Narrative:

The incident I was involved in occurred at midway airport on oct/wed/95. The time was about XX00 local. I was the pilot of a C172 giving a flight review with a student. The other aircraft involved was a B737 operated by air carrier X airlines. My student and I taxied to the end of runway 22L and completed our run-up/before takeoff checklist. After contacting midway tower, we were instructed to position and hold runway 22L. We acknowledged the 'position and hold' instructions and took the active. Shortly after, we were cleared for departure. After reading back our takeoff instructions and clearance, I began the ground roll. While on the takeoff roll, I glanced down to check the engine gauges and instruments. Upon looking up, I noticed the B737 had begun to taxi on to our runway 22L. I quickly told my student (who was doing the takeoff) that I had the plane. An aborted takeoff would have certainly caused ground contact with the B737, so I elected to continue with the takeoff. I rotated the aircraft and immediately pitched for best angle of climb. Seconds later, I crossed over the taxiing aircraft and proceeded on course assigned by ATC. Upon landing, I was asked to telephone midway tower. After calling, I found out that the B737 was instructed to hold short of runway 22L. He acknowledged his assigned instructions but unfortunately failed to comply with the instructions. Additionally midway tower confirmed that I was indeed cleared for takeoff as described earlier. Possible contributing factors: intersecting runway/txwys at midway are often difficult to distinguish between. Complacency on behalf of the B737. Lack of monitoring between ground control and tower. Lack of monitoring between ground control and taxiing aircraft.

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Original NASA ASRS Text

Title: NMAC. RWY TRANSGRESSION BY ACR CAUSED TKOF ACFT TO TAKE EVASIVE ACTION.

Narrative: THE INCIDENT I WAS INVOLVED IN OCCURRED AT MIDWAY ARPT ON OCT/WED/95. THE TIME WAS ABOUT XX00 LCL. I WAS THE PLT OF A C172 GIVING A FLT REVIEW WITH A STUDENT. THE OTHER ACFT INVOLVED WAS A B737 OPERATED BY ACR X AIRLINES. MY STUDENT AND I TAXIED TO THE END OF RWY 22L AND COMPLETED OUR RUN-UP/BEFORE TKOF CHKLIST. AFTER CONTACTING MIDWAY TWR, WE WERE INSTRUCTED TO POS AND HOLD RWY 22L. WE ACKNOWLEDGED THE 'POS AND HOLD' INSTRUCTIONS AND TOOK THE ACTIVE. SHORTLY AFTER, WE WERE CLRED FOR DEP. AFTER READING BACK OUR TKOF INSTRUCTIONS AND CLRNC, I BEGAN THE GND ROLL. WHILE ON THE TKOF ROLL, I GLANCED DOWN TO CHK THE ENG GAUGES AND INSTS. UPON LOOKING UP, I NOTICED THE B737 HAD BEGUN TO TAXI ON TO OUR RWY 22L. I QUICKLY TOLD MY STUDENT (WHO WAS DOING THE TKOF) THAT I HAD THE PLANE. AN ABORTED TKOF WOULD HAVE CERTAINLY CAUSED GND CONTACT WITH THE B737, SO I ELECTED TO CONTINUE WITH THE TKOF. I ROTATED THE ACFT AND IMMEDIATELY PITCHED FOR BEST ANGLE OF CLB. SECONDS LATER, I CROSSED OVER THE TAXIING ACFT AND PROCEEDED ON COURSE ASSIGNED BY ATC. UPON LNDG, I WAS ASKED TO TELEPHONE MIDWAY TWR. AFTER CALLING, I FOUND OUT THAT THE B737 WAS INSTRUCTED TO HOLD SHORT OF RWY 22L. HE ACKNOWLEDGED HIS ASSIGNED INSTRUCTIONS BUT UNFORTUNATELY FAILED TO COMPLY WITH THE INSTRUCTIONS. ADDITIONALLY MIDWAY TWR CONFIRMED THAT I WAS INDEED CLRED FOR TKOF AS DESCRIBED EARLIER. POSSIBLE CONTRIBUTING FACTORS: INTERSECTING RWY/TXWYS AT MIDWAY ARE OFTEN DIFFICULT TO DISTINGUISH BTWN. COMPLACENCY ON BEHALF OF THE B737. LACK OF MONITORING BTWN GND CTL AND TWR. LACK OF MONITORING BTWN GND CTL AND TAXIING ACFT.

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.