JJS wrote:

With no
autopilot and while flying in rough air, an attempt at the Heimlich
maneuver would undoubtedly lead to an out of control aircraft over
mountainous terrain. What would you have done.

It is possible for a person to perform the Heimlich maneuver on him or
herself. Assuming the passenger was not panicking, my first thought
would be to talk her through the maneuver.

--
Peter