There has been a large volume of discussion about the various particular holes in the cheese in this accident.
In the case of this particular hole, had the PF managed to apply 27 pounds to move the rudder 0.6 inches instead of the 32+ pounds to move it 1.2 inches, the triggering event may not have happened.
Part of this particular hole was that there was no broadly shared knowledge at the time of the rudder characteristics at 250 kt. so that once the PF applied rudder he was likely surprised by the response.
I suspect that he tried to correct getting a bunch more rudder than he expected, but was unable to modulate or recognise he had fallen into APC/PIO.
An inch.2 of movement followed by an inch.2 back over a couple cycles ... and the fin and rudder were gone.
Last edited by RatherBeFlying; 13th Jan 2007 at 13:56.
Reason: Correction to pedal force numbers: max =32 not 35