Commuter taxied on runway without clearance.

Attributes
ACN	80337
Time
Date	198801
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : den
State Reference	CO
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 3500 flight time type : 2000
ASRS Report	80337
Person 2
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	incursion : runway
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation other
Situations
Airport	other physical facility

Narrative:

We received clearance by ground to taxi to runway 26R and hold short of runway 7 on delta. Delta taxiway is also runway 7/25 and vise versa. When we were turned over to tower we were holding short of runway 7. We thought tower said taxi to runway 26R via delta and we continued our taxi. Halfway down runway 7 (delta) tower called us and asked us if we had clearance to taxi on runway 7. We replied he had clrd us to taxi. He said he had given us clearance to taxi to 26R via delta and hold short runway 7. We were already holding short? We apologized and there was no further problem. When we got to the end of the runway there was another twin aircraft behind us. Were there 2 airplanes inadvertently on the runway/taxiway? Oh well, my first officer made the comment, from now on, he'll give full readback to ground instructions. I agree fully. It was very busy on the ground. Maybe with all the radio congestion we misunderstood. Maybe the controller made a mistake?

Original NASA ASRS Text

Title: COMMUTER TAXIED ON RWY WITHOUT CLRNC.

Narrative: WE RECEIVED CLRNC BY GND TO TAXI TO RWY 26R AND HOLD SHORT OF RWY 7 ON DELTA. DELTA TXWY IS ALSO RWY 7/25 AND VISE VERSA. WHEN WE WERE TURNED OVER TO TWR WE WERE HOLDING SHORT OF RWY 7. WE THOUGHT TWR SAID TAXI TO RWY 26R VIA DELTA AND WE CONTINUED OUR TAXI. HALFWAY DOWN RWY 7 (DELTA) TWR CALLED US AND ASKED US IF WE HAD CLRNC TO TAXI ON RWY 7. WE REPLIED HE HAD CLRD US TO TAXI. HE SAID HE HAD GIVEN US CLRNC TO TAXI TO 26R VIA DELTA AND HOLD SHORT RWY 7. WE WERE ALREADY HOLDING SHORT? WE APOLOGIZED AND THERE WAS NO FURTHER PROB. WHEN WE GOT TO THE END OF THE RWY THERE WAS ANOTHER TWIN ACFT BEHIND US. WERE THERE 2 AIRPLANES INADVERTENTLY ON THE RWY/TXWY? OH WELL, MY F/O MADE THE COMMENT, FROM NOW ON, HE'LL GIVE FULL READBACK TO GND INSTRUCTIONS. I AGREE FULLY. IT WAS VERY BUSY ON THE GND. MAYBE WITH ALL THE RADIO CONGESTION WE MISUNDERSTOOD. MAYBE THE CTLR MADE A MISTAKE?

Data retrieved from NASA's ASRS site as of August 2007 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.