One more AS experience I just remembered.

A fellow pilot just finished completely rebuilding his A36. We agreed to a
test plan. After the static tests we moved to 6 high speed taxi tests on
the active rwy at RHV. We kept the tower informed before these tests via
phone as a courtesy. On the first HS run, the AS went backwards about 15
dgrees to a stop and stayed there. No big deal, we instantly knew the pitot
and static lines were interchanged. We competed the other 5 runs just to
liftoff and stopped each time with the AS going negative each time. We went
back, changed the lines around and finished the reast of our tests
uneventfully.

Bob F.