Originally Posted by
BOAC
The last para regarding 'lock' at 8+ is particularly alarming.
May I point you to the fact that similar statements would have to be made for most if not all types of airliners ?
Full NU Trim will overpower the elevator not only in the A330.
And please don't assume it can only happen in an Airbus that you are handed an Aircraft with Full NU trim. AP commanding full NU Trim quitting and handing over a plane with 10° + NU Trim.
Has happened on different types.
I would also appreciate an explanation of how the trim compensates for 'speed' (and which 'speed') ie is its response a direct function of 'neutralising' the resulting elevator input required for speed change or is there a direct 'speed' function for the THS?
Although I don't know for sure how it is technically solved in the A330 the system behaviour strongly points to an inertia based (read IR) system rather than anything ADR.
As always happy to stand corrected.