Narrative:

The student and I had advised ground controllers at dfw several times that we were unfamiliar with the airport. After landing on runway 31R, we were instructed to taxi via taxiway right and then left on taxiway Z, then over the taxiway Z bridge. We changed ground control frequencys atop the bridge, as we were told. The next controller asked us to turn left on G11 to go to GA area for parking. As we rolled off the bridge, I saw taxiway F, but not taxiway G or G11. I assumed G11 was still to come, and we approached runway 36R. Thinking G11 was still coming and that we were cleared across all runways to get to G11, I told the student to taxi across the runway. As we finished crossing the runway, the ground controller asked our position to the runway. I responded that we had crossed it. He then gave me a phone number to call, and I called it upon parking at GA. I feel that this incident could have been prevented had the student and I known we were to turn left on taxiway G and then take that to G11. The controller was not specific about the 'middle step' of left on taxiway G to get to G11. My student later said he did see taxiway G, but was unaware we were supposed to turn left there. We also should have slowed our taxi and should have been following the taxi diagram more closely. We also should have asked the controller if we were cleared across runway 36R instead of assuming that we were. All in all, better communication between us and ground control would have helped the situation, especially as it was my first time at dfw as PIC. Supplemental information from acn 632255: there was confusion over the instruction, and we received it very close to the intended turn which was on taxiway G. I saw the taxiway G markings, but my instructor did not. Believing the turn was yet to come, we had crossed the hold short line for runway 36R before we realized it. Increasing speed, we got off the runway as quickly as possible, at which point we realized, and were informed by ground control that we had made a mistake.

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Original NASA ASRS Text

Title: BE76 INSTRUCTOR PLT AND STUDENT PLT HAD A RWY INCURSION OF RWY 36R AT DFW.

Narrative: THE STUDENT AND I HAD ADVISED GND CTLRS AT DFW SEVERAL TIMES THAT WE WERE UNFAMILIAR WITH THE ARPT. AFTER LNDG ON RWY 31R, WE WERE INSTRUCTED TO TAXI VIA TXWY R AND THEN L ON TXWY Z, THEN OVER THE TXWY Z BRIDGE. WE CHANGED GND CTL FREQS ATOP THE BRIDGE, AS WE WERE TOLD. THE NEXT CTLR ASKED US TO TURN L ON G11 TO GO TO GA AREA FOR PARKING. AS WE ROLLED OFF THE BRIDGE, I SAW TXWY F, BUT NOT TXWY G OR G11. I ASSUMED G11 WAS STILL TO COME, AND WE APCHED RWY 36R. THINKING G11 WAS STILL COMING AND THAT WE WERE CLRED ACROSS ALL RWYS TO GET TO G11, I TOLD THE STUDENT TO TAXI ACROSS THE RWY. AS WE FINISHED XING THE RWY, THE GND CTLR ASKED OUR POS TO THE RWY. I RESPONDED THAT WE HAD CROSSED IT. HE THEN GAVE ME A PHONE NUMBER TO CALL, AND I CALLED IT UPON PARKING AT GA. I FEEL THAT THIS INCIDENT COULD HAVE BEEN PREVENTED HAD THE STUDENT AND I KNOWN WE WERE TO TURN L ON TXWY G AND THEN TAKE THAT TO G11. THE CTLR WAS NOT SPECIFIC ABOUT THE 'MIDDLE STEP' OF L ON TXWY G TO GET TO G11. MY STUDENT LATER SAID HE DID SEE TXWY G, BUT WAS UNAWARE WE WERE SUPPOSED TO TURN L THERE. WE ALSO SHOULD HAVE SLOWED OUR TAXI AND SHOULD HAVE BEEN FOLLOWING THE TAXI DIAGRAM MORE CLOSELY. WE ALSO SHOULD HAVE ASKED THE CTLR IF WE WERE CLRED ACROSS RWY 36R INSTEAD OF ASSUMING THAT WE WERE. ALL IN ALL, BETTER COM BTWN US AND GND CTL WOULD HAVE HELPED THE SIT, ESPECIALLY AS IT WAS MY FIRST TIME AT DFW AS PIC. SUPPLEMENTAL INFO FROM ACN 632255: THERE WAS CONFUSION OVER THE INSTRUCTION, AND WE RECEIVED IT VERY CLOSE TO THE INTENDED TURN WHICH WAS ON TXWY G. I SAW THE TXWY G MARKINGS, BUT MY INSTRUCTOR DID NOT. BELIEVING THE TURN WAS YET TO COME, WE HAD CROSSED THE HOLD SHORT LINE FOR RWY 36R BEFORE WE REALIZED IT. INCREASING SPD, WE GOT OFF THE RWY AS QUICKLY AS POSSIBLE, AT WHICH POINT WE REALIZED, AND WERE INFORMED BY GND CTL THAT WE HAD MADE A MISTAKE.

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.