Originally Posted by
CONF iture
As anticipated, PJ2 never wrote anything like it.
I oversimplified the description, but it seemed pretty clear to me that with autoflight off, the only thing that can move the THS is pilot input, PJ2 agreed with that.
As you don’t seem to realize what’s the function of a trim, if you have a chance, go in a flying club and see by yourself if you are able to apply a full deflection before you feel the urgency to trim.
Chris Scott and Lonewolf_50 are more diplomat than I am, but what you wrote simply don’t make sense.
No need to be insulting, I know what the function of aircraft trim is. In normal circumstances that's what it's used for. Under Alt law, the autotrim is designed to follow the pilot's sidestick commands. This gives the pilot regular trim control through the sidestick, but has the additional side-effect of effectively giving them full pitch authority with little or no interference from the computers.
Chris has been kind enough to state that his "G" theory is just that - a theory. I'll try and track down some information over the next couple of days to confirm or refute that theory - I've also sent some PMs to people who might know.
If you want to get personal, I could say that at least I'm not trying to defend a man guilty of the manslaughter of three people who to this day is still arrogantly unrepentant about not taking responsibility for those deaths.
Trim wheel has priority over the electrical control but does it 'disable autotrim for the duration of the flight' ?
Now, you won’t mind if I ask to back up that one …
A330 Flight Deck and Systems Briefing
Page 5.13
The control wheels are used in case of major failure (Direct Law or mechanical back-up) and have priority over any other command
The implication is that manual trim will have priority and can be used for the duration of the flight if the pilots are not happy with what autotrim is doing. Svarin claimed in an earlier thread that some airlines train pilots to avoid use of the wheel for that reason (which IMO is a dreadfully myopic practise).