Narrative:

This appears to be an ongoing problem; reported by a number of pilots I have talked with. This issue is that the route I filed appears to have been changed; and the departure clearance was to fly 'as filed.' however; that is not what ATC expected me to fly. This could lead to conflicts.I filed an IFR flight plan using foreflight. The route was direct from ZZZ to ZZZ1. Within a minute of filing; I received a text message giving me a different route to expect. I entered this route into my foreflight flight plan.when I called for my clearance with ground control; I was given the clearance to proceed 'as filed.' since I had filed direct; I entered that into the aircraft's GPS and planned that route.when I was cleared by the tower for takeoff; the clearance was 'cleared for takeoff runway 4L; turn left direct zzzzz.' that seemed strange for the 'direct' clearance I was given by ground.once airborne; I checked in with departure control and told them I was cleared direct to ZZZ1; and asked them to confirm that was the routing they were seeing. No; they said. And they gave me the full route (which matched the 'expect' routing I was texted).fortunately; the sky was clear and I was not overloaded. In busy airspace; in IMC; getting a completely new full route clearance at 1;000 feet AGL could be a problem.it appears that the something is happening to the routing clearance; and the controller either is unaware that what he or she is seeing is not what was filed; or that information is available to the controller; and he or she is missing the fact that this is a new routing. Either way; the controller must not issue 'cleared as filed' when someone or some computer has changed the routing from what was originally filed.

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Original NASA ASRS Text

Title: BE58 pilot reported confusion with IFR clearance related to changes in filed route then cleared as filed.

Narrative: This appears to be an ongoing problem; reported by a number of pilots I have talked with. This issue is that the route I filed appears to have been changed; and the departure clearance was to fly 'as filed.' However; that is not what ATC expected me to fly. This could lead to conflicts.I filed an IFR flight plan using Foreflight. The route was direct from ZZZ to ZZZ1. Within a minute of filing; I received a text message giving me a different route to expect. I entered this route into my Foreflight flight plan.When I called for my clearance with ground control; I was given the clearance to proceed 'as filed.' Since I had filed DIRECT; I entered that into the aircraft's GPS and planned that route.When I was cleared by the tower for takeoff; the clearance was 'Cleared for takeoff runway 4L; turn left direct ZZZZZ.' That seemed strange for the 'direct' clearance I was given by ground.Once airborne; I checked in with departure control and told them I was cleared direct to ZZZ1; and asked them to confirm that was the routing they were seeing. No; they said. And they gave me the full route (which matched the 'expect' routing I was texted).Fortunately; the sky was clear and I was not overloaded. In busy airspace; in IMC; getting a completely new full route clearance at 1;000 feet AGL could be a problem.It appears that the something is happening to the routing clearance; and the controller either is unaware that what he or she is seeing is not what was filed; or that information is available to the controller; and he or she is missing the fact that this is a new routing. Either way; the controller must not issue 'cleared as filed' when someone or some computer has changed the routing from what was originally filed.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.