On Tue, 04 Apr 2006 16:25:24 -0400, Peter R. wrote:

You don't move them until liftoff.

At least in the planes I fly, checking for proper control motion is a
checklist item during the run-up. Removing the control lock is one of the
first preflight items. So there are at least two opportunities to catch
this.

If there's a nontrivial wind, then correction for wind during taxi
provides a third opportunity.

- Andrew