|Quoting A342 (Reply 10):|
Yes. Mechanic trim wheels are not used anymore since the A340-500/-600/-300E came into production. IIRC, they´re also deleted on new A330s. As Starlionblue said, there are electronic trim buttons.
That is not true at all. Trim wheels are still used on all those aircraft. The 346's I fly still has the trim wheel, albeit the trim setting after the engine start has now become automatic.
The 380 is the first Airbus that will not have a trim wheel, instead relying on electrical motors which will activate the control surfaces during an emergency. However, I'm not conversant as to how this system works in it's entirety, someone else can perhaps explain this issue better.
The trim wheels on the other Airbii do not have much of a function, except to set the trim setting after the engine start, trim the aircraft when it is in direct law (with an accompanying ECAM message telling you to do so), and to control the stab trim in case of a full electrical and hydraulic failure. In the Airbus event timeline, this is called a mechanical backup, as the aircraft can only be controlled by the trim wheel and rudders only. In all other circumstances, Airbuses are all fully trimmed automatically, unlike Boeings, where pitch trim is either full manual or semi-auto.