Instructor with spi taxies across active runway with aircraft taking off believing he had clearance....

Attributes
ACN	332630
Time
Date	199604
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dab
State Reference	FL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	ground other : taxi
Flight Plan	VFR
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : commercial pilot : cfi
Experience	flight time last 90 days : 115 flight time total : 380 flight time type : 150
ASRS Report	332630
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : student
Events
Anomaly	conflict : ground critical incursion : runway non adherence : clearance
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While holding short of runway 7L on taxiway east, headed back to the ramp, I believed to be cleared to cross the active runway. I acknowledged ground control and began to taxi across, giving way to the opposite direction traffic. I soon noticed that the other aircraft were still holding short and that an aircraft had just taken off. I immediately taxied clear of the runway and awaited further taxi instructions. The opposite direction traffic also appeared to be confused and had asked ground control if they were cleared to cross. All traffic was instructed to hold short momentarily followed by clrncs to continue taxi. In retrospect, I believe that it is possible that, in fact, I may have not actually been cleared to cross runway 7L. Although, at the time of the occurrence, I was certain to be cleared! Contributing factors: while holding, was debriefing student on performance. This obviously interfered with my ability to hear ATC. Did not see aircraft taking off because I was watching the opposite direction traffic on the same taxiway. Due to the many aircraft transmitting on ground control, I believe my acknowledgement to ATC was merely 'roger' instead of 'crossing runway 7L.'

Original NASA ASRS Text

Title: INSTRUCTOR WITH SPI TAXIES ACROSS ACTIVE RWY WITH ACFT TAKING OFF BELIEVING HE HAD CLRNC. HE DID NOT.

Narrative: WHILE HOLDING SHORT OF RWY 7L ON TXWY E, HEADED BACK TO THE RAMP, I BELIEVED TO BE CLRED TO CROSS THE ACTIVE RWY. I ACKNOWLEDGED GND CTL AND BEGAN TO TAXI ACROSS, GIVING WAY TO THE OPPOSITE DIRECTION TFC. I SOON NOTICED THAT THE OTHER ACFT WERE STILL HOLDING SHORT AND THAT AN ACFT HAD JUST TAKEN OFF. I IMMEDIATELY TAXIED CLR OF THE RWY AND AWAITED FURTHER TAXI INSTRUCTIONS. THE OPPOSITE DIRECTION TFC ALSO APPEARED TO BE CONFUSED AND HAD ASKED GND CTL IF THEY WERE CLRED TO CROSS. ALL TFC WAS INSTRUCTED TO HOLD SHORT MOMENTARILY FOLLOWED BY CLRNCS TO CONTINUE TAXI. IN RETROSPECT, I BELIEVE THAT IT IS POSSIBLE THAT, IN FACT, I MAY HAVE NOT ACTUALLY BEEN CLRED TO CROSS RWY 7L. ALTHOUGH, AT THE TIME OF THE OCCURRENCE, I WAS CERTAIN TO BE CLRED! CONTRIBUTING FACTORS: WHILE HOLDING, WAS DEBRIEFING STUDENT ON PERFORMANCE. THIS OBVIOUSLY INTERFERED WITH MY ABILITY TO HEAR ATC. DID NOT SEE ACFT TAKING OFF BECAUSE I WAS WATCHING THE OPPOSITE DIRECTION TFC ON THE SAME TXWY. DUE TO THE MANY ACFT XMITTING ON GND CTL, I BELIEVE MY ACKNOWLEDGEMENT TO ATC WAS MERELY 'ROGER' INSTEAD OF 'XING RWY 7L.'

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.

Instructor with spi taxies across active runway with aircraft taking off believing he had clearance. He did not.