An aircraft mistook an active runway for a taxiway and taxied onto the runway instead of crossing th...

Attributes
ACN	1340681
Time
Date	201603
Local Time Of Day	1801-2400
Place
Locale Reference	CCR.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	M-20 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	Taxi
Route In Use	None
Aircraft 2
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	Taxi
Route In Use	None
Flight Plan	VFR
Person 1
Function	Ground
Qualification	Air Traffic Control Developmental
Person 2
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Commercial Flight Crew Instrument
Experience	Flight Crew Last 90 Days 10 Flight Crew Total 3400 Flight Crew Type 2500
Events
Anomaly	Conflict Ground Conflict Critical Deviation - Procedural Clearance Ground Incursion Runway Ground Incursion Taxiway

Narrative:

Aircraft Y landed and exited at the end of the taxiway as instructed by local. The pilot's request was to taxi back to the runway for another departure which was granted via taxiways to the runway. Aircraft X landed and was instructed by local to turn left at a taxiway cross the active parallel runway then contact ground. Aircraft X actually stopped on the active runway then proceeded to contact me on ground frequency. I coordinated with local to cross aircraft X which he approved. I then told aircraft X to cross the active; pass behind the cessna then begin his taxi to parking which is on the east side of the field.aircraft X made a left turn on the active runway thinking he was on the taxiway. I noticed immediately then local gave me control of the runway to get aircraft X off the runway since he would now have to taxi down to a different taxiway. I then instructed aircraft X to hold his position for aircraft Y that will pass from his right to left. Aircraft X exited runway then made a right turn onto the taxiway nearly crashing into aircraft Y. I stopped aircraft X just in time and aircraft Y had just enough room to get around him.

Original NASA ASRS Text

Title: An aircraft mistook an active runway for a taxiway and taxied onto the runway instead of crossing the runway.

Narrative: Aircraft Y landed and exited at the end of the taxiway as instructed by local. The pilot's request was to taxi back to the runway for another departure which was granted via taxiways to the runway. Aircraft X landed and was instructed by Local to turn left at a taxiway cross the active parallel runway then contact ground. Aircraft X actually stopped on the active runway then proceeded to contact me on ground frequency. I coordinated with Local to cross Aircraft X which he approved. I then told Aircraft X to cross the active; pass behind the Cessna then begin his taxi to parking which is on the east side of the field.Aircraft X made a left turn on the active runway thinking he was on the taxiway. I noticed immediately then Local gave me control of the runway to get Aircraft X off the runway since he would now have to taxi down to a different taxiway. I then instructed Aircraft X to hold his position for Aircraft Y that will pass from his right to left. Aircraft X exited runway then made a right turn onto the taxiway nearly crashing into Aircraft Y. I stopped Aircraft X just in time and Aircraft Y had just enough room to get around him.

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.