Hi
John_T,
Yeah, it's been a while. Would the case you cite be a Turbo-Prop out of Sydney, after the tail cone filled with water after an overnight down-pour?
The pilot, who I know very well, did a series of vertical banks as the nose rose, until the water "sloshed" out due to his manoeuvres, and things became fairly normal again.
Thank goodness that the pilot was an ex RAAF Mirage pilot, who was well familiar, and competent with unusual attitudes at low level. Even so, he was an exceptionally good pilot
Regards,
Old Smokey