Before revision: Besides providing automatic landing, automatic ground roll and extensive en route facilities, the Trident AFCS also provides automatic overshoot (go-round) which is essential for Cat.II operation, PVD (paravisual display) ground roll guidance for take-off in 100 metres RVR (runway visual range) and as back up to the ‘’fail-soft’’ automatic rudder control system during Cat.
After revision: Besides providing automatic landing, automatic ground roll and extensive en route facilities, the Trident 's AFCS (Automatic Flight Control System) also provided automatic overshoot (go-round) which was essential for Cat.II operation, PVD (paravisual display) ground roll guidance for take-off in 100 metres RVR (runway visual range) and as back up to the ‘’fail-soft’’ automatic rudder control system during Cat.