Erickson S-64 Rear Seat Yaw Control
PT6ER and Maxtork; just guessing, but Sikorsky sold the S-64 FAA Type Certificate to Erickson, and from what you both have reported, it sounds like they modified the rear seat control to remove the directional capability.
Fly911, I think your two pictures depict the two S-64 models, which had differing " back porches" as they used to be called.
Thanks,
John Dixson