Bell 412 HP & EP share the same drivetrain...no difference (including the the ITT/N1/Tq trim switch). They both use a mast torque (phase shift) system.
Differences are: PT6T-3D engine providing substantially more OEI power and DDAFCS (dual digital AFCS) which allows for optional 4 axis helipilot system. This provides search & rescue modes including auto-hover
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