A330 ALT LAW without Auto-trim?
Hello all, finally decided to join the forum, i've got a question for the Airbus pilots
I was reading the QF72 report and noticed the A330 reverted to alternate law without auto-trim (like in abnormal attitude ALT law) and it states the crew had to manually trim the aircraft. I'm curious as to how the aircraft would have behaved in this configuration.
As I understand it, the elevators are used by the auto trim for short term inputs, and the THS then moves to fair them. So would the lack of autotrim mean just the THS is frozen with the elevators still providing the flight path stability in ALT law (with manual trim just to fair the elevator)? or would it have had more conventional behavior, with neither elevator nor THS providing flight path stability, requiring manual trim for speed and config changes?
The report doesn't go into much further detail but I was left asking questions about how the load factor demand in ALT law works when the autotrim function is not doing its thing.
I am not a transport pilot so this question is purely out of interest, if any airbus pilots could chip in with their two cents it would be greatly appreciated.
Thanks
Last edited by stabilator; 2nd June 2016 at 11:36.