This post by
PJ2 gives you the indications of THS position.
http://www.pprune.org/tech-log/39510...ml#post5571587
The F/CTL System Display is normally called and must have been in view due to following failures:
ATA 27.23 F/CTL RUD TRV LIM
ATA 27.90 F/CTL PRIM 1 FAULT
ATA 27.90 F/CTL SEC 1 FAULT
A33Zab