OG, OK465:
Just for comparison:
In the QF72 involuntary pitch-down 10° ND elevator was applied during about 1 second (2 seconds including ramps). The airplane pitched down from 2.1° NU to 8.4° ND and the normal acceleration reached -0.8 g.
Flight condition FL370, M.815, 265 kCAS, c.g. 25%.