Re-filing a flight plan. When?
Hello to all.
A few days ago, I heard a person who works in the aeronautical field say that if a plane flying IFR suddenly has to deviate from the route connecting two consecutive waypoints (which are part of its filed flight plan) because of an unexpected no-fly zone that suddenly cropped up, it does not have to re-file a flight plan to avoid the zone but it can avoid the no-fly zone and then fly toward the other waypoint.
In a controlled airspace I'm sure that this deviation would need an ATC clearence. But what happens in an uncrontrolled airspace? Shouldn't the pilot at least communicate its intentions to the advisory service? Isn't the flight plan always compulsory for IFR flights even if flying in uncontrolled airspaces?
In addition and more technically speaking wouldn't the pilot need to manually insert (in the FMS) an "off-track" waypoint between the two planned ones to avod the no-fly zone?
I would like to know what you think. Thank you.