's not particularly relevant to this case as they had no speed data and thus no A/THR, and even beforehand the thrust remained fairly stable.