Narrative:

After receiving takeoff clearance from phl tower on runway 9L, the takeoff was aborted when an air carrier X B757 taxied onto the runway at taxiway north. Phl airport confign was converging ILS approachs to runway 9R and runway 17. Runway 9R was closed for snow removal. Arrs on the converging ILS runway 9R were sidestepping to land on runway 9L. ATIS was reporting winds 080 degrees at 5 KTS, 9 mi visibility in light snow. Because of the abort,' flow' to runway 9L was stopped, resulting in 2 dhc-8 aircraft landing on runway 9L to break off their approachs and circle to land on runway 17. After the B757 crossed and cleared runway 9L, phl tower reclred us for takeoff. I can only speculate that all ground control cleared the B757 across runway 9L and did not coordinate with phl local control. Had the WX conditions been lower, this incident might have met with disastrous results.

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Original NASA ASRS Text

Title: FLC OF A DHC-8 ABORTED TKOF DUE TO OBSERVING A B757 TAXIING ONTO THE RWY AT AN INTXN.

Narrative: AFTER RECEIVING TKOF CLRNC FROM PHL TWR ON RWY 9L, THE TKOF WAS ABORTED WHEN AN ACR X B757 TAXIED ONTO THE RWY AT TXWY N. PHL ARPT CONFIGN WAS CONVERGING ILS APCHS TO RWY 9R AND RWY 17. RWY 9R WAS CLOSED FOR SNOW REMOVAL. ARRS ON THE CONVERGING ILS RWY 9R WERE SIDESTEPPING TO LAND ON RWY 9L. ATIS WAS RPTING WINDS 080 DEGS AT 5 KTS, 9 MI VISIBILITY IN LIGHT SNOW. BECAUSE OF THE ABORT,' FLOW' TO RWY 9L WAS STOPPED, RESULTING IN 2 DHC-8 ACFT LNDG ON RWY 9L TO BREAK OFF THEIR APCHS AND CIRCLE TO LAND ON RWY 17. AFTER THE B757 CROSSED AND CLRED RWY 9L, PHL TWR RECLRED US FOR TKOF. I CAN ONLY SPECULATE THAT ALL GND CTL CLRED THE B757 ACROSS RWY 9L AND DID NOT COORDINATE WITH PHL LCL CTL. HAD THE WX CONDITIONS BEEN LOWER, THIS INCIDENT MIGHT HAVE MET WITH DISASTROUS RESULTS.

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.