On Friday, February 14, 2020 at 4:45:04 PM UTC-5, Al McNamara wrote:
At 19:24 14 February 2020, John McLaughlin wrote:
Is it normal practice to have the ASI use cockpit static and to disconnect
the external static vents, due to ASI errors when dumping water?
No

Except IIRC some are equipped with a panel switch to do so during dumping.
Normally not!

A switch is also common in some older gliders notorious for sucking water into
the statics during dump (LS-3, LS-4 come to mind).