"tscottme" wrote
Anyone know why the elevators on MD-80s, while parked or taxiing on
the ground, are almost always split? By that I mean the elevator on
the left side is up and elevator on right side of rudder is down. I
don't recall seeing thie elevators split left/down and right/up and I
don't recall 737s showing split elevators, but that may just be a
faulty memory.

Speaking for B-707s, the elevators are not connected to each other and
are not even connected to the control column, they free float. They are
positioned by airflow over the control tabs which are pilot controlled.
At rest on the ground, the wind positions them, at random.

The MD-80 might be similiar.

Bob Moore
ATP B-727, B-707, L-188