Narrative:

Initially; the event was determined to be a pilot deviation at the facility level. Washington headquarters determined the event to be controller error. Aircraft X; an LR25; landed runway 9R. The controller instructed aircraft X to hold short runway 9L at taxiway M. Aircraft X read back 'runway 9L; taxiway M.' the controller cleared air carrier Y; a B757; for takeoff runway 9L. The controller observed aircraft X taxiing at a standard rate. It appeared to the controller; that aircraft X was not going to comply with the hold short instructions. The controller again issued hold short instructions to aircraft X at runway 9L; taxiway M. The controller canceled takeoff clearance for air carrier Y for which air carrier Y acknowledges. Aircraft X advises the controller he is not on the runway. Approximately 20 seconds after the takeoff clearance was canceled for air carrier Y. The amass alerts; aircraft X is not on the runway; however; the aircraft is past the hold line. Air carrier Y exits runway 9L at taxiway north; upfield of aircraft X; and short of taxiway M. Washington headquarters interpretation/explanation for controller error is due to the pilot of aircraft X; not reading back the hold short instructions verbatim and the controller not catching the readback.

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Original NASA ASRS Text

Title: AN INITIAL PLTDEV DETERMINATION WAS CHANGED TO AN OPERROR AT PHL WHEN TKOF WAS ABORTED BY CTLR BECAUSE OF POSSIBLE RWY INCURSION BY TAXIING ACFT; AMASS ALERTED.

Narrative: INITIALLY; THE EVENT WAS DETERMINED TO BE A PLTDEV AT THE FACILITY LEVEL. WASHINGTON HEADQUARTERS DETERMINED THE EVENT TO BE CTLR ERROR. ACFT X; AN LR25; LANDED RWY 9R. THE CTLR INSTRUCTED ACFT X TO HOLD SHORT RWY 9L AT TXWY M. ACFT X READ BACK 'RWY 9L; TXWY M.' THE CTLR CLRED ACR Y; A B757; FOR TKOF RWY 9L. THE CTLR OBSERVED ACFT X TAXIING AT A STANDARD RATE. IT APPEARED TO THE CTLR; THAT ACFT X WAS NOT GOING TO COMPLY WITH THE HOLD SHORT INSTRUCTIONS. THE CTLR AGAIN ISSUED HOLD SHORT INSTRUCTIONS TO ACFT X AT RWY 9L; TXWY M. THE CTLR CANCELED TKOF CLRNC FOR ACR Y FOR WHICH ACR Y ACKNOWLEDGES. ACFT X ADVISES THE CTLR HE IS NOT ON THE RWY. APPROX 20 SECONDS AFTER THE TKOF CLRNC WAS CANCELED FOR ACR Y. THE AMASS ALERTS; ACFT X IS NOT ON THE RWY; HOWEVER; THE ACFT IS PAST THE HOLD LINE. ACR Y EXITS RWY 9L AT TXWY N; UPFIELD OF ACFT X; AND SHORT OF TXWY M. WASHINGTON HEADQUARTERS INTERP/EXPLANATION FOR CTLR ERROR IS DUE TO THE PLT OF ACFT X; NOT READING BACK THE HOLD SHORT INSTRUCTIONS VERBATIM AND THE CTLR NOT CATCHING THE READBACK.

Data retrieved from NASA's ASRS site as of January 2009 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.