I did try to clarify to prevent discussion:
I think you understand but for the ones which do not:
Pls don't consider the THS being locked but read as:
"If THS > 8 up (and no autotrim available), full elevator pitch down authority may be insufficient for speeds above 180 knots."
But I get the impression I failed..........
This remark is given in the mentioned FCOM 3.....when a FCTL STAB CTL FAULT is present. This was for sure
NOTthe case here. The THS was free (
NOT locked) to move Airplane Nose Down.
What it will say is that full elevator authority alone is not sufficient to counteract the PITCH UP THS position if this is > 8 ANU and if Speed > 180 Knots.
If THS <=8 ANU the elevator deflection alone can counteract a THS 8 (or less) ANU position.
If SS input was FWD the THS would have followed the command as designed.
@ BOAC:
The FCPC gets ADR & IR information to compensate for speed.
The IR part can't be compared to the old INU systems, this is very precise accelerometers and 3 axis ring laser gyros equipment and yes the crew is allowed to have a peek on the same signals through its PFD.
There is an interface with ATA 76 (engine controls) but these are discrete signals only and used for ground spoiler logic(T/L position), for 3rd T/R lock release and for limitation of the green servo control speed in case of a dual engine failure.
@CS:
Maybe you have better eyes then me, I need periscopic glasses to do it without interfering the guys on P1 or P2.