Grebllaw123d,
Yes I do understand that you think that I have made a mistake in my statement but I can assure you that I have not. You see having flown all of the A340 variations, which you may well have only flown the A340-300, I can tell you emphatically that the A340-500 and A340-600 no longer has mechanical backup but rather backup. And yes there is a difference. You see with mechanical backup you have mechanical control over the horizontal stabilizer and the rudder, but with backup you only have mechanical control over the horizontal stabilizer.
This is also the same for the MSN 660 which is now missing. It's flight controls are electrically controlled and are hydraulically operated but the stabilizer can be mechanically controlled. However like I said you would not know this if you only fly the A343 and yes it is the same as some of the older generation A330's but is not the same as MSN 660.
Now an apology is not required from you but please do your homework before you respond next time.