Narrative:

We were a B727 taxing from our ramp onto taxiway south for takeoff on runway 17L. As we approached taxiway south the first officer called ground for clearance to taxi for takeoff. Ground replied taxi on south for runway 17R. I didnT quite hear the instruction so I asked the first officer what our clearance was. He said taxi to runway 17R. We cleared runway 17R for traffic on final and seeing no one on approach proceeded to cross runway 17R on taxiway south. After crossing the runway ground radioed that he wanted us to hold on south prior to crossing runway 17R because he indeed did have traffic on final. He then repeated his instructions to us that would indicate according to FAA standard phraseology that we were cleared to cross all runways up to but not including the departure runway. He apologized to us for the confusion in his possible wording and we apologized to him for not being more alert to his transmission. The light twin on final was in no jeopardy and landed without incident. Supplemental information from acn 529129: cleared taxi to runway 17R, via taxiway south. we understood cleared to cross 17R at south which is the only taxiway out of cargo ramp to the runway. Taxi route requires crossing runway 17 at south and then north on partial taxiway to approach end. As we cleared the runway ground told us to continue but that we should have held short on runway 17 at south. We all concurred that we were cleared to cross prior to crossing and that both directions were clear visually.

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Original NASA ASRS Text

Title: B727 CREW AT LUB INCORRECTLY CROSSED THE RWY THEY WERE CLRED TO.

Narrative: WE WERE A B727 TAXING FROM OUR RAMP ONTO TXWY S FOR TKOF ON RWY 17L. AS WE APCHED TXWY S THE FO CALLED GND FOR CLRNC TO TAXI FOR TKOF. GND REPLIED TAXI ON S FOR RWY 17R. I DIDNT QUITE HEAR THE INSTRUCTION SO I ASKED THE FO WHAT OUR CLRNC WAS. HE SAID TAXI TO RWY 17R. WE CLRED RWY 17R FOR TFC ON FINAL AND SEEING NO ONE ON APCH PROCEEDED TO CROSS RWY 17R ON TXWY S. AFTER CROSSING THE RWY GND RADIOED THAT HE WANTED US TO HOLD ON S PRIOR TO CROSSING RWY 17R BECAUSE HE INDEED DID HAVE TFC ON FINAL. HE THEN REPEATED HIS INSTRUCTIONS TO US THAT WOULD INDICATE ACCORDING TO FAA STANDARD PHRASEOLOGY THAT WE WERE CLRED TO CROSS ALL RWYS UP TO BUT NOT INCLUDING THE DEPARTURE RWY. HE APOLOGIZED TO US FOR THE CONFUSION IN HIS POSSIBLE WORDING AND WE APOLOGIZED TO HIM FOR NOT BEING MORE ALERT TO HIS XMISSION. THE LIGHT TWIN ON FINAL WAS IN NO JEOPARDY AND LANDED WITHOUT INCIDENT. SUPPLEMENTAL INFO FROM ACN 529129: CLRED TAXI TO RWY 17R, VIA TXWY S. WE UNDERSTOOD CLRED TO CROSS 17R AT S WHICH IS THE ONLY TXWY OUT OF CARGO RAMP TO THE RWY. TAXI RTE REQUIRES CROSSING RWY 17 AT S AND THEN N ON PARTIAL TXWY TO APCH END. AS WE CLRED THE RWY GND TOLD US TO CONTINUE BUT THAT WE SHOULD HAVE HELD SHORT ON RWY 17 AT S. WE ALL CONCURRED THAT WE WERE CLRED TO CROSS PRIOR TO CROSSING AND THAT BOTH DIRECTIONS WERE CLR VISUALLY.

Data retrieved from NASA's ASRS site as of July 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.