Morgans wrote:
"Steven P. McNicoll" wrote


A clearance is required to operate on a taxiway, operating on a
taxiway without a clearance does NOT constitute a runway incursion.


I agree fully with that. Isn't there an official term for operation
on a taxiway without permission, or operating equipment that does not
have a yellow blinking light? I seem to recall "unauthorized
movement" or something like that.


Unauthorized operation on a taxiway would be a Pilot Deviation, Vehicle
Deviation, or Pedestrian Deviation, depending on the culprit.