The UK - unlike other NAAs - requires all engine failure training to be carried out at 90% of the RTOW appropriate for that day's weather conditions. The S76 vertical is particularly brutal and guaranteed to terrify you the first time you do it. Do an EOL in a Robo and you might bend it but even if you write it off you probably wont have to spend as much on a new one as the S76 owner (stands to attention and salutes) had to pay to mend theirs after a vertical reject went a wee bit wrong (twice I believe).
The 139 is altogether more instructor-friendly. Both engines remain running when you hit the OEI training switch but the aircraft reacts as if a genuine failure had occurred and the displays play the game too. Very clever and much safer.
G.
