An ord local controller and a landing flight crewmember describe a loss of separation event that occ...

Narrative:

Landing runway 22R; departing runway 9R. Crossed my departure runway with two aircraft from the FBO and when ground asked me to take them to a different runway for departure; taxied aircraft to my departure runway to hold short of landing runway 22R. An E145 was cleared to land; departed runway 9R then crossed previous landing traffic. Instructions were issued for another aircraft to enter runway 22R to exit on taxiway west. I had an aircraft working a maintenance issue that was blocking taxiway H so I could not taxi the aircraft straight across on taxiway H. Forgot the landing traffic when I allowed the taxiing aircraft to enter the runway. I was looking for where the taxiing aircraft would be sequenced into the departure line. Another controller told me that the arrival was crossing threshold with the taxiing aircraft on the runway. It was too late to send the landing traffic around. Asde-X did not alert that there was an aircraft on the runway. I should have crossed the departing aircraft and switched them back to ground control to work them. I shouldn't allow myself to be distracted worrying about a sequence when crossing an active runway.

Original NASA ASRS Text

Title: An ORD Local Controller and a landing flight crewmember describe a loss of separation event that occurred when ATC allowed a landing with traffic on the runway. Both reporters indicated a last minute go around would not have been as safe.

Narrative: Landing Runway 22R; departing Runway 9R. Crossed my departure runway with two aircraft from the FBO and when Ground asked me to take them to a different runway for departure; taxied aircraft to my departure runway to hold short of landing Runway 22R. An E145 was cleared to land; departed Runway 9R then crossed previous landing traffic. Instructions were issued for another aircraft to enter Runway 22R to exit on Taxiway W. I had an aircraft working a maintenance issue that was blocking Taxiway H so I could not taxi the aircraft straight across on Taxiway H. Forgot the landing traffic when I allowed the taxiing aircraft to enter the runway. I was looking for where the taxiing aircraft would be sequenced into the departure line. Another controller told me that the arrival was crossing threshold with the taxiing aircraft on the runway. It was too late to send the landing traffic around. ASDE-X did not alert that there was an aircraft on the runway. I should have crossed the departing aircraft and switched them back to Ground Control to work them. I shouldn't allow myself to be distracted worrying about a sequence when crossing an active runway.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	892331
Time
Date	201006
Local Time Of Day	0601-1200
Place
Locale Reference	ORD.Tower
State Reference	IL
Environment
Light	Daylight
Aircraft 1
Make Model Name	EMB ERJ 145 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	Landing
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Person 2
Function	Captain Pilot Not Flying
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy

An ord local controller and a landing flight crewmember describe a loss of separation event that occurred when ATC allowed a landing with traffic on the runway. Both reporters indicated a last minute go around would not have been as safe.