GA pilot and air carrier pilot reported a taxiway and runway incursion at mdw which almost resulted ...

Attributes
ACN	1455741
Time
Date	201706
Local Time Of Day	1801-2400
Place
Locale Reference	MDW.Airport
State Reference	IL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Cessna Single Piston Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	Taxi
Flight Plan	IFR
Aircraft 2
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	Single Pilot
Qualification	Flight Crew Instrument Flight Crew Private
Experience	Flight Crew Last 90 Days 60 Flight Crew Total 5000 Flight Crew Type 220
Person 2
Function	Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 197
Events
Anomaly	Conflict Ground Conflict Critical Deviation - Procedural Clearance Ground Incursion Runway Ground Incursion Taxiway

Narrative:

Crossed hold short line though I read back the clearance to cross but must have been another aircraft had asked for progressive taxi; will not cross any hold short lines in future unless positive my aircraft has been cleared when in doubt hold and clarify.

Original NASA ASRS Text

Title: GA Pilot and air carrier pilot reported a taxiway and runway incursion at MDW which almost resulted in a collision.

Narrative: Crossed hold short line though I read back the clearance to cross but must have been another aircraft had asked for progressive taxi; will not cross any hold short lines in future unless positive my aircraft has been cleared when in doubt hold and clarify.

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.

GA pilot and air carrier pilot reported a taxiway and runway incursion at mdw which almost resulted in a collision.